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Splicing right and left channel to one earbud/headphone

Discussion in 'General Electronics Discussion' started by mollekake, Oct 13, 2014.

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  1. mollekake


    Jun 30, 2014
    Hello all!

    So i was wondering, since the mini-jack has a wire for each channel, sent to each ear, is it possible to send these two wires to a microcontroller and send the channels as stereo to one side, or split them up and send as right and left, depending on conditions?
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    Well, microcontrollers deal with digital signals, so you can't feed the audio through a microcontroller unless you convert it to digital with an ADC (analogue-to-digital converter) then back again with a DAC (digital-to-analogue converter). This will affect the sound quality unless you use external converters, and in any case adds quite a lot of complexity.

    There are a few microcontrollers that include limited analogue processing capabilities in configurable analogue blocks, but these are the exception.

    A microcontroller can control circuitry that affects the signals that are fed to each earpiece. This circuitry could involve analogue switches (ICs), VCAs (voltage-controlled amplifiers), or even relays, to do the switching and mixing.
  3. BobK


    Jan 5, 2010
    You can connect both channels through resistors (1K would do) to a single input on a mono amp to get a mono out.

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