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- From: row0@ns1.cc.lehigh.edu (RICHARD O. WHITE)
- Newsgroups: sci.electronics
- Subject: Re: 0-38mV ==> 4-20mA Conversion
- Message-ID: <1992Nov19.181855.63992@ns1.cc.lehigh.edu>
- Date: 19 Nov 92 18:18:55 GMT
- Organization: Lehigh University
- Lines: 30
-
- In article <jtaylor.5.722100058@dseg.ti.com>, jtaylor@dseg.ti.com (Jeff Taylor)
- writes:
- >Can anyone suggest the best method (or design) to convert a 0 to 38 mV
- >pressure transducer signal to a 4 to 20 mA signal that I can send down
- >1000' of cable? I'm aware of the Burr Brown current transmitter devices,
- >but am seeking a simple op-amp solution. The BB chips need a much larger
- >voltage span as input.
- >
- >Thanks,
- >
- >Jeff : JTAYLOR@DSEG.TI.COM
- >
- Try 1-800-872-9436 OMEGA technical assistance.... nice outfit
- they carry exactly what you want at reasonable prices..
- also ask for their books or call 800-222-2665 hotline
- pressure-strain book has applications sections and product line data
- I'm not assocated or a rep.... just a satisfied customer....
- there are analog ckts avaible by Ti or Motorla ect if you wish to
- design your own.. but why reinvent the wheel... they went through the
- stability-noise-freq problems already..
-
- second thought voltage -> freg converter might be a little better....
- analog devices, intersil, might be a source .. I believe they have
- datat aqua. chips with front end gain to give 1000 to 1 v-f & f-v
- conversion...
-
- 1000' is a long antenna .....
-
- hope this helps.....
- --
-