I am wondering if anyone know any good webpages that describes different op couplings for creating +/- x V from x V. Or have any advice on the following problem;
I am having a bit of a problem getting a circuit working, need to get up to 5V totally between E+ and E- in the following circuit with a Vref of +2,5V. I use rail-to-rail op´s, feeding +/-5V but no success getting any more than 4,6V.
I thought that if I had a reference of say, 2,5V, in on the top op-amp non-inverting op-amp, I would get a potential difference of 5V between E+ and E-, with E- equal to -2,5V.
http://www.student.itn.liu.se/~peter619/Schema_2505.doc
Could a solution be to feed the system with +/-7V instead of +/-5V as I now do? As it works then, but I do not want to use any thing else than +/-5V..
Any ideas? Thankful for any expert advice to a novice
I am having a bit of a problem getting a circuit working, need to get up to 5V totally between E+ and E- in the following circuit with a Vref of +2,5V. I use rail-to-rail op´s, feeding +/-5V but no success getting any more than 4,6V.
I thought that if I had a reference of say, 2,5V, in on the top op-amp non-inverting op-amp, I would get a potential difference of 5V between E+ and E-, with E- equal to -2,5V.
http://www.student.itn.liu.se/~peter619/Schema_2505.doc
Could a solution be to feed the system with +/-7V instead of +/-5V as I now do? As it works then, but I do not want to use any thing else than +/-5V..
Any ideas? Thankful for any expert advice to a novice