Date   

BITX 40 for sale

Bruce Bjerke, K7BHB <bruce.k7bhb@...>
 

Selling my BITX40 to raise sheckles for another rig. The unit operates perfectly, and gets good reports from the Noon-Time Net here in the Pacific Northwest. Equipped with the Baofeng speaker-mic, receive audio currently wired to a 2" speaker. Attractively cased in a clear plastic box with easy access to the internals. I'm running Allard's V1.26 with the frequency range set to 7.125 - 7.300 KHz., and shuttle tuning rate set well down. I've installed a fine tuning control and function button.
Includes a spare unused 2-line LCD module. The rig is suitable for an appliance operator or for someone wanting to pursue further modification and programming. Photos upon request. Selling for $99.00 shipped USPS Priority Mail. Contact me through the Board, or at bruce dot k7bhb at gmail dot com.


Re: Software support Request for Full QSK BITX40

Gary O'Neil
 

Oh my...

Pretty much the responses I’ve anticipated... 

Nothing should be considered ready for prime time... 1uF caps are big... They exacerbate problems you want (might want) to investigate in simulation. Perform a transient analysis of the mic amp as an example, and you will get a clear (visual) picture of the T/R transition noise far beyond when the relays stop their chatter. Making the capacitors too small is another way to stress circuit performance. 

The 2N7002 is included in the LTSpice library... I have a healthy stash of 2N7000’s... close enough for feasibility testing.  May or may not be the device of choice. That said, preliminary testing at 20W CW survived a 5:1 mismatch, and output to the receiver was insufficient to bias the protection diodes... of which only one would fully protect the front end... Can you guess why? I think the configuration shown is close to the prototype I tested... I don’t have my most recent configuration/data yet documented, but my prototype measurements were something like 0.2 dB insertion loss and 45 dB isolation (simulated) >50 dB (measured). Actual isolation improves as the match improves... i.e. >50 dB was measured when the match was 1:1.

The transmitter impedance can be 50 ohms or infinity, but as configured is likely closer to 50 ohms. In either case, the antenna is tuned to the system (combined) impedance. MDS sensitivity remains below 0.1 uV, and Transmit output power is unaltered. 

This is not a radio redesign, but rather a make best of what I’ve been given. A redesign is on my radar however, that eliminates three of the 6 IF amp stages, the two on board oscillators, and at least one audio stage. A board relayout, some novel switching, 
Some filter improvements, and possibly trying to integrate Wes’s bidirectional amp scheme into the design. 

I could answer to all of the obvious and not so obvious questions and go off in other directions, but my intent is to make the as is design work with Allard’s feature rich software in its most favorable manner. I think it could result in a really decent radio at its price point... Assuming builders don’t have to achieve it on a second or third pass. 

Ill post where here this ends up, but once Allard has his code supporting Full QSK, I’ll likely go radio silent again until I reach another hurdle, or I actually achieve the result I’m after that’s sufficiently robust that I can suggest it to others without reservation.

72

Gary, N3GO


Re: SMD Group Build

William R Maxwell
 

They have, Jack. Well, sort of but you would have to adopt my favourite 0805 size. See eBay item

131871397971

A good assortment and at a good price. So good that any mark up in the price must be very small. In fact at that price, each of your club members should be encouraged to buy in a pack each. That way they would have enough for your smd introductory project board and then heaps left over for future projects.

Bill, VK7MX


On 25/01/2018 4:23 PM, Jack Purdu
m via Groups.Io wrote:
I wish someone would put together an assortment of, say, 40 common values, quantity 100 of each value and market it for some reasonable markup for resistors and caps. For the club build, I'd prefer 1206 since this is a huge step for some of the club members.

BTW, today I just got 40 clear plastic 1.25"x0.75" cosmetic sample jars (eBay #332506418787). Tomorrow I'm going to Target and buy Velcro sticky tape "dots" and place one half on the bottom of the jar, and the other on a piece of plywood which hangs on the wall. Now if somebody has an assortment of 40 common values, they go into the jar and I'm ready to go. Each jar will have a small Avery label on it.

