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 must be powered by a symmetrical source and has a very high input impedance. The...
This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The...
This circuit serves to prevent devices powered by 6 V from being left with a power cut. The...