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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...

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...

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...

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...

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.

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.

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...