Voltage probe (CB8184E)

Found in a 90s Popular Electronics, this circuit uses general-purpose transistors, serving to indicate the polarity of circuits.

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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...