Re: irf520 vs irf510
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Diver Martin <diver.martin@...>
I think I mentioned it before, but anyone seeking to drop in a Mitsubishi RDMos part should be aware that a) They're designed for 12V operation. You won't want to run them at 18V/etc b) They have a different pinout, you'll have to solder them in with the leads mangled/crossed. IRF510/20/30's are Gate-Drain-Source. The RDMos series are Gate-Source-Drain. This is a mod I still intend to try at some point, but have other projects on the plate first. c) They have a different bias voltage. Turn down the bias voltage before you key up, and then re-bias appropriately. If your IRF510's are biased at something like 4V when the bias voltage for the RDmos's are 2V (I'm making total wild assumptions, it could be the other way around), you'll instantly turn the devices on full-current and potentially blow something up. d) The feedback network will want to be different. These have much more gain at high frequencies. You may need more negative feedback. e) You can use an uninsulated grounded heatsink, as the tabs of the these devices is the source and not drain. I'm looking forward to hearing from someone who's done the mod and tried it out.
On Mon, Jan 15, 2018 at 10:52 AM, Tim Gorman <tgorman2@...> wrote: Dave, --
Martin Held - AE7EU http://ae7eu.com/ ------------------------------------------------------------------------------- If there aren't any questions, then what is there to learn?
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