Running Op Amps on a Single Cell (.PDF Download)

A single diode drop is 0.6 V. So, you can see that making an op amp that works of off 0.9 V might be pretty difficult. Worse yet, at cold temperatures, that single diode drop can get up to 1.2 V. There are parts that do work at 1.2 V, the voltage of a mildly discharged alkaline battery cell.

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