Geiger Pulsating Indicator (CB23617E)

This circuit is a suggestion from a Radio Electronics from October 1964. We found it in the patent section.

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Modulated Oscillator 4093 (CB17577E)
Photometer (CB7360E)
This 1964 Electronic Design circuit uses a photo-FET as a sensor. The component is rare today. |...
Limit Detector (CB5163E)
This two-input limit detector was found in an American 1980s documentation. The circuit can be...