Current Transducer + Output Indicator

Discussion in 'The Projects Forum' started by koszowo, Nov 2, 2010.

  1. koszowo

    Thread Starter New Member

    Nov 2, 2010
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    Hi All
    I have a LEM current transducer with 0-10V output
    http://www.lem.com/docs/products/at_b10_e.pdf

    I want to have a LED or lamp or anything that will indicate that there is any voltage on the output of the current transducer.
    eg. 0 V - indicator off
    1V up to 10V - indicator on

    Is there any LED or lamp that will work on 0-10 V ?

    Thank for help
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    782
    The device appears to be a voltage only (limited current) output type.

    It may not be capable of delivering sufficient current to directly drive an LED.

    You would (for instance) be able to buffer the transducer output with a high impedance op-amp circuit which could subsequently drive an LED. But that would require an auxiliary DC supply to power the buffer circuit.
     
  3. koszowo

    Thread Starter New Member

    Nov 2, 2010
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    Do you know if there is any device that could do it?
    Could you give more details how to do it?

    Thank you
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Perhaps it would help if you gave a more detailed listing of your requirements including

    1. Required primary current range.
    2. Do you only want to detect the presence of primary current or do you also want to measure the actual primary current value?
    3. Whether or not you are limited to using a self-powered transducer.
    4. Would you consider using a secondary side powered transducer?
    5. Whether you have sufficient skill to build any additional interface electronics.
    6. Are you on a very limited budget?
     
    Last edited: Nov 2, 2010
  5. koszowo

    Thread Starter New Member

    Nov 2, 2010
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    0
    Thanks for answer. Please find my answers below.

    Required primary current range.
    Primary current range 0-5 A

    Do you only want to detect the presence of primary current or do you also
    want to measure the actual primary current value?
    I want only to detect the presence of primary current.

    Whether or not you are limited to using a self-powered transducer.
    Self-powered transducers are preferable.

    Would you consider using a secondary side powered transducer?
    It could be an option.

    Whether you have sufficient skill to build any additional interface electronics.
    Skills are probably not sifficient but I want to try.

    Are you on a very limited budget?
    not very limited but limited.

    I hope this helps
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,094
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    I wonder if you couldn't just light an LED directly with a device mounted right NEXT to the transducer? At that current range, I think a few loops of wire - an in situ transformer - might give enough juice to power an LED, which could probably be protected against over-current with a zener or other current limiting trick. Downside is the need to loop around the main conductor.
     
  7. koszowo

    Thread Starter New Member

    Nov 2, 2010
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