Today this frequency corresponds to the end of the FM band. However, in December 1958, when the circuit was published in Radio Electronics magazine it was the frequency used by American satellites.
This high voltage source supplies at its output a voltage that is six times the value of the peak...
With an optical coupler and a power transistor, which can be the BD135, it is possible to control...
This circuit is activated by the ignition key which, when removed, makes a relay beep if the...