Light out switch (CB8331E)

This highly sensitive circuit was found in a 1967 General Electric SCR manual. Equivalent components can be used.

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Fluid Flow Monitor (CB12461E)
This circuit is from a 1995 technical documentation. The transistor can be a BC558 and the sensor...
Telephone line tester (CB8710E)
Found in a Popular Electronics from the 90s, this circuit checks the presence of voltage on a...
Old Phonograph Amplifier (CB1416E)
The critical component of this amplifier is the output transformer. We found the circuit in an old...