We found this circuit in the September 1994 issue of Electronics Now magazine. The circuit uses off-the-shelf components and is powered by mains power.
This oscillator has its frequency controlled by crystal and its frequency can be between 100 kHz...
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. The...