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 generates signals with two waveforms. The circuit is from a documentation from the...
This circuit was found in an 80's Radio Electronics. The circuit multiplies the frequency of a low...
Found in Electronics Now from the 1980s, this amplifier can also be seen in commercial amplifiers...