741 200 mW Amplifier (CB25291E)

This general-purpose transistor audio amplifier was found in the March 1990 issue of Radio Electronics magazine. The power supply must be dual.

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Pulse Generator (CB21458E)
We found this circuit in a 1965 General Electric manual. The components are from the period. Time...
Variable Oscillator (CB23970E)
This 1-transistor Hartley oscillator generates an audio signal that is dependent on capacitor C1....
Light-Operated Switch (CB24048E)
This remote control or light-beam operated switch was found in the June 1970 Radio Electronics magazine....