Recent content by JSTFLK

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  1. J

    Can anyone identify this connector?

    Looks like a flat flex connector. Digikey, Newark, Alibaba and EBay have them in all varieties. Digikey and Newark have a VAST selection, but cost a bit more with the added bonus of sourcing from very reputable suppliers. You'll want to know the size, connector pitch connector count though...
  2. J

    UV led makes you see things

    I'd suspect that you might be seeing speckle from highly coherent light, or you might be suffering from retinal fatigue from saturation. Maybe both. High intensity light is bad for your vision. High intensity, short wavelength (<blue) light is really bad...
  3. J

    LEDs and humming sound in 2015

    A lot of current drivers (especially cheap or high efficiency units) will limit themselves to a range of PWM that reduces losses. So for instance, suppose at 0.95 duty cycle, the driver is 90% efficient, at the desired load is .60 duty cycle, the driver will run in bursts of 0.90 duty cycle...
  4. J

    Constant current/voltage + PWM controlling

    PWM+ a nice big LC filter will help quite a bit. In fact, that's what a constant current driver is! "naked" PWM will saturate the LED . Once you hit the maximum current, the extra power increasingly becomes heat and not light. A sufficiently designed LP filter will actually increase the...
  5. J

    12 volt DC 30 watt led chip

    I have about 15 of those 30W chips. As others have said, they require 30-34V and about an amp of current. Hooking up 12V won't push the chip past it's knee voltage, and no significant amount of current will flow. Unfortunately, they need LOTS of thermal dissipation (picture a heatskink on a...
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