Date   

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):

=====================
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

Eric KE6US
 

I rarely do. Sometimes I'll tape a hunk of fish paper over a thru-hole I think might not like the heat. Or I might cover a previous SMT part that might come unsoldered and get misaligned or blown away. Most of the time, I'm working with all SMT components and don't bother. Usually, I'm more likely to forget what's under the part like my bench or anti-static mat and melt THAT. I use a block of maple about 10" square when I think of it. It won't burn and it doesn't conduct heat so I don't inadvertently burn my hands. Temps are way below what would burn paper or wood, but enough to cause a painful burn or melt plastic including anti-static mats it turns out. Who knew?

Eric KE6US




Usually, I solder-paste a whole stage on the board, then heat them all at the same time. It's a judgment thing. If there are a lot of close spaced parts I won't load the board up as some of them could get dislocated and I wouldn't notice. But 10 or so parts in a relatively small area are easy to do all at once. Just keep an eye on the condition of the grey paste. You'll learn to tell a lot about what's going on and what's needed from the color and texture of it.

There's a danger in overthinking it. It's much harder to describe or visualize than it is to see it for yourself the first time. Most of the parts are cheaper than dirt. If you screw one up, or send it flying into oblivion, big deal. A resistor might cost 10 for a penny or sometimes far less. I'm not suggesting anyone be careless. I'm saying don't fall for the scary stories. After a small project or two you won' even understand what the fuss was about.

Eric KE6US


On 2/21/2018 10:31 AM, VE7WQ wrote:

Thank you Eric, for the very valuable tips, can't wait to try it out. 

How do you protect the other components from the hot air?


73! George

VE7WQ


Wednesday, February 21, 2018, you wrote:

EK>  It's really that easy.

EK> and it's a thing of beauty.

EK> I did about a dozen AD9850s that way. All perfect.


EK> Eric KE6US




Re: Variable power control

LKNDAVE
 

one or the other. the object is to noy let the base of the transistor float. tayda make before break 3/4 position .089 $ each. no 10k needed.


Re: BITX-40 just built it #bitx40

Jens / DH1AKY
 

now operational, see here


Re: RD16HHF1 in the uBITX #ubitx

Michael Shreeve
 

is there a simple way , like a/d converter, to take an analog voltage and offer it to a device using the PE3402 ? The A/d converter would need 4 bit output. 

On Tue, Feb 20, 2018 at 12:46 PM, RCBoatGuy via Groups.Io <ijnfan-HamRadio@...> wrote:
The AD8367 is more than twice as expensive as the PE4312, though the AD8367 datasheet does show how to implement AGC with it using 2 additional chips.  So if you want to include AGC with programmable attenuation, the AD8367 may be the way to go.

However, for less than the cost of a single AD8367 you can put two PE3412's in series to get attenuation up to 62dB.  

Not sure what the best trade-off is.  Depends on your needs and price range, I guess.

Carl,
K0MWC




--
Michael Shreeve N6GRG
15901 Cloverdale Road
Anderson, CA 96007
530-410-8678
"Don't worry about a thing, 'Cause every little thing gonna be all right!" -Bob Marley




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

Don, ND6T
 

I just posted these, and more, on www.ND6T.com
More to come.
Have fun!
-Don, ND6T


Re: Variable power control

K9HZ <bill@...>
 

Yeah that works. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Feb 21, 2018, at 12:48 PM, LKNDAVE via Groups.Io <novatronix@...> wrote:

THE ZENERS SET THE PASS VOLTAGE OF THE 100 VOLT 10 AMP DARLINGTON. sorry caps lock. they are 1 amp devices but the transistor slaves them to 10 amp handling. i have used this ciruit fo over 40 years. tayda has most of the parts, total like 5 bucks plus cheap shipping. read notes on schem. this is a 2 voltage control. my crappy software didnt have 4 position rotaries but most will get the idea. the transistor also has reverse emf diode built in.
dave<SERIESPASS.bmp>


Re: RD16HHF1 in the uBITX #ubitx

Jerry Gaffke
 

Try this old post:
    https://groups.io/g/BITX20/message/40216


On Wed, Feb 21, 2018 at 11:18 am, K5ESS wrote:

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

 


Re: RD16HHF1 in the uBITX #ubitx

Vince Vielhaber
 

It's a heat resistant tape that's flame resistant and good to 600F (intermittantly). I know it's also used with heating elements and is used by some on their 3D printers. I bought it 'cuze I have two surface mount ICs that I need to replace on my Yaesu 100D LFP board.

Vince.

On 02/21/2018 12:06 PM, Roy Appleton wrote:
Vince, I'd like to know more about the uses of that tape. Do you have
any additional tips or links to explanations of the tape?

Thanks
Roy
WA0YMH

On Feb 21, 2018 10:50 AM, "Vince Vielhaber" <vev@...
<mailto:vev@...>> wrote:

Yes, Kapton Tape is recommended when using hot air for [de]soldering.

Vince.




On 02/21/2018 09:10 AM, Jack Purdum via Groups.Io wrote:

Don't know about the tape...never tried it, but I don't see why it
wouldn't work.

