Bath control (CB21373E)

This hydromassage circuit was found in a 1967 General Electric publication. The SCR is according to the power of the heating element.

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LED Scale Transducer U237B (CB25441E)
This circuit with a component from the time was found in the Radio Electronics magazine of...
Bridge amplifier (CB9058E)
Using two LM377s, this amplifier provides a few watts of audio in a low impedance speaker and the power...
Irrigation Pump (CB18084E)
This circuit is from 2005 documentation. It automatically starts an irrigation pump when the...