This circuit was found in the January 1999 issue of Electronics Now magazine. The circuit uses an integrated circuit from the period and has earphone listening.
In a reflex receiver, the detected audio signal is applied back to the circuit input to receive new...
This circuit is from 1991 but can be assembled with a 2N2646 unijunction transistor. When turned on,...
We found this circuit in a 1989 Radio Electronics. The circuit can be implemented with other...