Timer for enlargers (CB8301E)

From the time when photographs developed on paper could be enlarged, this circuit was found in a 1960s General Electric documentation.

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Treble Booster (CB12322E)
We found this trebble booster circuit in a 1990 documentation. The components are current, and the...
Water Level Monitor and Control (CB6271E)
This circuit was found in an 80s Hands On Electronics. It senses the water level in a reservoir by...
Linear optical receiver for 50 kHz (CB7423E)
This circuit was found in General Electric documentation from the 1980s. The circuit is intended...