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 battery charger was found in the Electronics Experimenter Special Projects of 1983. The...
This circuit is from an English magazine of 1974, but can still be assembled with the replacement of...
Motors up to 2 A DC can be controlled by this circuit that we find in the manual for linear...