This circuit operates with an AM radio tuned to or near 900 kHz if there is a station at this location. The coil consists of 60 + 40 turns 28 on a ferrite rod.
Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine....
Found in the April 1995 issue of Electronics Now, this circuit operates at a lower frequency than...
This circuit is from a Radio Electronics magazine from May 1989. The source must be symmetrical, and other...