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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Second Order Voice Filter (CB6544E)
Found on an 80's Radio Electronics, this circuit is designed to pass the 300 to 34,000 Hz voice...
Two transistors power stage (CB22249E)
Found in an American documentation from the 50's, this circuit uses two transistors of the time,...
Sinusoidal to Square Converter 741 (MSB017E)
This circuit converts sinusoidal signals to square. The upper limit of frequency is abour 100 kHz...