Found in a 1968 EEE, this switch controls a high-power load from an audio signal. The current is determined by the type of SCR.
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...