Can I use electrolytic capacitor for tuning a common emitter amplifier?

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obrien135

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If I use a transformer in the collector circuit of a common emmittor amplifier to match impedance and a capacitor on it's primary to tune the amp to a certain frequency, is it OK for that capacitor to be electrolytic? The frequency is 3MHz.
 

capacitor question

No. The inductor voltage will swing both ways (i.e. the collector voltage will go above the positive rail) so the capacitor must be unpolarised.

Keith
 

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