This circuit was found in an English documentation from the 90s. It uses a PLL CMOS 4046 and is powered by a 9 V battery. The sensors are two electrodes that must be held by the person.
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...