Date   
Re: Variable power control

Walter
 

Thank you very much.

I have ordered the parts and will build this to add to my ubitx.

I think this will supply power to the PA power wire on the power connector.  Is this correct?

Do I need to do anything with RV1?

I will have my Watt/SWR meter on the ubitx so I will know what my actual power output is.

Would you be able to post an PDF or Jpeg of your print?  The print on this blog is not very clear.

I very much appreciate your help.

73, W9KJO, Walter

Re: More pins for the Raduino! An RF gain control for the uBITX!

VE7WQ <v@...>
 

Thank you Don,

your blog is a treasure trove, you are a fine artist as well.

The last time I saw an illustration like this, was in a 19th century sciense book:

Question: how can I make up a 50 Ohm 10W dummy load, 

for the B40 out of easily available resistors? 

The store don't have 50 Ohm 10W or 2x 100 Ohm 5W resistors here.


73! George

VE7WQ


Wednesday, February 21, 2018, you wrote:

www.ND6T.comhttp://www.ND6T.com

DCvGI> More to come.

DCvGI> Have fun!

DCvGI> -Don, ND6T

Re: RD16HHF1 in the uBITX #ubitx

RCBoatGuy
 

BTW, could we keep this thread focused on using the RD16HHF1 discussion and move the SMD/SMT discussion to a new thread?

Thanks for the great measurements on the pre-drivers, Glenn.  Makes it clear the IRF510s aren't the only problem, which corroborates Jerry's excellent LTSpice work.

Allison, you are quite correct.  RD16HHF1 vs IRF510 is more a personal preference for me; both will certainly work well with the right changes.  I agree that redesigning the pre-drivers and finals is the best way to go to get flatter gain across the bands whether using the RD16HHF1 or the IRF510.  Personally, I'm OK with replacing everything from C80 to KT1 pin12 in my uBitX, but I understand that others may want a simpler solution.  That's the beauty of having an open design you can tinker with.  What changes would you recommend to the transformers, and what transistor would you recommend for the pre-drivers to get flatter gain across the 1.8Mhz - 50MHz range?

Thanks,

Carl, K0MWC

Re: Variable power control

Nick VK4PP
 

What about replacing RV1 with an AD5246, and an SWR bridge to monitor output power and then a PID loop to adjust drive level to attain desired output...

Re: RD16HHF1 in the uBITX #ubitx

Jerry Gaffke
 

Allison, thanks for the insights.
Much appreciated.

I noticed that the push-pull IRF510's performed much better in simulation using the WA2EBY
output transformer scheme  than with the stock uBitx output transformer. 
Is that the "simplified transformers" you refer to?
Or do you suspect the uBitx has significant trouble in how it drives the IRF510 gates?

My simulation showed that both the WA2EBY and uBitx loaded down the 4x2n3904 driver
with about 12 ohms at 30mhz (still in phase on the WA2EBY, as I vaguely recall).
Rather surprising, but perhaps that was due in part to the simulation using worst case IRF510 spec's?

Any suggestions on how best to pick up gain in the driver and predriver, 
perhaps swap in a different transistor?
We've got lots of uBitx's out in the wild now, and would be nice to have an easy hack.

Jerry, KE7ER


On Wed, Feb 21, 2018 at 03:19 pm, ajparent1 wrote:
The problem is the amplifier has matching issues from simplified transformers.  Additionally 
at 30mhz the AC  gain of the driver and predriver transistors (2n3904) is about 10 as compared
to an AC gain of 20 at 14mhz. So you seeing two problem one of driver that diminishes with
frequency and matching that is less than optimum with increasing frequency. 

Re: Variable power control

LKNDAVE
 

SUBTRACT A FEW PARTS AND A POT AND IT IS CONSTANTLY VARIABLE ADD ASC712 TO MONITOR CURRENT AND A VOLTAGE DIVIDER TO SEE WHATs GOING WITH REALTIME DETAIL.
DAVE
Ihate caps lock

Re: rv2- messed up setting and txing like mad!!!

Jerry Gaffke
 

Doesn't matter if psu connects to ammeter black or red,
will likely read with a minus sign if you put the black ammeter probe on the PSU.

I suggest you measure PA current separately, since I think you already have a handle on the main board supply current..
Should see 0 amps with both RV2 and RV3 fully clockwise (minimum) with ptt pressed.
Then you slowly slowly turn RV2 up for 100ma, and then RV3 up for an additional 100ma.


