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A schematic of an impulse power supply

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Split841

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Anytime i want to build some power supply i have to have a transformer.IS there any solution to build some power supply without using a transformer?I was thinking about an pwm regulated power supply which uses triac(s) and the current coming right from the main source ( 230 V 50Hz).Does anybody of you ever build or heard about somethng like that?
 

mabye usefule:
**broken link removed**
 

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