Project: Experiment in small signal circuit design.

Discussion in 'The Projects Forum' started by hobbyist, Jul 12, 2009.

  1. hobbyist

    Thread Starter Distinguished Member

    Aug 10, 2008
    Here is a experimental circuit to sense current flowing through a wire by putting a electric cord near the top of a miniature power transformer that acts like a sensor and then turning on the appliance and that small signal gets amplified to the point where it can be rectified and then amplified in DC to turn on a LED, at the output.

    No connections to the AC cord just magnetic flux cutting through the transformer windings and amplifying the signal to a usable output voltage..

    This was fun to design...

    current sensor 5.jpg
    Last edited by a moderator: Dec 27, 2011
  2. millwood


    would it have been simpler with an opamp?
  3. Wendy


    Mar 24, 2008
    Probably, but sometimes the fun is using a specific design approach, sorta like audiophiles building amps with tube circuits.