On Wed, Feb 21, 2018 at 02:12 pm, <mm0wxt@...> wrote:
Should I be measuring pa current or both? E.g. both wires from psu to black probe and 2 wires running of red probe to each input?

Re: RD16HHF1 in the uBITX #ubitx

VE7WQ <v@...>
 

Thank you Eric,


I was soooo affraid to tackle any smd involved task until now,

but you gave me the needed insite and enouragement, 

I feel, I could do it now.


73! George

VE7WQ


Wednesday, February 21, 2018, you wrote among other things:

EK> Sometimes I'll tape a hunk of fish paper over a thru-hole I 

EK> think might not like the heat. Or I might cover a previous SMT part that 

EK> might come unsoldered and get misaligned or blown away.


EK> Eric KE6US


Re: RD16HHF1 in the uBITX #ubitx

ajparent1/kb1gmx
 

There seems to be a belief that the IRF5xx parts have no capability at VHF...

I have an amp using 8 of them at 32V that puts out a mere 210W at 50mhz.  All of the parts are
IRF510s in a 4x4 push pull arrangement!  The amps gain over all is about 13db. 

I have also built the WA2eby push-pull HF amp and that design with 2w in gives me 55W at 40M
and 37W at 29mhz, that with a 28V supply.   Also IRF510s so the part has capability though
generally if performs better at 24V.

THe bias on the IRF510 is often lower than optimum, Both amps (and other HF/6M projects)
run far more bias current that specified as it produced more power.

The problem is the amplifier has matching issues from simplified transformers.  Additionally 
at 30mhz the AC  gain of the driver and predriver transistors (2n3904) is about 10 as compared
to an AC gain of 20 at 14mhz. So you seeing two problem one of driver that diminishes with
frequency and matching that is less than optimum with increasing frequency. 

I've also built amps around the RD16HHF part and at 13V its good but it requires different
components around it to get the power out they can deliver.  For a push pull pair with adequate
drive 20W is about it.

Before I'd go for changing parts I'd insure the driver and predriver are producing enough power.
It is also possible that the particular parts are on the low sid eof spec but the design is robust enough
to absorb that.

Another thing to insure is that your DC [pwer getting to the final is really 12-14V and not suffering
excessive voltage drop due to wiring  or worse the power source fading at higher currents.

So dropping in RD16HHF1 in without changes will likely not improve matters much and it may
lead to instability.   But if you have a pair you can try. 

I'd expect more like 4W or more so something is not right.


Allison/kb1gmx

Re: #ubitx Calibration resolution #ubitx

 

I finally got my uBitx calibrated to my satisfaction but I still think there is room for some improvement there. Now waiting for my case to arrive and I can finish it up. So far very happy with it.

Joel
N6ALT

Re: Raduino Replacemnt, COMING SOON!

Nick VK4PP
 

OK Group.
Here is how it is looking: I have placed the order!
20 x RadionoI2C boards,
300 x HPF boards
300 x LPF boards
60 x Audio breakout boards.

I will build and test 2 boards: 1 for my own use (customised ect). and 1 built as a direct replacement.
Remainder of the boards will be put on ebay.
Preliminary prices in AUD:
Raduino $5
HPF $0.50
HPF $0.50
Audio breakout $1
Postage, DL Envelope:  Int $3.5, VK $1.50

Prices are higher than I had hoped, but thats due to DHL shipping from supplier.

I will do another much bigger(cheaper) run of boards once we are happy that there are no errors...

7, Nik
VK3PLN

Re: My uBitx shipped today

Gary Shriver
 

Hey Thanx Tom!

 

Pretty amazing that it gets here so quickly.  On this end the wait continues..  ordered on 1/13 so my uBitx is still at least a few weeks away.  Nice to see all the activity of people’s radios getting shipped.  Pretty much daily. 

 

Have fun!   We ought to set up a schd on 80 meters when you get it going.  Beaverton is about perfect for late afternoon / early evening between you and me here in central California.   I hear you Oregon boys every night.

 

73-Gary 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tom Christian
Sent: Wednesday, February 21, 2018 1:23 PM
To: BITX20@groups.io
Subject: Re: [BITX20] My uBitx shipped today

 

Hi, Gary (Shriver)! 
You were curious about DHL shipping.  I just got my ubitx this afternoon. 

