> RE: CS>MultiMeter Question
> From: David Bearrow
> Date: Wed, 7 May 2003 19:17:09
> You can say what you like and calculate it all day long but it
> doesn't change the fact that I consistently get 1.7ma from a LM317
> with a 1K resister. I have built 10 machines this way and everyone
> of them limit the current to 1.7ma.
[...]
> Dave
Dave,
Ignorance is True Bliss. 10 machines? Are you going into business?
I'm all in favor of getting the word on cs out, but if you think you
can get away with operating a device outside it's spec, it will
eventually catch up with you.
Why not try the LM334? It is guaranteed to work in your current
range:
http://www.national.com/ds.cgi/LM/LM134.pdf
Or if that's too easy, why not design your own constant current
circuit like this one?
http://www.sotainstruments.com/images/ccacircuit.jpg
(SOTA can't claim ownership of that - it's been around since the
dawn of time, and I have used it since 1969.)
Best Regards,
Mike Monett
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