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  1. Over_the_hill

    Cree spice models.

    Cree does publish some SPICE models - for the XP-G, XP-G2, XP-E, XP-E2, XM-L, XB-D and probably others. Those are the ones I've used in LTSPICE. Here's an example. Starting at the Cree.com home page, click on these: Components and Modules Document Library On the documents page, look up...
  2. Over_the_hill

    Can a homebrew FET circuit replace a NTC?

    As for not having a scope, you might be able to see the brightness increase during a short turn-on period by taking a video clip with a digital camera. Your camera might be able to make a video at (say) 640x480 or 320x240 pixels at 60 fps or 30 fps. Press the shutter, turn on the switch, capture...
  3. Over_the_hill

    Recommend me some headphones

    Yes, the Koss KSC-75s are good headphones. They are clip-ons, but otherwise the speaker elements are supposedly similar to those in the PortaPro. (I don't have a PortaPro to compare with them.) They need more power to produce the same sound level than some other little headphones, but the nice...
  4. Over_the_hill

    Would you buy a Fenix P1 with a clickie?

    Yes, I'd prefer a P1 clicky. A couple of days ago I gave my P1 to my brother. It's a nice light. But I just didn't like to fumble with it and take longer to get it turned on when I had my hands, or one of them, full. And I've kept the L2P with the 1xAA and 1xCR123 bodies, because I find...
  5. Over_the_hill

    Best Light Meter??

    Has anyone used the ColorVision Spyder2 Express light meter ($70)? It's sold as a color temperature matching and general calibration tool for CRT and LCD monitors, presumably for people doing DIY pre-press work and the like. It consists of a light meter head and some Windows/Mac software...
  6. Over_the_hill

    Best Light Meter??

    There's an interesting discussion here http://avsforum.com/avs-vb/showthread.php?t=582833 comparing the medium-priced Extech 401036 ($220) and AEMC CA-813 ($170) light meters with high-end laboratory meters. These people are using the meters to adjust movie theater projectors to get the...

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