This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
The purpose of this circuit is to add millivolt scales to a common multimeter. Used transistors are...
June 2017 - The new EEH-ZK (Type V) hybrid conductive polymer capacitors from Panasonic with...
This circuit can measure voltages from 0 to 10 V with a very high input resistance. The circuit is...