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From: Spehro Pefhany
Subject: Re: Don't do this! Just don't!
X-Newsreader: Forte Agent 1.93/32.576 English (American)
Date: Sun, 19 Jan 2003 23:40:32 GMT
NNTP-Posting-Date: Sun, 19 Jan 2003 18:40:32 EST
On Sun, 19 Jan 2003 13:19:19 -0800, the renowned John Larkin
>On Sun, 19 Jan 2003 21:17:12 -0000, "John Jardine"
>>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.
>Funny; I like the laminated cheat-sheet. This is my second-favorite:
> | +------Rf---------+
> p | |
> o <---Ri----+---- (-) |
> t (out)-----+----Ro--- offset
> | gnd---(+)
> | opamp
This would be nicer, if you have a spare op-amp, no? Then
you don't have the Vos etc. from the opamp to such a
degree. Fixed output impedance of 49.9||10K, which is
> o <-------------- (+)
> t (out)-----x---10K--x- offset
> | x-----(-) | |
> | | | 49R9
> | | opamp | |
> | | | 0V
> | x-----------------x
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