Question about measuring current in a circuit?

Discussion in 'General Electronics Chat' started by Göktuğ HAMBARCI, Sep 12, 2017.

  1. Göktuğ HAMBARCI

    Thread Starter New Member

    Mar 27, 2017

    There is something I want to ask about the circuit that I share.The circuit is used to control a motor(draws about 30 amps.)
    my question is this circuit how to measure current , what I understand is that the current is measured by raising the voltage on the resistor with the op-amp. but Why power line like this , Is there a shunt res which one is it?
    I can not explain exactly, but if you understand something from these pictures, please help.
    InkedInkedWhatsApp Image 2017-09-11 at 11.14.00_LI.jpg InkedWhatsApp Image 2017-09-11 at 11.14.00 (1)_LI.jpg WhatsApp Image 2017-09-11 at 11.21.54.jpeg
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
    It looks like they are using a length of PCB track as a resistor to sense the current.