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Hearing Aid Pick-Up-Coil Circuits

  1. Feb 9, 2010 #1

    As the title suggests my query relates to hearing aid pick up coil circuits! I'm currently designing a small analogue listening device (a Transistor amplifier with a microphone input....simple!) however, I'm going beyond that and want to incorporate a small pick-up coil into the circuit, this would demonstrate 'Induction loops'. I have a good transistor amplifier circuit (3V supply) with AGC characteristics but I'm really having trouble finding an pick-up coil (telecoil) circuit...I exhausted google's stock of sites.

    Does anyone have a simple circuit (preferably 3V supply input)?


    (For reference, circuit 2 in the page below is the circuit I'm basing my microphone amp on)
  2. jcsd
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