This circuit was found in an American documentation from 1969. The circuit is a multi-indicator with resistors typically 47 k for R1 and 100 k for the others.
The sensors in this circuit are NTCs and PTCs that work in a differential way by directly...
This circuit was found in an 80's American documentation, serving only as a reference and not for...
This is an amplifier stage with a typical germanium transistor from the 60's to the 70's. The...