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From: "Frank Bemelman"
Subject: Re: Don't do this! Just don't!
Date: Sun, 19 Jan 2003 23:23:28 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Organization: EuroNet Internet
NNTP-Posting-Date: 19 Jan 2003 22:24:59 GMT
"John Larkin" schreef in
> OK, every once in a while we need to have a trimpot crank in a little
> bit of DC offset into an opamp or something, and there are those nice
> +-15 or whatever power rails handy. But I see so many presumably
> intelligent engineers do something like this:
> 100r O <-------- small offset
> This is a *very*bad*idea*. I recent sold a bunch of
> amplifier/discriminator boxes because somebody else did this, among
> other dumb things.
> So quit doing this. Just quit it.
Ha! I never use pots ;) Well almost. Sometimes for gain.
But if I had to make an offset circuit, my first prototype
would use the circuit above. And if the prototype didn't
reveal any problems, it would end up in the final thing.
But I would choose a smaller ratio between resistor and pot,
to make sure the pot has a large enough range. 10K and 1K pot
I'm looking forward to hear why it is bad practice ;)
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