PCM switching (CB9403E)

Using a tunnel diode, this circuit was found in a 1966 American publication. The circuit is for signals sampled at a speed of 8,000 sps.

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Light Controlled Oscillator (CB4717E)
This circuit can function as a light alarm by changing the sound when light falls on the sensor....
Linear Sawtooth Generator (CB25678E)
Based on a unijunction transistor, this circuit was found in the January 1994 issue of Electronics Now...
Pulsing Tone Generator 4001 (CB10744E)
Although it is a common configuration today, these circuits were taken from an old publication. The...