I have been stuck with a problem in my pHmeter expt for almost a month. I searched the net and found many pH circuits and tried many but none are working.I have attached my circuit diagram with this.The problems i face are-1)There is lot of 'noise' present in the output of the TL081. Even if I touch the BNC of the electrode noise can be seen in CRO, 2)the voltage values don't seem to be constant.it keeps on changing with time.if for acid to base i get 800mV change,at the next instant i get 400mV change. What can i possibly do to make my project working??
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