Transistorized AM radio (CB8392E)

Found in a 1980s amateur radio QST magazine, this is the conventional circuit of a medium-wave radio. Coils and transformers are commercial types.

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Light pulse analyzer (CB8300E)
Originally designed to analyze the shape of light pulses from a flash for photographic...
Oscillator 4001 (CB14985E)
This CMOS oscillator circuit generates signals up to a few megahertz, depending on the capacitor value....
Variable Wien Bridge Oscillator (CB25964E)
Generating sinusoidal signals from 1.5 to 15 kHz, this oscillator uses common complementary...