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.
In this circuit the capacitor under test is charged at switch position A and then discharged...
Found in a Motorola manual from the 1980s, this circuit uses components from the era. The circuit...
This high-gain amplifier was found in the March 1994 issue of Electronics Now magazine. The...