Economic radar detector (CB8629E)

Found in a 90s Radio Electronics, this circuit uses a ceramic capacitor (C1) as a sensor. The operational amplifier is a double 741 of the time.

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Calibrator for cassette tape recorder (CB8772E)
Found in a Radio Electronics from the 90s, this circuit generates a 1 kHz signal to serve as a...
Sampling and hold (CB8416E)
This circuit for demonstrating a sampling and holding configuration was found in a Popular...
Earphones Amplifier (CB838E)
This low Power simple amplifier is intended to the use with high impedance phones. The circuit is...