This circuit takes advantage of the noise generated at the reverse biased junction of a germanium diode. Other types of diodes can be used. The signal is weak.
This circuit is from a 1972 Motorola publication. Some of the used transistors can still be found,...
The Texas Instruments PLLatinum ™ synthesizer can be obtained from Mouser Elecgtronics to generate...
This circuit has the function of automating some type of equipment when a powerful transmitter is activated...