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Convert CMOS-level signal to microphone-level (0..3V --> -1..+1V)?

Discussion in 'Physics' started by iter, Oct 8, 2018.

  1. iter

    iter Guest

    I'm building a microcontroller circuit that feeds its output into a microphone input of an audio recorder. The output is a square wave. (Think old-style 3.5mm Square credit card readers)

    What can I use to covert a signal in the range of 0..3V to -1..+1V?

    I could just use a voltage divider and feed 0..+1V to the audio, but I understand that many audio input circuits use AC coupling and the recorded waveform can have unpredictable DC bias. This is undesirable, since the waveform encodes information in zero-crossings.

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