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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Signal Follower with Old Transistors (CB12922E)
This signal follower, from a publication from the 1970s, uses old germanium transistors such as...
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Fluorescent Lamps Test (CB18603E)
The presented circuit is used to test ordinary fluorescent lamps. This circuit also has a mains...