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  1. jasonh

    Ultraviolet LED supplier suggestions?

    All very interesting and en-lightening (pardon the pun) views today. nbucska and IRstuff obviousely know much more than I do about lasers and UV LEDs. Thank you for the info. Just FYI, I am using UV LEDs to illuminate "invisible ink" that was purchased from Sirchie police supplies...
  2. jasonh

    Ultraviolet LED supplier suggestions?

    I believe that the LED in a laser pointer is pretty much just a standard LED, and that the prism attached is what makes it into a laser. There may be a way to filter the light coming from a red LED, to obtain only the UV component, but I expect the resulting UV component would be very low in...
  3. jasonh

    op-amp filters

    It really depends upon your application/needs - Maybe more importantly, what is your load? Obviousely, passive may be easier to construct if you can get by with a low-order passive filter. But active filters offer high input impedance and low output impedance, gain, and a wide variety of...
  4. jasonh

    Ultraviolet LED supplier suggestions?

    Thank you for the reposonses so far. Ledmuseum has some very interesting testing info, which identifies the manufacturers name of the LEDs tested. Thus far I have identified the following as UV LED manufacturers: *Roithner-laser (noted at LEDmuseum) 350nm, 380nm, 394nm *LEDTronics (noted at...
  5. jasonh

    Ultraviolet LED supplier suggestions?

    I'm looking for recommendations for ultraviolet LED supplier sources for ~370nm, 1-5mw@15-20mA, with two variations; one with ~110 degree view angle, another with ~30 degree view angle. I would appreciate any recommendations, but I prefer a US company or at least one having a US location.
  6. jasonh

    PCB Manufacturers???

    Somewhat depends on your preferences. I like using board houses that are fairly local, which for me is the Carolinas area. I use http://www.americancircuits.com which is located in Charlotte NC.
  7. jasonh

    Strange resonance phenomenon?

    Hey yesway - I just have a couple more things you might consider: The plastic box may be causing a feedback problem by "coupling" the speaker to the mic, you could test this easily by strategically placing a c-clamp at various positions on the plastic box to see if there are any...

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