Rochelle Salt Crystal Microphone Hook-Up

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Two A.C. generators and 1 uf capacitor is added to run as simulation.  20 K resistor is where Rochelle Salt Crystal Microphone ( 10 to 100 mV output) would go.  Note microphone cable is shielded line in.  These microphones were sensitive to moisture and somewhat fragile.

Triode tubes that might be used were # 56, 27,37,76 with the heater circuit not shown in simulation.

Example of tube 56, is heater voltage 2.5 volts (A.C. or D.C.) at 1 amp. Plate current 2.5 to 5 milliamps for 13.8 amplification factor.

published 10 years ago

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