Burkhard Kainka
About the article

Electronic Stethoscope

LABSPROJECT
Based on a Labs project | October 2011 | Find it here
In order to listen to your heartbeat you would normally use a listening tube or stethoscope. This circuit uses a piezo sounder from a musical greetings card or melody generator, as a microphone. This transducer has an output signal in the order of 100 mV and its low frequency response is governed by the input impedance of the amplifier. For this reason we have chosen to use an emitter follower transistor amplifier.
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