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electrolytic Coupling capacitors?

Discussion in 'Beginner Electronics' started by Jamie, Jul 3, 2006.

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  1. Jamie

    Jamie Guest

    Hello newsgroup,

    I've been working with this circuit:

    But I need to modify it slightly as the input will be two channels
    mixed into a mono signal. (It needs to drive a phone patch FROM a
    stereo signal) and I'm not real crazy about mixing voltages.

    Here's what I have at this point:

    It seemed to work well but I'm not sure if I have the polarity correct
    on the two capacitors in the circuit.

    Is it possible to use electrolytics in this manner?

    Am I correct in assuming the capacitors will provide the required
    isolation from the input signal? I'm not real crazy about casually mixing
    power signals from different sources as the original circuit used. (in this
    case, input will be line-level audio typically found from a "Tape Out." in
    a home stereo) On the other hand, I don't want to spend the $$ in isolation

    On the same topic, will the two capacitors prevent the left side
    from "driving" the right side or do I need resistors?

    I do electronics as a novice hobby and am not particularly good at it, but I
    must say, so far, I am *super* impressed with the LM386N, it's been driving
    two small speakers (~20 ohm load) with the source from a portable CD player,
    very low volume setting and it's still more then loud enough.

    Hopefully someone can tell me a bit about capacitor coupling. :)


  2. Jamie

    Jamie Guest

    Followup.. nevermind, solved it.

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