We found this circuit in the November 1992 issue of Radio Electronics magazine. The circuit has two integrated circuits, one of which is a preamplifier stage. The power supply must be dual.
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...
It can be obtained from Mouser Electronics, sensors (receivers) transmitters and benders for...