Dave, thanks. Probably wont have noticed myself. Saved hours of my time. /Ake Dave Tweed wrote: >Ake Hedman wrote: > =20 > >>I need some advice comments on this circuit=20 >>http://www.vscp.org/images/barometer001.gif You probably laugh your=20 >>guts out but but when you finished laughing please tell me what I have=20 >>done wrong. >> =20 >> > >You have the inputs to the opamp swapped. Another way of saying this >is that R4 needs to be the one connected to the opamp output and R3 >needs to be grounded. And also R2 needs to be 10K, not 100K. > >-- Dave Tweed > =20 > --=20 --- Ake Hedman (YAP - Yet Another Programmer) eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden Phone: (46) 657 413430 Cellular: (46) 73 84 84 102 Company home: http://www.eurosource.se =20 Kryddor/Te/Kaffe: http://www.brattberg.com Personal homepage: http://www.eurosource.se/akhe Automated home: http://www.vscp.org --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist