Heavy Duty Mosfet switching circuit..........

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Could someone point me to a good opto-isolated mosfet switching circuit. I`m looking for something that will afford a little more protection than just switching a fet. I have seen in the past elaborate circuits with snubber diodes, caps,resistors,est. Maybe someone makes a prefab module ? I need to switch 200vdc at around 5 amps in the 40,000khz range.

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Bob Boyce's HD circuitry.

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I study everything Bob Boyce. I don`t know what you mean.

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Did you ever get a look at his heavy duty version?
His circuits all have external input ports.I cant remember the FET's he used for that one , the FETS I have are  IRFPS3810, those were for one of his boards but I cant remember wich one....Ive been looking every where for any of his schematics past rev.c and cant find nutjing but express pcb files.Ive been busting my non electronics ass for over a month now trying to find a good simple variable frequency triangle wave ,negative ramp and sawtooth circuits but have consinstantly failed and am at witts end with just those simple frickin circuits.ANY help with a simple constant amplitude triangle wave and a negative ramp circuit will be much appreciated and I will most deffinately share the resulting circuitry and wave form I think alot of us will be interested in.

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i use igbt rated at 96 amps 600v i don~t remember the name now... and its not really important for you becasuse probably it won~t be available...

you must get the list of your local suplier to chose the better one or your tests, theres no one fits all solution but the greatest is the voltage and amps the better...

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I was looking for something opto-isolated to afford a little more protection for a freq. generator I cherish a lot. Maybe you could sketch something up for me ?   

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Bobs boards are opto-isolated, the last version i had used the pcp116 opotos.

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Yes Bob`s boards are opto-isolated. I have them all but the hex controller. Problem is they output about 12vdc. I want to pulse 200+ vdc, 5amps at around 42,000khz.