Push pull amplifier (CB21941E)

Using a pair of CK722s, this booster step of a few milliwatts of power was obtained in a 1960 Gernsback publication.

Voice operated transmitter (CB20412E)
This transmitter kicks in when the microphone picks up sound. This sound then modulates the signal...
Varicap Variable Frequency Oscillator (CB13088E)
The great advantage of the circuit shown in the figure is the fact that its frequency is...
Twilight switch (CB24176E)
This circuit for incandescent lamps was found in the February 1972 Radio Electronics magazine. The triac is...