Temperature to frequency converter (CB7325E)

This circuit was obtained in a Radio Electronics of the 90s. The circuit uses an integrated circuit that is not common today.

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20 to 20 kHz 741 Oscillator (CB13844E)
We found this circuit in an American technical documentation from 1974. The circuit can generate...
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This circuit consists of an electret microphone amplifier powered by a 12 V voltage. A regulator is...