This circuit for the power grid was found in the June 1969 Radio Electronics magazine. The SCR and diodes are rated according to the power of the controlled load.
This circuit can be used as a shield for transmitting the temperature of a sensor. The circuit is from...
This simple circuit can make use of any general-purpose transistor. The power comes from the...
The circuit shown in the figure is suggested by Maxim (www.maxim-ic.com) and makes use of the...