Rlc-oscillator

  
A positive transient, such as the power switch closing, charges r through L to a voltage above the supply voltage, if Q is sufficient. When the current reverses, the diode blocks and triggers the SCS. As the capacitor discharges, the anode gate approaches ground potential, depriving the anode of holding current.
Rlc-oscillator - schematic

This turns off the SCS, and C charges to repeat the cycle.




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