Project: Experiment in small signal circuit design.

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

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  1. Jul 12, 2009 #1
    hobbyist

    Thread Starter Distinguished Member

    Aug 10, 2008
    884
    85
    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
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  2. Jul 13, 2009 #2
    millwood

    Guest

    would it have been simpler with an opamp?
     
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  3. Jul 13, 2009 #3
    Wendy

    Moderator

    Mar 24, 2008
    21,286
    2,906
    Probably, but sometimes the fun is using a specific design approach, sorta like audiophiles building amps with tube circuits.
     
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