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 was found in the June 1982 issue of Radio Electronics magazine. It provides reference...
With this source, it is possible to obtain a higher output voltage than that obtained by the...
This circuit was found in a 70s American documentation. The operational amplifier supports a modern...