This is a Tesla coil circuit. A transformer steps up the input voltage by a factor of 100 to create a high voltage. After a few seconds, the voltage becomes high enough to fire the spark gap. The capacitor and the primary winding of the second transformer form a resonant circuit. The secondary winding of the transformer is attached to a toroid, represented here by a capacitor connected to ground. It also forms a resonant circuit with the same resonant frequency, about 200 kHz. Energy is gradually transferred from the first circuit to the second, and then the spark gap stops conducting, leaving all the energy in the toroid circuit. Once the spark gap stops conducting current, it takes some time for the voltage to build up enough for it to fire again. The simulation speed has been slowed down a bit so that the 200 kHz oscillations can be seen. You may want to reload the circuit instead of waiting.
This page is a utility for simulating катушка тесла online with specified initial values.









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