From: firstname.lastname@example.org (N. Thornton)
Subject: Re: How to make/solder a circuit fast?
Date: 30 Sep 2002 03:42:19 -0700
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: 30 Sep 2002 10:42:19 GMT
email@example.com (The little lost angel) wrote in message news:<firstname.lastname@example.org>...
> On 29 Sep 2002 06:15:32 -0700, email@example.com (N. Thornton) wrote:
> >It sounds easy to use an opamp to amplify that upto easily measured
> How much distortion/inaccuracy would an opamp add? I haven't quite
> figured this precision thingy. If I would to multiply that +/- 5% for
> every thing in the circuit, I find myself with something that's wholly
Nothing like that, no. We're talking less than 0.00 something percent.
A good quality opamp really is good quality. Go for one designed for
instrumentation, with very low offset voltage/current. Certainly don't
touch things like 741, 324, those sort of things are just cheapies.
A few numbers for you to look at the specs/availability on:
If you want a good source of understanding and ready designed
curcuits, check out National's AN Application notes, they're online,
and very good too.
> >Can't you use a row of parallel pieces of mains cable? Or if you want
> >ready-made thick, a set of car jump-starting leads.
> Well... I already got the shunts so kinda no longer an issue to worry
> about the main leads. Plus, a whole set of them costs about the same
> as those car cables with huge clips.
Well, I know you've got your shunt, I was just thinking something that
gives you 10x the Vdrop might make life much easier for you, and help
keep your inaccuracies right down, and avoid spurious pickup of
> >Lol, you like sticking your tongue out :)
> Habit in real life :P
> Friends say it looks cute, and since I tend to make all kinds of
> klutzy silly careless mistakes, it helps to defuse irritation for the
> folks around! :pPPpP