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:09 AM
Subject: Re: [BITX20] SMD Group Build

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?




Re: SMD Group Build

Diver Martin <diver.martin@...>
 

'capacitor kit 1206' -- Though, I must say... pictures are of resistors... which kinda weirds me out.  But hey, they're a few bux...  What also gives me the jibblies is there's no material spec (x7r/NP0/etc), nor voltage on these kits....


Cheers,
Martin

On Wed, Jan 24, 2018 at 9:36 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I just ordered two of the "middle" one. I thought I had checked eBay several months ago...must have missed these. Now...off to look for caps!

Thanks, Diver!!

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:29 AM

Subject: Re: [BITX20] SMD Group Build


On Wed, Jan 24, 2018 at 9:23 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I wish someone would put together an assortment of, say, 40 common values, quantity 100 of each value and market it for some reasonable markup for resistors and caps. For the club build, I'd prefer 1206 since this is a huge step for some of the club members.

BTW, today I just got 40 clear plastic 1.25"x0.75" cosmetic sample jars (eBay #332506418787). Tomorrow I'm going to Target and buy Velcro sticky tape "dots" and place one half on the bottom of the jar, and the other on a piece of plywood which hangs on the wall. Now if somebody has an assortment of 40 common values, they go into the jar and I'm ready to go. Each jar will have a small Avery label on it.

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:09 AM

Subject: Re: [BITX20] SMD Group Build

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
------------------------------ ------------------------------ -------------------
If there aren't any questions, then what is there to learn?





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?


Re: Almost all of the firmware has been modified to fix known bugs and enhance CAT communications.

Ian Lee
 

You have a lot of experience with NTP servers using GPS. Excellent!
I just needed a solution because the USB sound card was too big. So I decided to remove the USB connector from the RPI and insert the sound card.
(I wanted to put the WSJT-X Portable in my pocket.)

But the USB connector was double type. So I thought I should put one more thing. At that time, the USB type GPS was shown! So the GPS module is located like that.
I have no experience with PPS. so I do not know if that GPS module supports PPS.
Synchronizing the time with the NMEA protocol is something that we have done before.
By the way, your email has motivated me to study something more.

Ian KD8CEC 


2018-01-25 2:28 GMT+09:00 <al_91dak@...>:

Cool! Did you hook up the PPS line? That would allow for time synchronization that far exceeds what is necessary for these modes, but might as well do it anyway as it is just one GPIO...
I have a Raspberry Pi based NTP server on my home network that uses the GPS+PPS method, been rock solid for years now. This also brings up other thoughts like automatically setting the gridsquare in WSJT-X.



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)


Re: SMD Group Build

Diver Martin <diver.martin@...>
 

Another option would be to make the kits yourself, if you wanted to market them to your club.  Use E3 resistor values (explanation here, http://www.radio-electronics.com/info/data/resistor/e-series-e3-e6-e12-e24-e48-e96.php), with basically from 1 ohm up to 1M ohm of values 1.0, 2.2 and 4.7 (So 1.0 ohms, 2.2 ohms, 4.7 ohms, 10 ohms, 22 ohms, 47 ohms, 100 ohms, etc).  Account for 7 ranges, that's 21 values.

Caps, I'd do E6 in the ranges from 10p to 100nF (5 ranges, 6 per range = 30), and then 1uF, 4.7uF, and 10uF electrolytics at 50V a pop, roughly.  If you want to build 50 kits, using the 1k 1206 as a reference, it's $16 per reel of 5000 parts (50 kits x 100 pcs per kit).  That's $0.32 per value.  21 values in resistors, 30 values in caps, and 3 values in electrolytics, you can make a pretty good kit.  The resistors would only cost you $6 per kit with 100 parts per value.

The problem with caps is that you have multiple factors / degrees of freedom.  1) Value, naturally, about 30 values would get you there 2) Material.  X7R?  NP0?  Electrolytic?  Tantalum? Some are good for RF, some are horribad, but great for bypassing power supplies.  I generally have NP0 below 1000p, and X7R above, though I do have some 10nF NP0's for specific applications 3) Voltage.  Higher voltage = larger capacitor = more material = more cost.  You don't want to spec 30 values all at 1kV, but 50V might not be good enough for all applications.  My tuner though uses 1kV NP0 caps.

