Crystal Radio

 

A 741 mini-power-amplifier can update those 1N34 “cat’s whiskers” crystal receivers right into the Space Age. Depending on antenna and ground facilities, good reception is possible with clear volume from the tiny speaker. A 9-volt transistor battery provides portable radio convenience for escaping the frustrations of the IC experimental test bench.

 

Copyright by Bill Bytheway, K7TTY February 2012