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 driving a pump when needed.

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Target Shooting (CB18207E)
These simple weapon and target circuits with emitter and photoelectric sensor were found in a 1985...
Thermocouple amplifier (CB3938E)
We found this circuit in an old publication dealing with operational amplifiers. The circuit uses...
Thyratron Replacement (CB6560E)
Suggested by General Electric in a 1967 documentation, this circuit replaces the Thryraton tubes used at...