How reliable is Wire Glue?

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belltones
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Re: How reliable is Wire Glue?

Post by belltones » Sun Aug 13, 2017 11:11 pm

Mooger5 wrote:The other had lost the solderable area for two or three pins. Lose just one of these and the entire chip is wasted.
Ah, it is as I feared. I was hoping that you were about to discover a solution for this problem, but all my experiences made me suspect that it was impossible. I hate it how when just one of those pins breaks off it's like "Well, there goes $40"... unless there's some tiny dab of the original solder still there :cry:

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Re: How reliable is Wire Glue?

Post by Mooger5 » Mon Aug 14, 2017 9:39 pm

Well, on my part deliberately discarding the original pins was a bad idea to start with. They´re shaped like tweezers on one end for a reason and that reason is to sustain the entire module. One should always clamp the "tweezers" to ensure a good grip and only then should they be soldered to the pads. Relying solely on solder connections that are glued to a ceramic substrate to have the double function of mechanical support while carrying electric signals at the same time is a no-no IMO especially when the modules can get quite warm. I took the idea from a tech whose work I respect but this is not a good solution.

Now imagine an 80017A built as it should have from the start: on a double sided FR4 PCB with real copper traces and real SMD resistors. Something that´d resemble the AR clones in appearance, made with real BA662s and IR3109 instead of the LM13700s. With all the thousands of "acetoned" chips out there, wouldn´t that be fantastic? :)

I have found my notes on the correct pin numbers for the SOIC Ba662 and the resistor values. I´ll share them tomorrow if it´s of interest.

Cheers!
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Re: How reliable is Wire Glue?

Post by Mooger5 » Tue Aug 15, 2017 10:10 pm

And another chip found under a pile of "things to do". This one actually has the original pins and again the solderable area vanished without hope notably on pin 11 - VCA Control". Pin 9 - VCA In does have a useable vestige but notice how it disappeared around the "claw". So I´ll have to eat my own words: ditching the original pins is not a good idea, but leaving them attached doesn´t help, either.

Looks like you can´t be overzealous with the acetone treatment...

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