Using a 741 operational amplifier, this circuit amplifies very low voltages, allowing its measurement in a common multimeter or millimeter of 0 to 1 mA. The range obtained is from 0 to 10 mV and the power supply must be symmetrical, formed by two 9 V batteries. In fact, the circuit will work with symmetrical sources from 6 to 12 V. Other operational can be used and the input resistance is high.
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