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.
An excellent low frequency sine signal is produced by this oscillator. The frequency is determined by the...
Using the 4046 PLL integrated circuit, this circuit generates signals from 60 Hz to 1.4 kHz via...
This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz...