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.
September 2017 - Texas Instruments PCM186x and PCM186x-Q1 Audio ADCs can be found at Mouser...
This circuit came out in an American magazine that no longer exists. It's the Electronic...
This circuit uses the Linear Technology LT6505 and was found in a 2005 manual. The circuit is for 24 V...