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 transistorized siren was found in Popular Electronics from April 1967. The signal must be...
In the figure we show a means of changing the output voltage of a fixed regulator, such as 7805 or...
In the figure we have a circuit of an analog computer published in the Radio Electronics magazine of...