Bipolar Current Level Detector (CB6629E)

The circuit shown was found in an American documentation from 1964. The circuit uses transistors of the time and the indicators are small lamps.

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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...