This circuit was found in an American 1980s documentation. It analyzes the exhaust gas of a vehicle using a special sensor. The indicator is a milliamperimeter.
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
This low power two-phase motor control was obtained in a 1989 publication. The circuit is for...
This circuit was found in European documentation from the 1980s. The unijunction may be 2N2646 and the...