We found this circuit in an old Mullard (Philips) documentation. The sensor consists of a reed-switch that is coupled to a magnet on one of the wheels of the vehicle.
This circuit drives a buzzer or electric buzzer but can be used to trigger a relay or other load....
Found in Popular Electronics from the 90s, this circuit can be used for high voltage applications and...
August 2016 - The new Schottky diodes from Vishay's ESMP series for surface mounting can now be...