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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: MOSFET varieties
Date: Tue, 7 Jan 2025 18:59:33 -0000 (UTC)
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On Tue, 07 Jan 2025 08:22:37 -0800, john larkin wrote:

> On Tue, 7 Jan 2025 15:19:08 -0000 (UTC), Cursitor Doom
> <cd999666@notformail.com> wrote:
> 
>>Gentlemen,
>>
>>Is there a type of MOSFET which is normally 'on' with zero or low
>>positive gate voltage wrt source, but turns 'off' when Vgs is increased
>>to a higher positive 'threshold' value?
>>
>>CD
> 
> A p-channel JFET would do that.
> 
> Supertex makes some great depletion-mode NFETS, and someone else has
> equivalents. They make nice constant-current loads and current limiters.
> 
> What are you trying to do?

Thanks, John, but I don't want to start another lengthy thread here which 
would no doubt happen if I explained - and everyone chipping in a 
different idea so I end up losing track. So - no comment! :)