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ProtoDAC TDA1387 X8 project

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ProtoDAC TDA1387 X8 project
Skip Pack Offline
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#31
06-05-2023, 04:40 PM
Hi All,

I assembled my 'test' version with a socket for the dac assemblys and mundane IV resistors. I need to clip some of the leads on the bottom, and have a question: I was advised long ago that it is best not to trim leads after soldering, and I always bend thin leads over to hold position and clip them before soldering. The advice rationale was that the shock of the snap when clipping could crack the solder joint. With two sided and through hole plating I suspect that is much less valid today. With the thick leads on the RCA outputs there will be a fair amout of 'snap'. I'm inclined to reheat such post-clipped joints just on principle even if they look good. What is peoples' experience here?

I also have to 'unclothe' one of my RPi 4Bs before testing.

Thanks,

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hifinet Offline
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#32
06-05-2023, 05:05 PM (This post was last modified: 06-05-2023, 05:25 PM by hifinet.)
I bend, solder then clip. Then examine all joints with a loupe. Not sure if that is the proper technique. If the solder flows through the plated hole to the top side, I think the chance of failure is very low. One thing to be aware of is to apply much more heat to the pads that connect to the ground plane, due to the heat sink effect. Those are pin 5 of the module, the two ground leads of the I/V resistors and the ground leads of the RCA jacks. Also, GPIO header pins 6 and 14.
Hardware: ProtoDAC TDA1387 X8 | PGA2311 | Icepower 500ASP | Harbeth SHL5
Software: Moode 8.3.0
Source: Win 10 NAS
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fdealexa Offline
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#33
06-05-2023, 05:08 PM
Hi everyone,
personally, I prefer to cut the terminals of the components before soldering, without bending them (avoiding problems in case of any disassembly).
Best regards,
Francesco
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michaelagiles Offline
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#34
06-05-2023, 09:54 PM
Great Appreciation to Mark! I received my DAC this week and it is SWEET! It was a long and arduous process to get through customs - no thanks to son of NAFTA - but with MW's dedication and integrity he got it done. Thanks Again!
MG
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rh2018 Offline
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#35
Yesterday, 03:38 AM
@Skip Pack - It's true that some side cutters apply excess shock to a solder joint when trimming leads. I find Xuron Micro-Shear Flush Cutter best for PCB work. Solder then clip. No need to re-flow.

https://www.amazon.com.au/Xuron-170-II-M...6464&psc=1 

It's also good practise to remove flux with Isopropyl alcohol and do a final visual with a loupe as @hifinet suggests.
Richard
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Skip Pack Offline
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#36
Yesterday, 11:45 PM
(Yesterday, 03:38 AM)rh2018 Wrote: @Skip Pack - It's true that some side cutters apply excess shock to a solder joint when trimming leads. I find Xuron Micro-Shear Flush Cutter best for PCB work. Solder then clip. No need to re-flow.

https://www.amazon.com.au/Xuron-170-II-M...6464&psc=1 

It's also good practise to remove flux with Isopropyl alcohol and do a final visual with a loupe as @hifinet suggests.
Richard

Thanks to all for your responses. I'll pick up some of the recommended cutters. I always do the alcohol cleanup of flux, so that's good.

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