current v voltage

Discussion in 'General Electronics Chat' started by monty_a2, Sep 17, 2010.

  1. monty_a2

    Thread Starter New Member

    Aug 11, 2010
    I have an electronic indicator that has a 4-20ma input.
    However my circuit is a 0-10vdc supply. Not sure why it won't work.
  2. Jaguarjoe

    Active Member

    Apr 7, 2010
    I'm not sure why it would work. One's a voltage, one's a current, like apples and oranges.

    The simplist voltage to current converter is a resistor. Put a 500 ohm resistor in series with your source and your indicator. Now 2-10 volts will provide 4-20 ma. If you can't live with 2-10 and must have 0-10, you'll need to buy or build an op-amp converter.

    Google "voltage to current converter" and you'll get 341,000 hits. One of them will suit your fancy.

    Volume 3 of the e-books on this site also has info on converters.
  3. Wendy


    Mar 24, 2008
    The first place to start is a schematic, it is the language of electronics. You can describe a circuit all day and still not communicate a circuit better than one schematic will do.