By hvhipot 
Series resonant circuit is an important device in receiving and transmitting equipment as well as other circuits of electronic devices.
In order to meet the conditions for resonance to begin, it is necessary to make the reactance of the inductor correspond to the reactance of the capacitor, at which point the active resistance of the circuit composed of chains L and C will be minimized. If the natural frequency of this circuit is consistent with the frequency of the power supply voltage, voltage resonance will occur. In this case, the maximum allowable current will flow in the series resonant circuit.
Under these conditions, the accumulated energy of the magnetic field is converted into the potential energy of the capacitor, and then converted in reverse order. Therefore, the entire circuit of the circuit is closed by the AC voltage series resonance, and subsequently, the current flowing in the circuit increases to its maximum value. When the loop inductance changes or the power frequency changes, resonance disappears based on Ohm’s law in the circuit section.
The connection diagram includes:
• Comes from an AC power series resonance and is included in its circuit;
• Capacity;
• Inductors.
This inclusion characterizes the resistance of an AC voltage circuit, which forms a loss in the coils of a resonant circuit. This loss is composed of the losses in the wires and frames of the circuit’s coils, as well as the dielectric and radiation of the capacitors.
Series resonant circuits are widely used in signal filtering circuits, where active suppression of parasitic frequencies and isolation of useful signal frequencies, as well as phase rotation of resonance, resistance conversion, etc.