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well regulated 300v, 200mA PSU

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ash

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Hi all,
How can i design a well regulated 300V 200mA DC power supply? I found a circuit with lm317, it converts 9v dc to 250v dc without transformer, but my harddisk crashed. It was very useful circuit but i can't find the shematic again, named 317high.pdf . When i use capacitor to regulate 220v ac, i should use very big capacitor and it's more expensive.
 

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