I would generally say 50V is usually useful for most low power and filtering applications though, so 10->1000p @ NP0, 50V, 1000p -> 100nF @ 50V X7R.

On Wed, Jan 24, 2018 at 9:29 PM, Martin Held <diver.martin@...> wrote:

On Wed, Jan 24, 2018 at 9:23 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I wish someone would put together an assortment of, say, 40 common values, quantity 100 of each value and market it for some reasonable markup for resistors and caps. For the club build, I'd prefer 1206 since this is a huge step for some of the club members.

BTW, today I just got 40 clear plastic 1.25"x0.75" cosmetic sample jars (eBay #332506418787). Tomorrow I'm going to Target and buy Velcro sticky tape "dots" and place one half on the bottom of the jar, and the other on a piece of plywood which hangs on the wall. Now if somebody has an assortment of 40 common values, they go into the jar and I'm ready to go. Each jar will have a small Avery label on it.

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:09 AM

Subject: Re: [BITX20] SMD Group Build

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?



--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?


Re: SMD Group Build

Jack, W8TEE
 

I just ordered two of the "middle" one. I thought I had checked eBay several months ago...must have missed these. Now...off to look for caps!

Thanks, Diver!!

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:29 AM
Subject: Re: [BITX20] SMD Group Build


On Wed, Jan 24, 2018 at 9:23 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I wish someone would put together an assortment of, say, 40 common values, quantity 100 of each value and market it for some reasonable markup for resistors and caps. For the club build, I'd prefer 1206 since this is a huge step for some of the club members.

BTW, today I just got 40 clear plastic 1.25"x0.75" cosmetic sample jars (eBay #332506418787). Tomorrow I'm going to Target and buy Velcro sticky tape "dots" and place one half on the bottom of the jar, and the other on a piece of plywood which hangs on the wall. Now if somebody has an assortment of 40 common values, they go into the jar and I'm ready to go. Each jar will have a small Avery label on it.

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:09 AM

Subject: Re: [BITX20] SMD Group Build

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
------------------------------ ------------------------------ -------------------
If there aren't any questions, then what is there to learn?





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?



Re: SMD Group Build

Diver Martin <diver.martin@...>
 

On Wed, Jan 24, 2018 at 9:23 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I wish someone would put together an assortment of, say, 40 common values, quantity 100 of each value and market it for some reasonable markup for resistors and caps. For the club build, I'd prefer 1206 since this is a huge step for some of the club members.

BTW, today I just got 40 clear plastic 1.25"x0.75" cosmetic sample jars (eBay #332506418787). Tomorrow I'm going to Target and buy Velcro sticky tape "dots" and place one half on the bottom of the jar, and the other on a piece of plywood which hangs on the wall. Now if somebody has an assortment of 40 common values, they go into the jar and I'm ready to go. Each jar will have a small Avery label on it.

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:09 AM

Subject: Re: [BITX20] SMD Group Build

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?


Re: SMD Group Build

Jack, W8TEE
 

I wish someone would put together an assortment of, say, 40 common values, quantity 100 of each value and market it for some reasonable markup for resistors and caps. For the club build, I'd prefer 1206 since this is a huge step for some of the club members.

BTW, today I just got 40 clear plastic 1.25"x0.75" cosmetic sample jars (eBay #332506418787). Tomorrow I'm going to Target and buy Velcro sticky tape "dots" and place one half on the bottom of the jar, and the other on a piece of plywood which hangs on the wall. Now if somebody has an assortment of 40 common values, they go into the jar and I'm ready to go. Each jar will have a small Avery label on it.

Jack, W8TEE



From: Diver Martin <diver.martin@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:09 AM
Subject: Re: [BITX20] SMD Group Build

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?



