The last time I told this story on this list, I was labeled a "cow tipper". Which to this day I mostly deny. But time for it again. When I was in High School and taking a driver's training course, we were driving on a back country road. There were four of us kids in the car and only one was driving, so we had some time to fill. We seen this cow laying out in the field and the conversation turned to "Was the cow dead or just laying down." As none of us had any social interest in the cow, we didn't stop go out in the field and check. But the conversation continued about cows and the meaning of life and a cow laying on the ground. At some point, the driving instructor tired of this conversation. So he assigned me the noble task of researching just how cows laid down. And to present a verbal report next week during the driving class. I did the research and reported the next week. I learned a lot doing the research. A great experience and one I remember, even 40 years later. Now you ask a question that is well within your ability to answer yourself. Get your parts and a solderless bread board and see what it does. Change some of the values and see what happens. Play with it. learn from it. Then if there is something strange you found, ask about the strangeness. I said it straight, I said it with love. Must have read too many replies from my hero Olin and it has affected me. Bill ----- Original Message ----- From: "Chuck Harkness" To: "Microcontroller discussion list - Public." Sent: Wednesday, November 10, 2004 1:42 PM Subject: [EE] Newbie - am I thinking right about opamp input Am I thinking right regarding the following: Single supply opamp, such as MCP601 Input of -0.1 to +0.1 Gain of 10 using Rin=1K ohms to inverting input, Rfeedback=10K ohms. Bias = 0.2V to non-inverting input Resulting output of 1.2V to 3.2 Am I right in thinking that, although the input might be negative 0.1, the voltage at the inverting input to the opamp will never be below positive 0.2, so I am within the input specs of the opamp, so the output will be linear from 1.2V to 3.2V? TIA Chuck _______________________________________________ http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist