This circuit was obtained from an American technical manual from the 80's. The integrated circuit is an operational of the time that can be replaced by a modern equivalent.
The transistor may be the BC548 in this circuit for low frequency signals. We found it in an old...
daptation of a common multimeter for the measurement of high voltages with high input resistance,...
Flybacks are no longer misused. However, if the reader wants to recover an old analog television...