Connect with us

Simple current question.

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

Scroll to continue with content
  1. Richard9025


    May 24, 2016

    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


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

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Post the schematic. All that might be needed is a change in the value of another resistor.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
There are no similar threads yet.
Electronics Point Logo
Continue to site
Quote of the day