I ordered it 12/23 and it shipped day before yesterday.  Here's the path it took (from bottom to top):

=====================
Wednesday, February 21, 2018         Location         Time

19     Delivered - Signed for by     BEAVERTON                 12:59 PM    
18     With delivery courier     PORTLAND, OR - USA         10:55 AM    
17     Arrived at Delivery Facility in PORTLAND - USA         9:32 AM    
16     Departed Facility in SEATTLE - USA                           8:21 AM    
15     Transferred through SEATTLE - USA                          8:19 AM    
14     Arrived at Sort Facility SEATTLE - USA                      7:21 AM    
13     Departed Facility in CINCINNATI HUB - USA                5:15 AM    
12     Clearance processing complete at CINCINNATI HUB - USA    3:16 AM    
11     Processed at CINCINNATI HUB - USA                          3:16 AM    
10     Arrived at Sort Facility CINCINNATI HUB - USA           12:20 AM    

Tuesday, February 20, 2018     Location             Time
9     Customs status updated     CINCINNATI HUB, OH - USA     7:44 PM    
8     Departed Facility in LEIPZIG - GERMANY                           7:52 PM    
7     Transferred through LEIPZIG - GERMANY                      7:50 PM    
6     Departed Facility in BANGALORE - INDIA                       12:40 PM    
5     Processed at BANGALORE - INDIA                                 11:50 AM    
4     Arrived at Sort Facility BANGALORE - INDIA                   10:20 AM    
3     Departed Facility in HYDERABAD                                   2:16 AM    
2     Processed at HYDERABAD - INDIA                                 1:15 AM    

Monday, February 19, 2018     Location             Time
1     Shipment picked up     HYDERABAD - INDIA                   4:38 PM    
=====================

Pretty fast!  Now the fun begins!.......:)
Tom
AB7WT

Re: RD16HHF1 in the uBITX #ubitx

K5ESS
 

I found the link but just missed the video.  Found it now.  Thanks.

Yep.  That’s exactly why I requested the call.

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Eric KE6US
Sent: Wednesday, February 21, 2018 3:35 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 in the uBITX

 

Sorry. I got lazy.

http://kd5ssj.com/solderpaste/smt-tools-and-process

Very informative. I haven't tried the beverage warmer he talks about to preheat the board. Good idea, though. I usually just wave the heat gun around a foot or so above the board to warm it up., but the beverage warmer is a more positive step that encourages doing it right.

Some people use a toaster oven for reflow and have developed temperature profiles matching commercial production techniques. That's the right way to do it, and backed up by science, but bench work doesn't always require the same techniques that commercial production requires. I never bought anything from Sony that incorporated dead bug construction, but I'm sure their engineers and techs do initial proof of concept that way.

Fun call on CW. I like it.

Eric KE6US

 

On 2/21/2018 11:17 AM, K5ESS wrote:

Eric,

Couldn’t find your earlier link to “Cash’s video”.  Could you re-post.

Thanks

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Eric KE6US
Sent: Wednesday, February 21, 2018 12:07 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 in the uBITX

 

Looks fine. Mine is from Michael's rated at 360w. It was $20. WalMart might even be cheaper. They're probably all nearly identical. Mine looks like the one you show except for packaging details. BTW, it's super for heat shrink tubing too.

You control the heat with the distance from the piece. I start out about a foot away to get the board warmed up to a point where I don't want to touch it, Keep the end moving. Watch Cash's video that I link to earlier. It's really that easy.

Don't get too close to the part while the solder paste is still grey. There's a point where the solder paste starts getting a little glossy and slick. You can blow the part right off the pads if you get too aggressive. For that matter, I often tape smaller PCBs down as they can scoot around from the air flow too. Then it's magic. The solder turns silver, the part aligns itself right on the pads better than you did, and it's a thing of beauty.

On very tiny parts, say ones with 0.5 pitch pins, you can get solder bridges. Don't worry about them. A light touch with solder wick and a soldering iron and they disappear leaving the part perfectly soldered in place. On many tiny parts with lots of legs, I just lay down a running blob of solder that shorts all the pins together, then wick up the excess. I did about a dozen AD9850s that way. All perfect.

I understand some guys have tremors and other things that would make SMT difficult. It takes a steady hand to place the parts but not nerves of steel. I suspect anyone who can walk from the kitchen to their workbench with a full cup of coffee without spilling any could manage the larger SMTs without difficulty.

SMTs open up a whole new world of kit building and homebrew possibilities. They aren't limiting our abilities at all. We're doing that to ourselves.

