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.
Using the LM0101 IC this amplifier was found in October 1982 Radio Electronics magazine. The...
This symmetrical power supply uses regulators from the 78xx and 79xx series and can be adapted to supply...
This variable frequency oscillator (VFO or OFV) was obtained in an old Motorola documentation. The integrated...