TTL Oscillator (CB21119E)

This 1 kHz TTL oscillator uses 3 inverters of a 7404 integrated circuit. The circuit is from a Popular Electronics from the 90s.

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Stabilized Colpitts Oscillator (CB22395E)
This Colpitts oscillator with JFET has the amplitude of the signals stabilized by a diode. The...
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Overvoltage and Undervoltage Relay (CB17023E)
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