This circuit was found in a 1967 Japanese documentation. It consists of a touch control system with two transistors from the time. The circuit uses a power source and sensitive relays.
Unlike white noise, pink noise has a spectrum whose amplitude decreases with frequency. This...
We found this circuit in the April 1992 issue of Radio Electronics magazine. The circuit uses an...
This circuit sends its signals through a wall acting as an FM spy. The circuit is from an...