This is the receiver for the previous circuit found in the November 1991 Radio Electronics magazine. The frequency is 2.2 MHz determined by the coils.
This circuit is a documentation of the 70's and therefore valid for analog lines. What the circuit...
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...
This circuit was published in a 1983 English magazine, but it can be easily assembled using BC548...