Jack, W8TEE


------------------------------------------------------------------------
*From:* VE7WQ <@VE7WQ <mailto:@VE7WQ>>
*To:* BITX20@groups.io <mailto:BITX20@groups.io>
*Sent:* Wednesday, February 21, 2018 12:07 AM
*Subject:* Re: [BITX20] RD16HHF1 in the uBITX


Thank you Jack,

I ordered a SMT SMD Component Welding Practice Board Kit US $0.99
http://tinyurl.com/ya7l9hym

Question, could I use this tape:
Self-adhesive Tape Soldering High Temperature Heat Resistant for
BGA PCB
SMT US $0.99
https://tinyurl.com/yak4p4ea
with my Hakko FX-901 Cordless Soldering Iron to solder SMTs, SMDs?

73! George
VE7WQ

Tuesday, February 20, 2018, you wrote:
JPvGI> Sorry about that. See ebay #192343157603 and picture at
bottom.
JPvGI> Jack, W8TEE


@VE7WQ <mailto:@VE7WQ> <mailto:@VE7WQ <mailto:@VE7WQ>>>
BITX20@groups.io <mailto:BITX20@groups.io>
<mailto:BITX20@groups.io <mailto:BITX20@groups.io>>




JPvGI> #yiv0457961818 #yiv0457961818 --body {margin:5px 5px 5px
JPvGI> 5px;background-color:#fdf4d7;}#yiv0457961818
#yiv0457961818 hr
JPvGI> {color:#000000;}#yiv0457961818 body, #yiv0457961818 table
#yiv0457961818
JPvGI>
{font-size:12pt;font-style:normal;font-weight:normal;color:#000000;text-decoration:none;}#yiv0457961818
JPvGI> span.yiv0457961818rvts1 #yiv0457961818
JPvGI>
{font-size:10pt;font-weight:bold;color:#0000ff;}#yiv0457961818
JPvGI> span.yiv0457961818rvts2 #yiv0457961818
JPvGI>
{font-size:10pt;font-weight:bold;color:#000080;}#yiv0457961818
JPvGI> span.yiv0457961818rvts3 #yiv0457961818
JPvGI>
{font-size:10pt;font-style:italic;color:#800000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts4, #yiv0457961818 span.yiv0457961818rvts4
JPvGI> #yiv0457961818
JPvGI>
{font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI> a.yiv0457961818rvts5, #yiv0457961818 span.yiv0457961818rvts5
JPvGI> #yiv0457961818
JPvGI>
{font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI>
span.yiv0457961818rvts6{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI>
span.yiv0457961818rvts7{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts8, #yiv0457961818
JPvGI>
span.yiv0457961818rvts8{color:#0000ff;text-decoration:underline;}#yiv0457961818
JPvGI> #yiv0457961818 p, #yiv0457961818 ul, #yiv0457961818 ol
#yiv0457961818
JPvGI> {text-align:left;text-indent:0px;padding:0px 0px 0px
0px;margin:0px 0px
JPvGI> 0px 0px;}#yiv0457961818 .yiv0457961818rvps1 #yiv0457961818
JPvGI> {text-align:center;}#yiv0457961818 Hello Jack,
JPvGI> With three of what? No picture (:The whole thing cost
$2.29 with
free shipping!URL please.
JPvGI> 73! GeorgeVE7WQ
JPvGI> Tuesday, February 20, 2018, you wrote:JPvGI> I've run
into the SMT
JPvGI> inertia as well. AT our club meeting next month, IJPvGI> am
setting up
JPvGI> three solder stations with three of these:
JPvGI>> and I'm going to have the members each solder as small a
part as
theyJPvGI> can handle. I think once they do it, they will see
how easy
it really is.JPvGI> BTW, when done and voltage is applied at the
bottom
center of the wheel,JPvGI> the LED's should light up. The whole
thing
cost $2.29 with free shipping!JPvGI> Once they see how easy it
is, then
I'm going to push how cheap the SMT's are.JPvGI> Jack, W8TEE






<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>>
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--
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
http://www.metalworkingfun.com





Re: Variable power control

Walter
 

Also I cannot read the values of the Caps due to pixelation.  Could you provided those values.


Re: Variable power control

Walter
 

Could you provide the number of the transistor?  Yes, I am that needed.  LOL

Thanks


Re: uBITIX Shipped

Jim Sheldon
 

Mine shipped same date, picked up Hyderabad 16:38 their time on the 19th - took 24 hours to get to Bangalore (got there 1646 on the 20th) and got hung up in Bangalore for some reason.  Finally left Bangalore 12:49 p.m. 21st (today Bangalore time), got to Leipzig, Germany 18:02 Leipzig time and left there at 19:55 today, Leipzig time.  Original delivery estimate to Wichita, KS was today by end of day.  Ain't gonna happen and it will probably get hung up in Cincinnati or Chicago for customs clearance like the last one did for a couple of days.  Maybe get here Friday, but I'm going to be surprised if it doesn't take until Monday but that's still only 7  days like the HF Signals website says.  The first one did only take 5 days to get here though.  We'll see.  At least it's enroute and over the Atlantic somewhere --

Jim - W0EB

------ Original Message ------
From: "WA9GQT via Groups.Io" <WA9GQT@...>
Sent: 2/21/2018 1:06:28 PM
Subject: Re: [BITX20] uBITIX Shipped

uBITX ordered on 12-23-2017. Received shipping email on Mon, Feb 19, 2018 5:29 am with DHL tracking number. It was delivered to me on Wed Feb 21, 2018 11:55am.
That was definitely worth the extra $10. Wow, very impressive! Thanks Farhan and all.
73, Rod WA9GQT


Re: RD16HHF1 in the uBITX #ubitx

K5ESS
 

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

Walter
 

So do I need both the 10k ohm resistor from c1 to ground and the make before break rotary or just one or the other?