From: Spehro Pefhany
Subject: Re: Simple adjustable 0 - 400V regulator, with flaw
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
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Date: Mon, 20 Jan 2003 17:47:55 GMT
NNTP-Posting-Date: Mon, 20 Jan 2003 12:47:55 EST
On Mon, 20 Jan 2003 18:10:28 +0100, the renowned "Frank Bemelman"
>Yes, but you can't do it the other way, unless this pot
>has a double pole switch (is that DPST, I never understood
The one I mentioned has a SPDT switch ----o o----
aka changeover, form C etc.
But as Win pointed out- the power dissipation
capability is only 0.25W @70'C (which scales to 0.5W
at 47.5'C or 119'F), which might be marginal with the
HIP5600 in there. They are available in 1M, but that
would result in additional complexity. Also the
maximum AC voltage is 200VAC, which is a bit less than
it would see in this circuit. All in all, it would
be better to have a larger part than the 9mm type.
>What about a shaft with an indent, so that you feel
>a click at 300V. Oh, I can hear somebody complaining
>already - when I set it to 297V it jumps to 300V all
>by itself, what did I do wrong? Answer: you let go of
>the knob, now please don't do that, hehe.
>Another option is two pots in series, one for 0-300V and
>one for 300-400V.
Sounds too much like an etch-a-sketch.
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