Eric KE6US

 

On 2/20/2018 9:21 PM, VE7WQ wrote:

Thank you Eric,

 

What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or any craft store ?

 

73! George

VE7WQ

 

Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste and a $20 

EK> embossing tool (heat gun) from WalMart or any craft store. It makes the 

EK> 20-QFN or any other SMT easy. 

 

 

Re: rv2- messed up setting and txing like mad!!!

Alan -MMØWXT
 

Should I be measuring pa current or both? E.g. both wires from psu to black probe and 2 wires running of red probe to each input?

Re: RD16HHF1 in the uBITX #ubitx

Vince Vielhaber
 

Yeah, a pound of Kester last month was $25.10 + $7 shipping.

Vince.

On 02/21/2018 04:54 PM, Michael Hagen wrote:
He is not selling supplies anymore.

This is where he suggest getting supplies. CML Supply. They got lots
of good stuff and the prices look good.

Have you bought a pound of solder lately!

I am still trying to get solder paste down without a mess. I can't get
it thru syringes so far.

Mike, WA6ISP


https://www.cmlsupply.com/kester-ep256-lead-solder-paste-63-37-syringe-dispenser/



On 2/21/2018 1:35 PM, Eric KE6US wrote:

Sorry. I got lazy.

http://kd5ssj.com/solderpaste/smt-tools-and-process

Very informative. I haven't tried the beverage warmer he talks about
to preheat the board. Good idea, though. I usually just wave the heat
gun around a foot or so above the board to warm it up., but the
beverage warmer is a more positive step that encourages doing it right.

Some people use a toaster oven for reflow and have developed
temperature profiles matching commercial production techniques. That's
the right way to do it, and backed up by science, but bench work
doesn't always require the same techniques that commercial production
requires. I never bought anything from Sony that incorporated dead bug
construction, but I'm sure their engineers and techs do initial proof
of concept that way.

Fun call on CW. I like it.

Eric KE6US


On 2/21/2018 11:17 AM, K5ESS wrote:

Eric,

Couldn’t find your earlier link to “Cash’s video”. Could you re-post.

Thanks

Mike

K5ESS



*From:*BITX20@groups.io [mailto:BITX20@groups.io] *On Behalf Of *Eric
KE6US
*Sent:* Wednesday, February 21, 2018 12:07 PM
*To:* BITX20@groups.io
*Subject:* Re: [BITX20] RD16HHF1 in the uBITX



Looks fine. Mine is from Michael's rated at 360w. It was $20. WalMart
might even be cheaper. They're probably all nearly identical. Mine
looks like the one you show except for packaging details. BTW, it's
super for heat shrink tubing too.

You control the heat with the distance from the piece. I start out
about a foot away to get the board warmed up to a point where I don't
want to touch it, Keep the end moving. Watch Cash's video that I link
to earlier. It's really that easy.

Don't get too close to the part while the solder paste is still grey.
There's a point where the solder paste starts getting a little glossy
and slick. You can blow the part right off the pads if you get too
aggressive. For that matter, I often tape smaller PCBs down as they
can scoot around from the air flow too. Then it's magic. The solder
turns silver, the part aligns itself right on the pads better than
you did, and it's a thing of beauty.

On very tiny parts, say ones with 0.5 pitch pins, you can get solder
bridges. Don't worry about them. A light touch with solder wick and a
soldering iron and they disappear leaving the part perfectly soldered
in place. On many tiny parts with lots of legs, I just lay down a
running blob of solder that shorts all the pins together, then wick
up the excess. I did about a dozen AD9850s that way. All perfect.

I understand some guys have tremors and other things that would make
SMT difficult. It takes a steady hand to place the parts but not
nerves of steel. I suspect anyone who can walk from the kitchen to
their workbench with a full cup of coffee without spilling any could
manage the larger SMTs without difficulty.

SMTs open up a whole new world of kit building and homebrew
possibilities. They aren't limiting our abilities at all. We're doing
that to ourselves.

Eric KE6US



On 2/20/2018 9:21 PM, VE7WQ wrote:

Thank you Eric,



What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat
Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or
any craft store ?



73! George

VE7WQ



Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste
and a $20

EK> embossing tool (heat gun) from WalMart or any craft store. It
makes the

EK> 20-QFN or any other SMT easy.


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

Re: RD16HHF1 in the uBITX #ubitx

Michael Hagen
 

He is not selling supplies anymore.

