On Mon, 28 Oct 1996, Rob BRUCE-BRAND wrote:

> I'd appreciate some ideas on a precision, temperature-stable current
> to voltage circuit to convert e.g. a 4-20mA signal to a 0-5V signal
> (which I will then feed into a Voltage-to-freq converter and read
> with a uP).
>

I think you are looking for a resistor: U = f(I) = R * I   :-)

If you want to convert 0-20mA to 0-5V you choose a value of about
250 Ohm. But be sure to get a resistor with a low TEMPCO (oh, what's just
the english expression for 'Temperatur - Koeffizient') ?). I think
precision  metal-film resistors have a TEMPCO of about 20 ppm/(degree
kelvin) or even lower. Hope that's good anough.

Q'uapla

PS.: I hope you understand what I wrote, because I couldn't find all the
words I wasn't sure about in my 'Langenscheidts'-dictionary :-(

Bernhard Schweighofer alias schweigi@sbox.tu-graz.ac.at
(Student at Graz University of Technology, Austria)