• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Inverted Mos HV soft start

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richwalters

richwalters

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Joined 2003
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.

:att'n: 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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