This is where he suggest getting supplies.  CML Supply.  They got lots of good stuff and the prices look good.

Have you bought a pound of solder lately!

I am still trying to get solder paste down without a mess.   I can't get it thru syringes so far.

Mike, WA6ISP


https://www.cmlsupply.com/kester-ep256-lead-solder-paste-63-37-syringe-dispenser/



On 2/21/2018 1:35 PM, Eric KE6US wrote:

Sorry. I got lazy.

http://kd5ssj.com/solderpaste/smt-tools-and-process

Very informative. I haven't tried the beverage warmer he talks about to preheat the board. Good idea, though. I usually just wave the heat gun around a foot or so above the board to warm it up., but the beverage warmer is a more positive step that encourages doing it right.

Some people use a toaster oven for reflow and have developed temperature profiles matching commercial production techniques. That's the right way to do it, and backed up by science, but bench work doesn't always require the same techniques that commercial production requires. I never bought anything from Sony that incorporated dead bug construction, but I'm sure their engineers and techs do initial proof of concept that way.

Fun call on CW. I like it.

Eric KE6US


On 2/21/2018 11:17 AM, K5ESS wrote:

Eric,

Couldn’t find your earlier link to “Cash’s video”.  Could you re-post.

Thanks

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Eric KE6US
Sent: Wednesday, February 21, 2018 12:07 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 in the uBITX

 

Looks fine. Mine is from Michael's rated at 360w. It was $20. WalMart might even be cheaper. They're probably all nearly identical. Mine looks like the one you show except for packaging details. BTW, it's super for heat shrink tubing too.

You control the heat with the distance from the piece. I start out about a foot away to get the board warmed up to a point where I don't want to touch it, Keep the end moving. Watch Cash's video that I link to earlier. It's really that easy.

Don't get too close to the part while the solder paste is still grey. There's a point where the solder paste starts getting a little glossy and slick. You can blow the part right off the pads if you get too aggressive. For that matter, I often tape smaller PCBs down as they can scoot around from the air flow too. Then it's magic. The solder turns silver, the part aligns itself right on the pads better than you did, and it's a thing of beauty.

On very tiny parts, say ones with 0.5 pitch pins, you can get solder bridges. Don't worry about them. A light touch with solder wick and a soldering iron and they disappear leaving the part perfectly soldered in place. On many tiny parts with lots of legs, I just lay down a running blob of solder that shorts all the pins together, then wick up the excess. I did about a dozen AD9850s that way. All perfect.

I understand some guys have tremors and other things that would make SMT difficult. It takes a steady hand to place the parts but not nerves of steel. I suspect anyone who can walk from the kitchen to their workbench with a full cup of coffee without spilling any could manage the larger SMTs without difficulty.

SMTs open up a whole new world of kit building and homebrew possibilities. They aren't limiting our abilities at all. We're doing that to ourselves.

Eric KE6US

 

On 2/20/2018 9:21 PM, VE7WQ wrote:

Thank you Eric,

 

What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or any craft store ?

 

73! George

VE7WQ

 

Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste and a $20 

EK> embossing tool (heat gun) from WalMart or any craft store. It makes the 

EK> 20-QFN or any other SMT easy. 

 



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

Re: Variable power control

LKNDAVE
 

Re: RD16HHF1 in the uBITX #ubitx

Eric KE6US
 

Sorry. I got lazy.

http://kd5ssj.com/solderpaste/smt-tools-and-process

Very informative. I haven't tried the beverage warmer he talks about to preheat the board. Good idea, though. I usually just wave the heat gun around a foot or so above the board to warm it up., but the beverage warmer is a more positive step that encourages doing it right.

Some people use a toaster oven for reflow and have developed temperature profiles matching commercial production techniques. That's the right way to do it, and backed up by science, but bench work doesn't always require the same techniques that commercial production requires. I never bought anything from Sony that incorporated dead bug construction, but I'm sure their engineers and techs do initial proof of concept that way.

Fun call on CW. I like it.

Eric KE6US


On 2/21/2018 11:17 AM, K5ESS wrote:

Eric,

Couldn’t find your earlier link to “Cash’s video”.  Could you re-post.

Thanks

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Eric KE6US
Sent: Wednesday, February 21, 2018 12:07 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 in the uBITX

 

Looks fine. Mine is from Michael's rated at 360w. It was $20. WalMart might even be cheaper. They're probably all nearly identical. Mine looks like the one you show except for packaging details. BTW, it's super for heat shrink tubing too.

