This circuit was found in an American documentation two years 80. The MOSFET is of double port, difficult to obtain now and the circuit has a tuning frequency determined by RC.
We found this receiver on a single chip in the 1976 Siemens integrated circuits manual. The...
This circuit aims to take advantage of two old telephone sets in an efficient domestic intercom...
This somewhat complex circuit was found in the May 1984 issue of Radio Electronics magazine. The...