Heating coil

Discussion in 'The Projects Forum' started by stanman11, Mar 16, 2011.

  1. stanman11

    Thread Starter Member

    Nov 23, 2010
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  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Schematic/image is too small. Please resize.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,103
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    There's little chance this will work, since even I can find at least two critical errors:
    1) The input to the the non-inverting pin 3 is just a 200k resistor. The impedance of the input is very high, so pin 3 will be at 9v and the op-amp will be full on all the time.

    2) The op-amp cannot source more than 30mA. You haven't specified your heating coil but 30mA isn't much current. It would have to be tiny to work.
     
  4. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    Why start a new thread on your weed vaporizer?
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,103
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    Maybe because the first thread veered off (into the weeds?) into guitar amp circuits?

    OP, you appear to be trying to build something yourself that is widely commercially available with nice features such as safe operation and controlled, variable temperature - everything you could want. I understand trying to DIY, but the project is probably beyond your skill set and will likely cost you more in the long run than just buying something off shelf. If you're starting a new hobby, fine, but don't expect to save money on completing your first project.
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,765
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    A word about images. I used M/S Paint with excellent results. I either attach the drawing to the post or post it in AAC local albums (yep, and they are free). Local attachments can be used to display an image as part of the post, as can any album picture.

    How to Display Attachments Full Size


    I also have a set of templates of various electronic components you can download from here for free. I named it PaintCAD.

    Introduction and PaintCAD

    Here is a sample of my latest drawing for another thread. You be the judge whether it is worth your time to learn. Took less than 30 minutes to draw...

    [​IMG]

    By the way, avoid .jpg. It always comes out fuzzy. The superior formats are .gif (B&W and schematics) and .png (photos). The above picture is a .gif.
     
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