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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: LTSpice model for a SiC MOSFET
Date: Thu, 22 May 2025 07:36:28 -0700
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On Thu, 22 May 2025 09:44:30 +0100, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

>john larkin <jl@glen--canyon.com> wrote:
>
>[...]
>> Going from 1KV to 3.3v has interesting possibilities. The easy way is
>> a resistor and a zener. Efficiency about 0.3%.
>
>Roughly 1W dissipation per mA , so if the current requirement isn't too
>high, that is probably the most straightforward system with very little
>to go wrong. 
>
>
>> More efficient would be a resistor and a zener and then a buck
>> switcher. 5% maybe.
>
>That's a lot of extra complication for very little improvement, the
>resistor still has to carry the full load current.
>
>For a cult market you could use an 807 and tap the 3.3v off the cathode
>bias resistor.  (or better still, rectify the heater supply and use a
>linear regulator but don't tell the customer).

I never liked 807's. Ugly tubes.

https://www.dropbox.com/scl/fi/jaaw4dk4d4gm0api2h36r/833.jpg?rlkey=ajc90k4hw35lbwilfoph8qbmc&raw=1


Imagine a buck switcher with  two HV npn's and one CCFL transformer as
both the main inductor and the base driver.