some persons asked simple radio circuit diagrams.Here you can see very simple circuit diagram.When I tested this my first time I enjoyed very much.When the signals are coming you can here some sounds like ne ne nee nic nee nee nee nee.so test this and enjoy.
Note:
# Don't use more than 4.5V
# Build this on a pcb
#If the signals don't come move the main coil here and there then you can here some sounds.
# Firstly this circuit was designed by Elmer G. Osterhoudt in the early 30's
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