Found in a 1968 Motorola manual, this DC circuit uses components from the era. The circuit fires in microsecond times. The Q3 transistor must be according to the controlled load.
This circuit, found in a 1994 publication, allows the use of two common analog telephone sets on a...
This circuit was found in an article in the December 1988 Radio Electronics magazine. The circuit has...
This circuit was obtained from a Popular Electronics of the 90's. Any power MOSFET can be used as...