In the circuit, the pulse generator used in triggering SCRs, UJT, 555, transistor astable multivibrator, etc. can. In the DC-powered circuit, the thyristors C are stopped by capacitor.
Pulse oscillator thyristors transmit in sequence. SCR1 cuts the electric charge SCR2 that has accumulated on C as it passes through. After C is discharged, this time it charges in the other direction. When triggering on SCR2, this element passes through. After SCR2 transmission, the electric load on C cuts SCR1. The circuit continues to operate this way. Two-way flow of currents from the primary coil wound at the mid-end creates AC voltage in the secondary.