Tag: OPA172IDBR

Low noise Mini Electret Microphone PreAmplifier

Low noise Mini Electret Microphone PreAmplifier

This single supply microphone pre-amplifier amplifies the output signal of an electret capsule microphone to audio line levels. An op-amp is used as a trans-impedance amplifier to convert the output current from the microphone into a signal-level voltage. The circuit works with 9V so...

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