This circuit was found in an Electronic Design from the 90's. It makes use of components from the time. Triac is according to the controlled load.
This circuit is from an American documentation from 1975. The single junction transistors can be...
This circuit, suggested by the Linear Applications Handbook of National Semiconductor, uses a very...
This circuit divides the voltage of a source by 2, allowing its use as a symmetrical source. In...