big_tobacco
- 6
- 0
Hello,
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)?
Thanks
(For reference, circuit 2 in the page below is the circuit I'm basing my microphone amp on)
http://www.talkingelectronics.com/projects/HearingAid-2/HearingAid-2.html
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)?
Thanks
(For reference, circuit 2 in the page below is the circuit I'm basing my microphone amp on)
http://www.talkingelectronics.com/projects/HearingAid-2/HearingAid-2.html