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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Fluorescent Rhythm Light For the Car (CB3810E)
This 1987 circuit uses a common ignition coil to generate high voltage to power a fluorescent lamp that...
Electronic Drums (CB26221E)
The sound of drums can be obtained with these two touch-triggered double-T oscillators. The...
Photodiode Comparator (CB20688E)
This high-precision circuit was found in documentation from the 1990s. The integrated circuit is...