Remote potentiometer (CB8326E)

This circuit came out in a 60s RCA documentation. The circuit uses common lamps and LDRs but can be implemented with LEDs.

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Memory sensor amplifier (CB6809E)
This circuit is from a 1967 documentation. It consists of a sensor for memories used at the time....
10W Amplifier LM1875 (CB25523E)
We found this circuit in the November 1992 issue of Radio Electronics magazine. The circuit has...
Flasher with two settings (CB6802E)
Found in EEE documentation, this circuit can have the duration and frequency adjusted separately....