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Low voltage DC to High Voltage DC Circuit Explanation

This is a circuit for switching the transformer at high frequency and so that we get ac on the secondary side. A voltage multiplier circuit is connected to the secondary of the transformer which will give a high voltage dc at the output. That dc voltage is then fedback which is shown in the figure as OUTPUT FEEDBACK. In this circuit i am not able to understand

  1. the use of 220microFarad capacitor which is connected with the centre tap of the transformer

  2. How is feedback circuit working, Is it a window comparator circuit?

  3. Use of transistor, I mean the Square wave which we are getting can be directly fed to the Mosfet but why have we used transistors?

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