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I often get questions about changing a bipolar supply circuit (using positive and negative supplies) to a circuit that uses no negative supply. Operational amplifiers do not care whether or not they have a negative supply, but do require a certain range of total supply voltages. So, for +15V / -15V performance, it would seem that we may need a positive supply voltage of +30V and ground. However, the input should be near halfway between the two supply voltages, or in the vicinity of +15V with a s ...