chemelec
Well-Known Member
For Low Frequency Pickup, (Like listening to Heart Sounds) you can use a small Speaker as the Microphone.
For Better Operation you need an Impedance Matching Transformer or a suitable transistor circuit. Use an "Emitter Follower".
http://chemelec.com/Projects/Spkr-Mic/Spkr-mic.htm
For Better Operation you need an Impedance Matching Transformer or a suitable transistor circuit. Use an "Emitter Follower".
http://chemelec.com/Projects/Spkr-Mic/Spkr-mic.htm
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