Re: uBitx TX performance with frequency

Ashhar Farhan
 

You can increase drive with the preset of the predriver.
- f

On 24 Jan 2018 6:24 pm, "KD8CGH" <rkayakr@...> wrote:
I took some time to measure the actual performance of my uBitx with its original calibration against a dummy load. The instruments used are not lab calibrated. I did check my wattmeter against my recently factory calibrated K3 and found the power reported to be about 5% high. The power supply is rated as 25 amps and set at 13.7 volts. I tested by simply pressing the PTT (no audio input, power out 0) and keying CW.
Receive current: .25 A

  PTT CW CW
f kHz I amp I amp P watt
3,530 0.74 1.8 8
3,970 0.74 2.1 9
7,030 0.73 1.57 5
7,270 0.7 1.6 5
10,113 0.72 1.22 3
14,030 0.71 1.34 3
14,320 0.71 1.37 3
21,170 0.69 0.96 1
28,900 0.69 0.83 0.5

The results agreed in general with Dave's (WI6R) post https://groups.io/g/BITX20/message/39578, although his results start a bit higher and end even lower.
Although my current draw with PTT down agrees with the value specified on the Tune-up page, I never quite see 10 watts out. The 80 meter power isn't too bad, but the 14 MHz is half and 28 MHz is 1/4 of that mentioned on the uBitx web page.

What TX performance have others seen?
Any fixes for higher frequencies?

     Bob   KD8CGH


Re: Oscilloscope for Beginners - A story

Ashhar Farhan
 

There is a very strong connection of ham radio and tek. Many of our heros are alumni of tek. They invented many things. I found out they invented the tunnel diode, made their own devices, displays.
- f

On 24 Jan 2018 11:10 pm, "Michael Hagen" <motdog@...> wrote:

The Rigol I got had about 17 hrs. on the meter.  It still was running all the options they turn off after 30 Hrs.


Then they want you to pay!

At the time they were $299 new, I bid $260 on eBay.  What a deal, and you get 4 new probes!  No tax and just a little shipping.

There are tons of information out there on the DS1054Z.    Lots of reviews.  Only big complaints are too much on the screen and it is very small.  The encoders have small knobs, and you have to push just right or the encoder might move?  There is a hack out in the wild to change the options yourself, so you get 100 Mhz and special triggering functions, and deep memory.   You do it at your own risk.  You can find info on lots of sites.  I doubt if their newer models have this "feature"?

I just wish it was a little bigger.  I hope it stays working now that I am bragging about it!

I really hated my $65 PC connected scope mentioned to start this thread.  Hantek had NO support and no Firmware

updates.  I had to carry a big 600V 1uf cap to AC couple it.  The triggering options were very minimal.

Like you I really like Real Analog scopes, but their day is gone.

73's

Mike, WA6ISP

https://www.ebay.com/itm/Rigol-DS1054Z-Digital-Oscilloscopes-Bandwidth-50-Mhz-Channels-4/331941742120?epid=2254681137&hash=item4d49450628:g:EHYAAOSwUoNaA4By


On 1/24/2018 9:12 AM, Jerry Gaffke via Groups.Io wrote:
I've always had a soft spot for a good analog scope,
and John's post had me prowling around ebay some.
Anything moderately cheap is "parts only", refurbished you spend about
as much as you would for a new Rigol.

Unless you get a really good deal on one you know works,
I can't recommend an old used scope to the typical hobbyist.
Fixing those old scopes with all their custom parts can be non-trivial.

Jerry, KE7ER 


On Wed, Jan 24, 2018 at 08:24 am, Michael Hagen wrote:

So, I gave up, if it is not a simple fix, they seemed to consume all my time.

 


-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...


Re: SMD Group Build

Diver Martin <diver.martin@...>
 

I've found it's never worth it for me to etch my own PCB's.  Ferric chloride, and all those other etchants, blech.  And, a total lack of vias and soldermask, no thanks....

