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Simple current question.

Discussion in 'Project Construction Technologies' started by Richard9025, Mar 17, 2019.

  1. Richard9025

    Richard9025

    205
    7
    May 24, 2016
    Hi!

    I'm building an ESR meter, a classic one with an analog microammeter for indication.

    The problem is, the circuit is designed for a 50 uA microammeter. I only have a 200uA meter.

    I get 1/4 full scale reading for 0ohms, shorted terminals (that's good because at 0 ohms means 50uA that is 1/4 of my meter's scale)

    If I remove the "zero adjust" potentiometer and a series resistance, I can get a maximum of 110uA out of the circuit, but that is 1/2 of my meter's scale....

    For full scale I need 200uA.

    How can I increase the current to reach a full scale reading? By using some kind of DC current amplifier? Or maybe a voltage doubler?

    I'll upload photos later, the question is simple: How can I adapt a higher amperage ammeter to work in a lower amperage circuit?
     
  2. Bluejets

    Bluejets

    3,375
    678
    Oct 5, 2014
    davenn likes this.
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,158
    2,676
    Jan 21, 2010
    Post the schematic. All that might be needed is a change in the value of another resistor.
     
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