Analog switch (CB21253E)

This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern equivalents.

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Light-Operated Lamp (CB23961E)
This circuit appeared in the July 1969 issue of Radio Electronics magazine. The sensor is an LDR....
Control for pacemakers (CB7881E)
This circuit was found in an American medical documentation from 1970. The circuit rejects the 60 Hz...
Flip Flop Neon (CB23610E)
This is a basic flip flop circuit with neon lights. We found it in a Radio Electronics magazine from...