On Wed, Jan 24, 2018 at 9:10 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
Do you feel that is easier than, say, doing a Muppet board and etching it yourself?
Jack, W8TEE


From: Ashhar Farhan <farhanbox@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:04 AM

Subject: Re: [BITX20] SMD Group Build

I use double side, plain copper clad. Then, with a sharp knife (i use a glass cutter), i score off an island of 3x2 to 5x2 squares of about 0.25inch to a side. I use all around for the ground plane, and solder the 1206 betweeb the pads. The sot23 transistors are soldered at a corner of three squares. If the ground planing ia crucial, i drill a number of holes around the top ground plane and solder small pieces of wire to connect to the Bottom ground

On 25 Jan 2018 10:24 am, "William R Maxwell" <wrmaxwell@...> wrote:
0805 is a happy medium.
Bill, VK7MX

On 25/01/2018 3:20 PM, Jack Purdum via Groups.Io wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.









--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?


Re: #ubitx and 6 meters #ubitx

Tom Christian
 

Thanks, Bill!  I'll be anxious to hear what you find.  I sure will be glad when my ubitx finally shows up so I can join the fun for real....:)
Tom
AB7WT


Re: Oscilloscope for Beginners

Ashhar Farhan
 

The rigol ds1052e is very good for general use. I can see upto 200 mhz on it. Works well, it has a nominal spectrum analyzer too.
- f

On 24 Jan 2018 10:29 pm, "Goran VE6GPO" <goran.poprzen@...> wrote:
Found this long time ago at http://www.audiokarma.org/forums/showthread.php?t=35392
Enjoy!!!
==================================================
Hot Rod Oscilloscope   
by Dennis L. Feucht
 
With apologies to the '60s hit tune, "Hot Rod Lincoln"
 
You've heard the story of the bandwidth race,
Where 'scopes and counters were setting the pace;
Well that story is true, I'm here to say;
I was using a 545A.
 
It's got a graticule, all lit up,
That front-panel claptrap makes it look tough.
It's got plug-ins, uses 'em all;
It's got good risetime, and also fall.
 
With a dual-trace display at reasonable cost,
And forty-eleven knobs, you can really get lost;
It's got a dual-delayed timebase, but I ain't scared,
The trace is sharp; the probes are fair.
 
Pulled out a new project late one night,
The test equipment was burning bright,
I started driving a wideband amp,
To see which stage I needed to damp.
 
When all of a sudden in the blink of an eye,
A series of waveforms passed me by,
And I said, "Wow, that's a marvel to me!"
Pretty soon a square-wave was all I could see.
 
Now the boss was ribbing me for being behind,
So I thought I'd make the probes unwind,
Took the volts per div knob, and man alive!
I turned it up to a setting of 5.
 
Powered the wideband amp again,
And drove it with a function gen,
Set the amplitude knob to three or four,
The levels were hitting the ceiling and floor.
 
Now the transient response made no sense,
The scope display looked like a picket fence.
I slowed it down and was glad to know,
That it wouldn't alias like a DSO.
 
I tweaked the circuit here and there,
Replaced a cap and transistor pair;
Got the speed I needed with room to go;
Manufacturing would be glad to know.
 
Smoke was coming from out of the load
When I set the trigger to hf mode;
The power bandwidth was looking right;
Nearly approaching the speed of light.
 
The task was finished, the specs first-rate,
The customers called, said the amp worked great;
I got a promotion, moved out of L.A.,
And I credit success to that '45A!
 
======================================



Re: SMD Group Build

Jack, W8TEE
 

Do you feel that is easier than, say, doing a Muppet board and etching it yourself?
Jack, W8TEE


From: Ashhar Farhan <farhanbox@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 12:04 AM
Subject: Re: [BITX20] SMD Group Build

I use double side, plain copper clad. Then, with a sharp knife (i use a glass cutter), i score off an island of 3x2 to 5x2 squares of about 0.25inch to a side. I use all around for the ground plane, and solder the 1206 betweeb the pads. The sot23 transistors are soldered at a corner of three squares. If the ground planing ia crucial, i drill a number of holes around the top ground plane and solder small pieces of wire to connect to the Bottom ground

On 25 Jan 2018 10:24 am, "William R Maxwell" <wrmaxwell@...> wrote:
0805 is a happy medium.
Bill, VK7MX

On 25/01/2018 3:20 PM, Jack Purdum via Groups.Io wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.