You control the heat with the distance from the piece. I start out about a foot away to get the board warmed up to a point where I don't want to touch it, Keep the end moving. Watch Cash's video that I link to earlier. It's really that easy.

Don't get too close to the part while the solder paste is still grey. There's a point where the solder paste starts getting a little glossy and slick. You can blow the part right off the pads if you get too aggressive. For that matter, I often tape smaller PCBs down as they can scoot around from the air flow too. Then it's magic. The solder turns silver, the part aligns itself right on the pads better than you did, and it's a thing of beauty.

On very tiny parts, say ones with 0.5 pitch pins, you can get solder bridges. Don't worry about them. A light touch with solder wick and a soldering iron and they disappear leaving the part perfectly soldered in place. On many tiny parts with lots of legs, I just lay down a running blob of solder that shorts all the pins together, then wick up the excess. I did about a dozen AD9850s that way. All perfect.

I understand some guys have tremors and other things that would make SMT difficult. It takes a steady hand to place the parts but not nerves of steel. I suspect anyone who can walk from the kitchen to their workbench with a full cup of coffee without spilling any could manage the larger SMTs without difficulty.

SMTs open up a whole new world of kit building and homebrew possibilities. They aren't limiting our abilities at all. We're doing that to ourselves.

Eric KE6US

 

On 2/20/2018 9:21 PM, VE7WQ wrote:

Thank you Eric,

 

What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or any craft store ?

 

73! George

VE7WQ

 

Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste and a $20 

EK> embossing tool (heat gun) from WalMart or any craft store. It makes the 

EK> 20-QFN or any other SMT easy. 

 


Re: Variable power control

LKNDAVE
 

parts:
q- tip142 $ 1.26 each
l1,2- 100 uh power inductor 
c1,2 - 100 ufd @ 50 vdc $.12 each
sw- your pick. rotary make before break 3 -5 pos depending how many levels you want .$.89 EACH
R1 1K 1/2 WATT -$.25 FOR 10
IF TOGGLE SPST USED LIKE SCHEMATIC THEN 10K 1/4 WATT.
PERF, VERO 
ZENER DIODES FROM THE 1N47XX SERIES $.04 EACH.
IF YOU WANT 5 VOLTS GET 1N4734 5.6 VOLT
9.3 VOLT USE 1N4740 10 VOLT.
ETC
DAVE

Re: My uBitx shipped today

Tom Christian
 

Hi, Gary (Shriver)! 
You were curious about DHL shipping.  I just got my ubitx this afternoon. 

I ordered it 12/23 and it shipped day before yesterday.  Here's the path it took (from bottom to top):

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Wednesday, February 21, 2018         Location         Time

19     Delivered - Signed for by     BEAVERTON                 12:59 PM    
18     With delivery courier     PORTLAND, OR - USA         10:55 AM    
17     Arrived at Delivery Facility in PORTLAND - USA         9:32 AM    
16     Departed Facility in SEATTLE - USA                           8:21 AM    
15     Transferred through SEATTLE - USA                          8:19 AM    
14     Arrived at Sort Facility SEATTLE - USA                      7:21 AM    
13     Departed Facility in CINCINNATI HUB - USA                5:15 AM    
12     Clearance processing complete at CINCINNATI HUB - USA    3:16 AM    
11     Processed at CINCINNATI HUB - USA                          3:16 AM    
10     Arrived at Sort Facility CINCINNATI HUB - USA           12:20 AM    

Tuesday, February 20, 2018     Location             Time
9     Customs status updated     CINCINNATI HUB, OH - USA     7:44 PM    
8     Departed Facility in LEIPZIG - GERMANY                           7:52 PM    
7     Transferred through LEIPZIG - GERMANY                      7:50 PM    
6     Departed Facility in BANGALORE - INDIA                       12:40 PM    
5     Processed at BANGALORE - INDIA                                 11:50 AM    
4     Arrived at Sort Facility BANGALORE - INDIA                   10:20 AM    
3     Departed Facility in HYDERABAD                                   2:16 AM    
2     Processed at HYDERABAD - INDIA                                 1:15 AM    

Monday, February 19, 2018     Location             Time
1     Shipment picked up     HYDERABAD - INDIA                   4:38 PM    
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Pretty fast!  Now the fun begins!.......:)
Tom
AB7WT