This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974. Transistors are common types at the time.
This circuit, found in a 1989 publication, only works with incandescent lamps. The maximum power...
This circuit is intended to reinforce old car radios, having been found in 1997. At that time,...
The circuit of the figure consists of a motor timer that can delay drives for up to 15 minutes....