Micro ampere meter circuit using uA 741

admin July 30, 2008 4 Comments

Description.

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-741.JPG

Notes.

  • 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.
Comments
  • tanvi
    February 14, 2015

    what are the values of R and what is M1…..?

  • Seetharaman
    February 14, 2011

    R3 should be 3.3K, typographical error
    Hi Thusihta R values
    0 to 1mA for FS R should be 0.1 ohm (100milli ohm)
    0 to 10mA for FS R should be 0.01 ohm (10 milli ohm)
    0 to 100mA for FS R should be 0.001 ohm (1 milli ohm)
    0 to 1 Amp for FS R should be 0.0001 ohm (100 micro ohm)
    0 to 10Amp for FS R should be 0.00001 ohm (10 micro ohm)

  • thusihta
    February 14, 2011

    please give me the values of r
    like table

  • Er H.M.Rai
    February 5, 2011

    SIR
    ELECTRONIC CIRCUITS ARE USEFUL FOR TEACHING TO STUDENTS OF N.C. COLLEGE OF ENGINEERING ISRANA – 132107 PANIPAT – INDIA
    STUDENTS LOVE THESE CIRCUITS IN THEIR PROJECTS

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