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Thread: DIY 4x5" scanner back

  1. #21
    Electron and ion microscopist
    Join Date
    May 2011
    Location
    Lund, Sweden
    Posts
    52

    Re: DIY 4x5" scanner back

    Quote Originally Posted by Steve Smith View Post
    Use the 555 circuit already suggested but instead of an LED, connect the output (pin 3) via a 10K resistor to the base of a transistor. Connect the rest of the transistor in place of the IR receiver. Run it from the scanner power supply.
    Great idea! I have just stated to play around with 555 IC (actually 556 but at the moment I'm only using one of the 555 halves).

    I'll post as soon as I have a new scan image, but at the moment I have a lot to do at work so things a progressing slowly. I managed to remove the lens array and lighting though.

    Keep all the good ideas coming.

    Thanks!

  2. #22
    Electron and ion microscopist
    Join Date
    May 2011
    Location
    Lund, Sweden
    Posts
    52

    Re: DIY 4x5" scanner back

    Here you can see the first sample image of the IRIScan back. I hope I can improve on this.

    I just built a solder free test setup with flashing IR LED. I can adjust the frequency with the potentiometer. If I can figure out how to improve the image, it could be worth trying to get a more permanent setup with a transistor instead of IR LED, and using the batteries in the scanner.

    I need to try different combinations of IR LED frequency and camera turning speed. Also try with "high" or "low" resolution with color mode or black and white mode.

  3. #23

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