This transformerless 16-ohm speaker circuit was found in a Radio Electronics from October 1963. The circuit is powered by 12 V and the gain is 50 dB.
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...