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Old 16th December 2010, 01:55 PM   #1
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Default Conductive epoxy

I plan to use some polystyrene capacitors in an upgrade. Understanding the difficulty of soldering these, would a silver bearing conductive epoxy be a reasonable alternative. I have some of the Chemtronics TW2400. Thanks for your input. I am concerned that the epoxy might add to the the caps ESR, thus negating use of the low ESR in the first place.
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Old 16th December 2010, 02:13 PM   #2
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Polystyrene caps can be soldered -- they just can't go in a soldering oven. If you're worried about the heat one trick from the bygone era of germanium transistors was to use an alligator clip as a heat sink on the lead to be soldered. Another was to use a high temperature with a low temp solder and quick and deft handwork.
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Old 16th December 2010, 02:22 PM   #3
eyoung is offline eyoung  United States
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I use the alligator clip trick all the time just paranoid like that especially on small transistors , go to the shack and buy a small bag . Cheap and simple.

El
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Old 16th December 2010, 06:34 PM   #4
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Default Box type

These are box type and mount thru the hole and flush to the pcb. Thus no room for a heat sink while soldering. I was just wondering if anyone had used conductive epoxy and if so how were the results? Thanks again for the input. I may to rethink mounting rather than using an untested method.
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Old 17th December 2010, 12:40 AM   #5
Enzo is offline Enzo  United States
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Learn how to solder with confidence, and you will have no problem. Unsure soldering - heating and reheating the joint, adding "just a dab more" solder, using too cool an iron, etc - is a good way to heat stress parts.
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Old 17th December 2010, 12:50 AM   #6
eyoung is offline eyoung  United States
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ditto... solder with confidence don't be afraid and use a good soldering iron and good solder(don't use silver has to high a melting point).I use .050" dia 63/37 rosin core for most stuff. I'm sure this will elicit a flood of opinions.

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Old 17th December 2010, 10:23 AM   #7
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If the leads are tarnished, polish them up first. Cooking dirty leads in flux to get the solder to wet them is sure to melt the polystyrene.
And don't use lead free solder!
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Old 17th December 2010, 10:32 AM   #8
Magura is offline Magura  Denmark
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Quote:
Originally Posted by eyoung View Post
ditto... solder with confidence don't be afraid and use a good soldering iron and good solder(don't use silver has to high a melting point).I use .050" dia 63/37 rosin core for most stuff. I'm sure this will elicit a flood of opinions.

El
Exactly!

If soldered just reasonably right, only once, with 63/37 rosin core solder, and reasonably fast, you have no problem.

So instead of trying to get around to learn how to solder, just like others above I would suggest you learn to solder with confidence.
Learning to solder just reasonably well, will pay back soooo many times in the future.


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Old 18th December 2010, 10:24 AM   #9
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I have reasonble soldering skills, so I take all of the above advice. Polish leads, use flux and do it quickly. Hope this works. Thanks for the good suggestions.
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Old 18th December 2010, 10:36 AM   #10
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Cropping the leads before soldering also helps
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