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How to connect audio to baby monitor bypassing mic?

Discussion in 'Audio' started by Geeman2000, Jul 22, 2015.

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  1. Geeman2000

    Geeman2000

    2
    0
    Jul 22, 2015
    Hi All,
    I have a Raspberry Pi configured to audibly enunciate movement around my property from outputs of reed switches and ir beams. I want to use a wireless audio baby monitor as a portable speaker.

    So I want to direct wire the audio output from the RPi into the listening module of the baby monitor via the microphone wires.

    Should I just direct connect or is some circuitry required?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,659
    2,019
    Nov 17, 2011
    The voltage level of a mcirophone is much lower than that of a raspberyy's output. You need to attenuate the signal e.g. using a resistive voltage divider. As I don't know the mic's level, I can only giess, but an attenuation of 1/1000 or higher should be necessary.

    You can achieve this by using a 100kΩ resistor and a 100Ω resistor in series, 100kΩ to the raspberyy's output, 100Ω to ground. Use a capacitor to decouple any remaining DC component. See this schematic:

    [​IMG]

    Use a potentiometer instead of the 100Ω resistor if the level is still too high and the audio is distorted. Adjust the potentimeter until the distortion is minimal.
     

    Attached Files:

  3. Geeman2000

    Geeman2000

    2
    0
    Jul 22, 2015
    Thanks for the reply, I'll try it later today.
     
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