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Old 5th January 2009, 07:28 AM   #1
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Join Date: Sep 2003
Location: Alps:Tube amp designs over 150W, SMPS guru.
Default Inverted Mos HV soft start

I get alot of queries from many constructors who cannot abide the concept of using an "n" ch inverted mosfet in the neg leg of a fullwave psu for soft start. The relay coil can be connected to a neg line, a simple B+ self protect for grid bias failure. The possibilities are endless.
So here it is. The power mosfet requires ferrite beads and a snubber (to avoid squegging) can be reclaimed from an old tv line stage and the component ratings obviously rated for the voltages.

I claim no originality for this simple design, only to mention those who meddle with high voltages, know the danger to life darein. It's your life !

richj
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