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Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I thought it was a percentage of the full voltage rating, not 2-3V no matter what the voltage of the cap, but I could easily be wrong! That was the reason I used a 400V rated capacitor. It doesn't sound like crap by any means, and the cap hasn't failed yet... I guess it did help me find out what the value should be even If now I have to go buy some from somewhere.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
I just realized that what made me think the reverse voltage was so limited was actually something else. You see, at one point i accidentally hooked up my DRSSTC power supply backwards, and it was clamping my charging to like .5V. The .5V was really the IGBT diode drop, not the caps... "d'oh!".
I guess now that i think of it, ive seen lytics end up with -10's of volts when abused in coilguns and stuff. I dont think its good for the cap at all, so id still suggest finding a suitable "AC" capacitor.
Also, if you dont have the volume up much, you might just be running like 1V peak output from the amp.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
They make "Bipolar Electrolytic" caps to do what you want. I once had a 100Hz crossover for a sub, and the only components in it were a 6mH iron cored coil, and a 188uF one of these caps. They look like regular axial electrolytics except with rubber bungs in both ends.
If you can't get hold of that, you can try two ordinary lytics in series, back-to-back, with a diode across each to clamp any reverse voltage.
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Car audio Crossovers
That was the reason I used a 400V rated capacitor. It doesn't sound like crap by any means, and the cap hasn't failed yet... I guess it did help me find out what the value should be even If now I have to go buy some from somewhere.
