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AmpCasq: an OPA1622 integrated headamp project
AmpCasq: an OPA1622 integrated headamp project
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Old 7th March 2017, 01:57 PM   #21
adydula is offline adydula  United States
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Thanks Guys!

If you can do this I am sure I will be able to as well!!
My 67 year old eyes need some help at times!! Ha!

Have to order some parts now!

Thanks Again!
Alex
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Old 7th March 2017, 02:01 PM   #22
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by OlegSh View Post
Nigel, your method works for SOIC packages, SMD resistors and capacitors etc., but leadless QFN package with 0.5 mm pitch is a different story
I try to steer away from small SMD if I can.
Sadly more and more through hole components are becoming hard to find.
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Old 7th March 2017, 02:02 PM   #23
OlegSh is offline OlegSh
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AmpCasq: an OPA1622 integrated headamp project
It's hard to steer away from the future...
I guess with ever decreasing assembly prices and extinction of good leaded parts the entire diy activity is in danger...
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Old 7th March 2017, 02:04 PM   #24
adydula is offline adydula  United States
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Guess future DIY'ers will have to invest in some more exotic soldering equipment!!

LOL
Alex
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Old 7th March 2017, 02:06 PM   #25
OlegSh is offline OlegSh
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AmpCasq: an OPA1622 integrated headamp project
pick-and-place robots and reflow ovens
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Old 7th March 2017, 02:22 PM   #26
adydula is offline adydula  United States
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Spent 40 yrs at IBM testing memory and support chips....they had these really big molten solder "pots" or "vessels" to solder an entire pcb assembly with hundreds of parts...amazing at the time....70's...
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Old 7th March 2017, 03:13 PM   #27
johnc124 is offline johnc124  United States
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Get yourself a decent flux pen. And then wonder how you soldered all those years without it...

Just remember to thoroughly clean the PCB after doing assembly involving flux. Leftover flux on the PCB can create all sorts of funny behavior.
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Old 7th March 2017, 03:49 PM   #28
adydula is offline adydula  United States
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Thanks for the suggestion John....is this one ok?

https://www.amazon.com/Kester-951-So.../dp/B004X4KOWS

Alex
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Old 7th March 2017, 06:32 PM   #29
AIM65 is offline AIM65  France
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AmpCasq: an OPA1622 integrated headamp project
Quote:
Originally Posted by adydula View Post
Thanks for the suggestion John....is this one ok?

https://www.amazon.com/Kester-951-So.../dp/B004X4KOWS

Alex
Alex

Please find some inputs based on my experience:
I decided to go on this project after having watched some videos on YouTube. These video did let me think that DFN packages (TI call them VSON or WSON) soldering was within my reach.

First video set the method: you heat the chip under the board assuming you have designed the pcb footprint of the chip with thermal vias (big one) under the chip pad (As OlegSh did notice in post#18). For the project I've designed 3 footprint in Kicad for the 3 chips with such vias.

Second video propose to use solder paste rather than ‘presoldering’ as on the first video (do not add flux to paste, as paste should already contain flux). Advantage is that solder paste allow you to precisely position the chip at the right place and keep it in place if you accidentally breath on it (LM27761 is 2*2 mm ! ). You may also use paste to solder SOIC, 0805, etc. it allows you to control the amount of solder and to keep parts in place. Second video use hot air, as I didn’t want to invest in air gun that’s why I choose to mix the methods of the two videos.

I’ve also invested in a stand which allows to solder underneath the board.
You also need flux (flux is everything says the guy form EEVBlog !) and good solder wick. I had to unsolder many times the LM27761, flux is mandatory for this. The main issue with those tiny chips when you’re making prototypes is that when you encounter a problem, you never know if is due to the circuit (the design) or the solder of the chip. So I did unsolder the LM27761 many times before really suspecting the design, in my case the Pcb layout around the LM27761 was bad...


First video: https://www.youtube.com/watch?v=d-f-...ndex=2&list=WL
Second video: https://www.youtube.com/watch?v=M_rO6oPVsws&t=31s
The stand: http://www.ebay.fr/itm/Support-de-circuit-imprime-3eme-main-PCB-plaque-dessai-soudure-montage-platine/111752564162 (in french but available in many ebay, Ali…shops)

Hope this help
Regards

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Old 7th March 2017, 09:00 PM   #30
xrk971 is offline xrk971  United States
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AmpCasq: an OPA1622 integrated headamp project
Flip up binocular magnifiers, good tweezers, solder paste syringe, and a cheap skillet and hot plate for reflow. It's actually faster and parts are higher quality and less expensive. 100 name brand 1% metal thin film resistors are $0.77 from Digikey.
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