re: 4-20ma Current Loop Transmitter

   Hennie, Burr-Brown has supplied these kind of ICs for years. Check out
their XTR105. You can reach them at:

      800-548-6132
      http://www.burr-brown.com

   - Tom

At 11:36 AM 7/2/97 GMT+200, you wrote:
>I am thinking of using a microcontroller (perhaps a PIC) in an industrial
> project.
>The controller would have to interface with  0 to 20mA analogue input and
>output signals.  Does anybody know of an IC(s) that does current-to-voltage
>conversion and vica versa, perhaps with the use of one or two passive
>components?  I am looking for alternatives to using opamps.
>
>Any suggestions/comments/advice appreciated.
>
>Hennie Swanepoel