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.
Indicated by Popular Electronics to be used with a car headlight, this circuit can also have...
This simple amplifier stage with a transistor has a linear response from 25 Hz to 120 kHz. The...
Motorola's integrated circuit used in this' 70s amplifier is no longer common today. Neither do...