This circuit allows the use of an electret microphone with a 1.5 V source. We found it in the Encyclopedia of Electronic Circuits volume 5 from 1995.
This symmetrical power supply appears in our section in many versions. This one is from the Radio...
To protect your home, vehicles or even objects, what we present is a sensitive alarm circuit that...
This counter was found in the November 19983 issue of Radio Electronics magazine. The power supply...