To maintain undamped electromagnetic oscillations, it is necessary to replenish the energy reserves in the circuit by periodically connecting the capacitor to a direct current source. The transistor acts as a high-speed “key”. The control signal to the base of the transistor will be supplied from the oscillatory circuit through the coil and capacitor.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.