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From: "John Jardine"
Subject: Re: Don't do this! Just don't!
Date: Sun, 19 Jan 2003 21:17:12 -0000
NNTP-Posting-Date: 19 Jan 2003 21:02:51 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
John Larkin wrote in message
> 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.
I once watched on as a couple of our production guys farted about trying to
solder select-on-test surface mount resistors onto a pcb because of this
stupidity. Incredibly they'd also been supplied with a pre-calculated look
up table (beautfully printed and laminated) to make a 'best fit' ranging
selection before the pot was trimmed.
The lad who dreamed up this eletronic abortion actually turned a bright pink
colour on being shown the normal way.
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