Random neon (CB7082E)

This circuit causes the neon lamps in a set to flash randomly. Capacitors determine the speed of blinks. The supply must be made with high voltage.

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Null Detector (CB5071E)
We found this circuit in an American 1980s documentation. Transistors may be general purpose...
Receiver for Modulated Light (CB790E)
The circuit shown can be used in an audio link using visible light or IR. Any photo transistor can be...
Sound receiver (CB8231E)
Indicated by a 90s Popular Electronics, this circuit amplifies acoustic signals for analysis on an...