This receiver was found in an article in Electronics Now magazine in March 1994. The coils are critical, as shown in the figure. Listening is through headphones.
This is yet another simple LED driving game circuit that appears in several other versions on this site....
This circuit, from the ON Semiconductor Thyristor Manual, controls both the speed and direction of...
This polarity inverter circuit for voltages down to about -12 V was found in the December 1992...