controlling a hotwire


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  1. #1
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    Thanks Dave, Can't seem to get the app note to load, but very good info!!

    If you can edit, I can too thanks for the melabs link. Maybe I should go and read through the stuff there sometime. This seems exactly what I need!
    Last edited by cncmachineguy; - 27th January 2011 at 03:00.
    -Bert

    The glass is not half full or half empty, Its twice as big as needed for the job!

    http://foamcasualty.com/ - Warbird R/C scratch building with foam!

  2. #2
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    This one?
    http://ww1.microchip.com/downloads/e...tes/40171a.pdf
    Loads here, I could email it to you...
    Dave
    Always wear safety glasses while programming.

  3. #3
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    Must have need you to get it jumpstarted. Any ideas for the TRIAC? looking for the one listed in the app note now, no joy at digikey. No part number on Mister_e (tm) circuit.
    -Bert

    The glass is not half full or half empty, Its twice as big as needed for the job!

    http://foamcasualty.com/ - Warbird R/C scratch building with foam!

  4. #4
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    Quote Originally Posted by cncmachineguy View Post
    Any ideas for the TRIAC?
    A big one

    http://www.mouser.com/Search/Refine....rd=logic+triac
    Maybe the BTA12 ?
    Dave
    Always wear safety glasses while programming.

  5. #5
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    Or a BT137??
    -Bert

    The glass is not half full or half empty, Its twice as big as needed for the job!

    http://foamcasualty.com/ - Warbird R/C scratch building with foam!

  6. #6
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    Hi, Bert

    I recall a SCR switching circuit to control the avarage voltage across a motor for a simple speed control.
    Halas it uses the Counter EMF of the motor ...

    The trick here is to use PWM and sample the wire resistance ( needs wire with a PTC ! ) while PWM is off ...

    Alain
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  7. #7
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    needs wire with a PTC
    What is PTC?
    Dave
    Always wear safety glasses while programming.

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