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 can be used with 3 receivers and is intended for low frequencies (medium wave range). We...
Using two of the 4 NAND gates of the integrated 4001, the circuit in the figure activates the...
This circuit allows you to superimpose the signal from the microphone to that of the music with...