Tubes and power supply

[Sasha Sekulich]

On Mon, 06 Apr 98 07:53:35 -0500, you wrote:

>Given a high enough DC bulk supply, there is a circuit for a high voltage 
>regulator in the National Linear data book, using the LM317 to regulate 
>hundreds of volts. The trick is that the regulator IC regulates current to 
>keep a given voltage, and the high voltage is kept from blowing the 
>chip by a series power mosfet which is biased 12V higher than the output 
>voltage by a zener. This sounds simplistic, but it works well, I've used
>it.

Thanks for the tip, I found it - but, of course, I found problems as
well. Would you (or anybody) know the replacement for that obscure
MOSFET mentioned there, NSD134? I guess any high-voltage power MOSFET
could be used, but then again...

TIA, Sasa
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Sasa Sekulic, student at the Fac. of Physics and Fac. of Philosophy
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