Amplifier stage (CB21940E)

This circuit with germanium transistors was found in a publication by Gernsback from 1960. The circuit is low power, a few tens of milliwatts.

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Wien Bridge Oscillator (CB9040E)
This circuit has a frequency range of 30 Hz to 100 kHz with an output signal of 1 Vrms. We found...
AC Phototransistor (CIR812E)
This circuit is suggested by the Optoelectronics Sourcebook by Texas Instruments when AC signals...
Traffic Light (CB21013E)
This sequential relay actuation system circuit for traffic lights was found in Electronics Now...