Hi Brent,

this really sounds lie an interseting cicuit. Would appreciate
very much, if you could mail me a copy of it ;-))

kind regards
Reini OE3RDW

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Brent Brown
> Sent: Tuesday, November 30, 1999 5:26 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]: Need a simple 4-20mA transmitter circuit
>
>
> Hi Kelly,
>
> I made an analog output circuit that I used in a commercial product
> a few years ago. It's simple, cheap and works well. Uses one
> LM358 dual opamp, a few resistors, one cap, and 4 jumpers to
> select some common voltage and current ranges. Input may be 0-
> 5V analog or a 0-5V PWM.
>
> Sketched circuit in .GIF format is about 13k, emailed to you
> directly. This topic comes up often, so if enough other people were
> interested and didn't mind the bandwidth perhaps I could post it to
> the list.
>
> Kelly Schauf wrote:
> > To the forum:
> >
> > I am looking at a simple 4-20mA transmitter circuit that I
> need for an
> > industrial application.  Preferably, I am looking to do it
> with some form
> > of op-amp based circuitry. It is important to state at this
> time that the
> > Burr-Brown and Datel special purpose 4-20mA ICs have been
> ruled out due
> > to their expense.
> >
> > Any help given would be appreciated.
> >
> > Thank you,
> >
> > Kelly Schauf
> >
>
> Brent Brown
> Electronic Design Solutions
> 16 English Street
> Hamilton, New Zealand
> Ph/fax: +64 7 849 0069
> Mobile: 025 334 069
> eMail:  brent.brown@clear.net.nz
>