This circuit is designed to measure very weak currents, in the order of picoamperes. We found it in an American documentation from the 80s. The integrated circuit is from that time.
This voltage-controlled oscillator generates signals from 0 to 1.4 kHz with the components...
This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit...
Found in technical documentation from National Semiconductor, this circuit provides a voltage of...