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Improvement, best practices, lessons learned

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Adding a microphone

First  outcome of Jonathan's tests and Karyns comments is that it would be useful to implement a microphone in the device to provide means to record the experimenter questions alongside with the spirit signal.

Technically this should be done with an

  • electret condenser microphone capsule built into the frontpanel
  • the usual transistor preamplifier
  • a second OpAmp to mix the noise signal from the phototransistor with the microphone
  • Microphone level adjustment is needed->another potentiometer
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