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 simple circuit has its trigger point set in the trimpot. The transistor can be any general...
This traditional triplier configuration with the 555 can be found in other articles on the...
This circuit is from a 1977 documentation. It is powered by the power supply of the circuit under...