This circuit can be used with motors or resistive loads, such as heaters and incandescent lamps. The circuit is from Popular Electronics from the 90s. All components used are common.
This circuit was found in an American telecommunications documentation from the 1980s. The circuit...
This circuit is from a 1970 publication. The time constant is given by 1.3R x C where R is the...
This 18 V x 300 mA power supply was found in a 1969 documentation. The integrated circuit is...