Micro ampere meter circuit using uA 741


The micro ampere meter shown here is basically a DC millivolt meter.The circuit gives full scale deflection for 0.1V input.The current to be measured is passed through a known resistance R and the voltage drop across it is measured.Here the IC 1 uA 741 op-amp is wired as a non inverting amplifier.

Circuit diagram with Parts list.

Micro ampere meter using ua 741JPG


  • Assemble the circuit on a good quality PCB or common board.
  • Use a +9V/-9V dual power supply for powering the circuit.
  • The IC 1 ,uA 741 must be mounted on an IC base.
  • The table given below shows the relationship between different values of R and the current that will give full scale deflection.

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