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Apt Holman plug-in MC expansion board
Apt Holman plug-in MC expansion board
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Old 23rd May 2020, 03:06 PM   #21
georgesgiralt is offline georgesgiralt  France
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Join Date: Jul 2008
Neat !
I've some SMD skill doing repair on some computer cards. I trained myself by using a small SMD soldering kit bought direct from China. Once soldered, you can watch the LED blink...
Here is the Bangood link of the product I used (I did not buy it on Bangood, there are a lot of sellers on Amazon, Aliexpress,Bangood, Ebay, etc...) but you'll have an idea of the kit I talk about... The parts on the right hand side are a real challenge ... You need proper technique to do it.
Diy smd rotating led smd components soldering practice board skill training kit Sale - Banggood.com|Shopping Francais

Last edited by georgesgiralt; 23rd May 2020 at 03:07 PM. Reason: With the link it is better ;-)
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Old 23rd May 2020, 11:29 PM   #22
seanc is offline seanc  United States
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Join Date: Mar 2009
Quote:
Originally Posted by georgesgiralt View Post
Thank you for your answer.
Oh yes, I would like to get the files ! and a shop or a list of shop having the connector (my search did not get much, but I live in France) !

I thank you again in advance !
Here's the bulk of files. Includes the gerber files for board fabrication, the Parts List w/Mouser part numbers (my choices, you may use others), spreadsheets to calculate the gain & load resistors appropriate for your cartridge, schematic and a "build notes" text file.
Apt_MC-v2_files.zip

Quote:
...I've some SMD skill doing repair on some computer cards. I trained myself by using a small SMD soldering kit bought direct from China...
Did you manage to solder the QFP-44 chip (0.8mm pin-space) on the back side? The Apt card LTC3260 chip is even smaller than that with 0.5mm pin-space, AND ... the ground connection is by under-chip pad which has to be soldered through a hole on the PCB back side (see the photos in the download files). It can be tricky to get soldered properly.
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Old 24th May 2020, 07:34 AM   #23
georgesgiralt is offline georgesgiralt  France
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Join Date: Jul 2008
Actually, pads on the back are for identification purposes and serve as a ruler. The only chips to solder are at the front. But I've "successfully" soldered parts very fine on a computer board. I cant remember the exact spacing but I know that i was clever enough to buy more than one before making the repair... I'm more than ten years older now, so I wonder if i would be able to do it (the card was so crowded around it with very important component that I handled the hot air tube with fear...And once the faulty part removed, i did the soldering one pin at a time with some time between them.
But I was very happy to have repaired this card. So the reward was good. (and price very low compared to a new Mobo... )
Thank you VERY MUCH for your work and for sharing it !
I know what project I'll do during the summer if the lock down strikes again in France !
Have a bright and sunny day ! Stay safe.
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Old 24th May 2020, 09:56 AM   #24
georgesgiralt is offline georgesgiralt  France
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Join Date: Jul 2008
I forgot to tell you that if you want to train yourself to very hard SMD soldering, get a ruined disk drive electronic interface, and remove the integrated circuits, clean the pads with a damp sponge and then solder them back...
These are challenging !
The one I'm looking at has a circuit with 38 pins per side, those pins occupying 14 mm of printed board.. That's a challenge I think... ;-)
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