This circuit was found in an EDN from the 90s. The circuit employs a double 555 and uses the courtesy light switches of the car as sensors.
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...