This hydromassage circuit was found in a 1967 General Electric publication. The SCR is according to the power of the heating element.
With the coded activation of the relays, it is possible to control which of the 16 outputs...
The integrated circuit used in this application is not very common. Transistors and resistors...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...