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.
May 2016 - It can be obtained from Mouser Electronics new display 1092 from VDC. The new LED...
This circuit generates circles on the screen of an oscilloscope. The circuit is from old...
This old configuration using a germanium transistor was designed to operate with variable...