The idea of this circuit found in a Radio Electronics from January 1966. The idea of the circuit is to improve the reception of audio signals, mainly telegraphy, working as a filter.
This transmitter, indicated for espionage applications, is permanently powered by the power grid....
The maximum frequency of the oscillator shown in figure 10 is on the order of 5 MHz, depending on the...
This circuit was found in the SGS manual of linear integrated circuits of 1982. The integrated circuit...