IFD:Printing Acoustic Interfaces/acoustic sensing circuits

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< IFD:Printing Acoustic Interfaces

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transformer microphone and 555 timer oscillator (outdated circuits)

Full Circuit

TL072 Version

TL074 Version

One Sending and two Receiving Circuits

Printed Capacitive (Condenser) Microphone

Charge Mode Amplifier for Capacitive Microphone

275kHz Receiver

309 kHz Receiver

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