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Message: <blockquote data-quote="arwooldridge" data-source="post: 560073" data-attributes="member: 35807"><p>Unpolarised electolytics are just made up from back to back polarised electrolytics in one can, one of them is always reversed biased so no additional current flows over the normal capacitative current. You can use two ordinary polarised electrolytics and back to back them. One acts as a sort of diode and the other acts as a capacitor alternately. So two 1uF's back to back gives you 1uF, but for very small signals say less than 100 or 200mV it would act like 0.5uF as neither get sufficiently reversed biased, and act like normal capacitors in series. Very rarely used nowadays though I think.</p></blockquote><p></p>