12V double regulator (CB8810E)

We found this circuit in a 1966’s General Electric documentation. The circuit uses diodes in unique GE packages, available at the time.

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Logic Probe (CB10026E)
This circuit was found in old documentation but uses components that are still common. The circuit...
Over-temperature alarm (CB10485E)
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...
Sensor with thermocouple for Celsius scale (CB10175E)
This calibrated circuit was found in documentation from the 1980s. It makes use of an integrated circuit...