Found in a Hands On Electronics from the 80's this circuit allows the reading of low resistances in a common multimeter. The circuit consists of a constant current source.
This circuit for analogue TV was found in an American 1980s documentation. The transistor can be any RF...
We found this circuit that warns when the gate of a house is opened in an old documentation,...
This proximity switch or approach relay uses only transistors and directly controls a Triac. The...