markdem
Member level 3
Hi all, I am tiring to design a circuit to amplify the output form a PH probe so I can then read it using a ADC. I am using a TL081 with +/-5 supply. I have set the gain to 10 with a 9k1 and 1k resister, and that part works ok. I also need to offset the output so I only get positive results. I have tied to put a 10k pot on pin 1 and -5v rain with the wipe going to pin 5, but that is not doing anything, eg the output will not offset when I short the inputs. Can someone please help me offset the output?
Thanks, Mark
Thanks, Mark