NNTP-Posting-Date: Sat, 18 Jan 2003 13:41:25 -0600
From: Barry Lennox
Subject: Re: Simple adjustable 0 - 400V regulator, with flaw
Date: Sun, 19 Jan 2003 08:43:47 +1300
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On 18 Jan 2003 09:09:52 -0800, Winfield Hill
>> Winfield Hill wrote ...
>>> The Intersil HIP5600 is an adjustable three-terminal regulator
>>> that can be thought of as a 500V version of the LM317. I've
>>> used it in many of my lab instrument designs and found it to
>>> be reliable and, like the LM317, an elegant design simplifier.
> Close, Harry, but that resistor is happy enough. Keep looking.
> - Win
Two possible solutions,?
a. Use a 1 watt 1k5 resistor in series with the pot. That will help
take the "sting" out of the capacitor's charge.
b. Use a rotary 3 position switch, one end (fixed 300v) goes to the
fixed resistor, the middle position goes to a 1 watt resistor, say 4k7
to ground; and the other (2-400v variable) end goes to the pot. Then,
when switching from fixed to variable, you are forced to go through an
intermediate position that simply dumps the capacitor's charge.