Avalanche Oscillator (CB7112E)

Found in a General Electric documentation from 1970, this circuit consists of a relaxation oscillator that uses a transistor from that time.

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Headphone Amplifier (CB4269E)
This hearing aid or stethoscope headset amplifier was found in a 1980s documentation. The...
TTL sine and square generator (CB9199E)
Found in Popular Electronics from the 90s, this circuit can generate signals from 1 to 10 MHz...
Ramp generator for stepper motors (CB21604E)
Based on the 555, this circuit was obtained from Internet documentation, serving to generate a...