the _MR printed circuit board

a practical noise reduction system Last month we promised to come up with a practical noise reduction system that avoids using a 'hard- to-get' IC — and here it is. The circuit literally makes noise go 'off the air'. In addition to the usual HiFi applications, the circuit can be used to 'brush up' the sound quality of old records. They no longer need to be discarded because of the grating noise that made listening to favourites of years gone by almost unbearable. The same goes for FM radio: remote stations will sound much clearer once noise is eliminated.