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From: Hannu Vuolasaho <vuokko AT msn DOT com>
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Subject: RE: [geda-user] through hole electrolytic capacitor convention
Date: Wed, 26 Oct 2011 21:13:44 +0300
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>
> I usually mark the positive side (with a "+" of course), and this is pretty much how I've always seen it done, in production boards whenever I tear something apart, short of using the shape of the component or a beveled corner as the marking in some surface-mount stuff.
>

I just opened one device. There was different silkscreens for different wattages of resistors. 1/4W drawn as European resistor symbol [=], 1/2W as curvy outline of through hole resistor and so on. Electrolytic capacitors had circle and segment hatched on - side and outside was + sign on other connector.

I don't know if it is convention but at least that was nice to repair. (Change the capacitors.) 

Hannu Vuolasaho