I have a small project to make where I need to provide DC isolation for a low impedence audio circuit. I need a non-polarized capacitor of about
A clamping diode in parallel with each capacitor wouldn't hurt, just to make sure reverse charging can't happen!
In order to get 100uF with two caps in series, they will each need to be 200 ( 220 ) uF. I have seen this done many times to produce a bipolar electrolytic. Usually, it's the two " - " terminals that are joined, leaving the two " + " terminals for connection. I don't know whether there's some valid reason for this. I seem to remember reading in the dim distant past, that it's something to do with which is the outer foil in the cap, but I don't really see why this should make any difference, and I'm sure it won't in an audio coupling application. 'Genuine' bipolars are readily available in this sort of value.
Arfa
In my experience non-polar electrolytics have tended to be unreliable, expensive & oversized!
i've seen many used like that with an encapsulated package to make it look like a single. btw. i could be wrong here but if your looking for
100 uf then i think you should keep with using 2 100 uf in series because one is going to short while the other charges and they need to be back to back of course.
Hi Ian Yeah, interesting you should say that. They do tend to be bigger, although I'm not sure that I've really found them any less reliable. Even given that they are bigger, I guess that one of them has still got to take up less board space than two regulars back to back, though.
Arfa
Thanks all for the >
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