Simple Micro Ampere Meter Circuit

This is a design of simple micro ampere meter. This circuit is basically a DC milli volt meter. This is a figure of the circuit.


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. This circuit is based on the IC 1 uA 741 op amplifiers wired as a non inverting amplifier. Use a +9V/-9V dual power supply for powering the circuit. The table given below shows the relationship between different values of R and the current that will give full scale deflection. The IC 1, uA 741 must be mounted on an IC base.