This circuit for frequencies up to a few tens of megahertz was found in the April 1978 issue of Radio Electronics magazine. The power supply must be symmetrical.
This circuit mimics the sound of a siren when we turn the axis of the small DC motor. The...
This filter is inserted between the interfering device and the interfering device. The coils are...
We found this circuit in a Radio & Electronics Constructor of November 1975. The magazine no...