Re: SMD Group Build

Diver Martin <diver.martin@...>
 

Jack,

Just as a point of reference:  Going for 5% tolerance 1k ohm resistors, and buying 1000 at a time, a quick search on digikey gives me:

1000x 0603 resistors:  $2.07
1000x 0805 resistors:  $3.03
1000x 1206 resistors:  $4.63

For reference
1000x axial TH resistors: $7.29.

At a half penny a pop, the cost of 1206 vs 0603 I'm betting isn't going to be a noticable difference.  (At 100qty, they're about 2x as much, ~$0.01 each, or $1 for 100).  You can really sneeze hard and not loose a lot of money.



On Wed, Jan 24, 2018 at 8:20 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?


Re: SMD Group Build

Jack, W8TEE
 

It looks more like a happy grain of salt to me! I have very little experience myself with SMD's, but they don't scare me anymore. Perhaps a partial reason is because I can't see most of them...

Jack, W8TEE


From: William R Maxwell <wrmaxwell@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 11:54 PM
Subject: Re: [BITX20] SMD Group Build

0805 is a happy medium.
Bill, VK7MX

On 25/01/2018 3:20 PM, Jack Purdum via Groups.Io wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.






Re: SMD Group Build

Ashhar Farhan
 

I use double side, plain copper clad. Then, with a sharp knife (i use a glass cutter), i score off an island of 3x2 to 5x2 squares of about 0.25inch to a side. I use all around for the ground plane, and solder the 1206 betweeb the pads. The sot23 transistors are soldered at a corner of three squares. If the ground planing ia crucial, i drill a number of holes around the top ground plane and solder small pieces of wire to connect to the Bottom ground

On 25 Jan 2018 10:24 am, "William R Maxwell" <wrmaxwell@...> wrote:

0805 is a happy medium.

Bill, VK7MX


On 25/01/2018 3:20 PM, Jack Purdum via Groups.Io wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.





Re: SMD Group Build

William R Maxwell
 

0805 is a happy medium.

Bill, VK7MX


On 25/01/2018 3:20 PM, Jack Purdum via Groups.Io wrote:
I can barely see a 0603! I would prefer 1206 if I can find them and am not too worried about the cost differential.
Jack, W8TEE


From: Clark Martin <kk6isp@...>
To: BITX20@groups.io
Sent: Wednesday, January 24, 2018 9:15 PM
Subject: Re: [BITX20] SMD Group Build


Clark Martin
KK6ISP

On Jan 24, 2018, at 5:56 PM, Diver Martin <diver.martin@...> wrote:

Mouser & Digikey are my go-to for SMT parts.  They carry just about everything.  If you have other oddball SMT stuff, and either one are out, head to findchips.com.  There are alternate suppliers, but those two always have what I need, either in the exact specified part number, or an equivalent.  Other places will source 1206's and stuff, but might only sell by the full reel (which I have yet to need, except maybe 0.01uF caps or 0.1uF caps across multiple, multiple projects).

SMD resistors/caps (0603, 5% in my case) are usually cheap enough that I buy them in 1000-piece quantity, because $2 of parts for life or $0.5 for the parts I need for the project, and to always have them on hand, is easy.


I’ve only bought from Digikey a few times but I use Mouser all the time.  Also there are Newark and Allied for such supplies.

I bought a set of 0805 resistors (from 0 ohm through several Mohms) and a set of 0805 caps (10s of pF through 1µF).  They came on cards that fit a day planner binder.  There are between 1 and four strips of 25 each for each value (depending on expected usage levels).  I have little trouble working with 0805 parts and they  fit nicely on .1” grid perfboard (with plated through holes).  

When I use up a strip I buy a new strip of 25 at a local electronics shop (Silicon Valley still has a few).

I haven’t done any PCB fabricating yet but that is in the plans.

SMD diodes and transistors of most any size are easily soldered to perfboard.

I’ve also soldered up to 8 pin SOICss buy putting alternate pins on the perfboard pads and tack soldering leads to the other pins.

It definitely makes for smaller boards.




Re: BitX40 voltage booster implementation

AA9GG
 

That's the same one I use Mike.....

--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
NAQCC 3123, SKCC 4628