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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Telephone recording circuit (CB21270E)
Found in an American documentation, this circuit shows how an interface should be made for...
Dip Oscillator (CB23884E)
This oscillator for testing resonant circuits was found in a Radio Electronics magazine from June...
Function Generator MC3403 (CB15265E)
The operation of this circuit is not common today, but equivalents can be experienced. The circuit is...