In electronic circuits, make full use of the switching role of transistors, use the inductive energy storage and the capacitor charge and discharge principle, the stored electrical energy into the inductive magnetic energy, and then turn the magnetic energy into electrical energy.
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The transistor replaces the switch in the circuit to supplement the energy, and the time to supplement the energy is determined by the feedback part of the LC oscillation itself, so that it can be rhythmically supplemented to obtain the resonance.