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 filter was found in the May 1989 issue of Radio Electronics magazine. The power supply must...
Depending on the key pressed, this oscillator produces a different tone, set in the corresponding...
The 1 kHz Wien bridge oscillator presented was found in the 1993 Linear Technology Applications. The...