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AC/DC supply vs. UL
Posted by Jerry Anderson on 9/26/2007, 8:41 pm
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Re: AC/DC supply vs. UL
Posted by Bert Hickman on 10/21/2007, 6:55 pm, in reply to "AC/DC supply vs. UL" Hi Jerry, With this simple circuit you won't have to worry about RFI or emissions filtering since nothing in your system will be creating any high frequency nastiness. However, since the LED's are directly connected to the incoming mains, there will be some safety consideratinos that need to be addressed. These would include the possibility of a person accidentally making contact with the mains, or fire hazard under abnormal operation/conditions. You can avoid some of these concerns by powering the LED's from a Class 2 current limited low voltage transformer and DC power supply - a "wall wart" - instead of directly off the line. Adding an electrolytic capacitor to filter the DC will reduce LED flickering a bit, but otherwise may not be necessary. If you intend to offer this as a commercial product, you may wish to contact an expert in UL/CSA requirements/verification. Good luck, Bert
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Re: AC/DC supply vs. UL
Posted by Jerry Anderson on 10/22/2007, 8:27 am, in reply to "Re: AC/DC supply vs. UL" --Previous Message-- By the way anything new going on at your end? Thanks again!
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Re: AC/DC supply vs. UL
Posted by Bert Hickman on 10/23/2007, 8:41 pm, in reply to "Re: AC/DC supply vs. UL" Hi Jerry, I was referring to the input mains (and any other portion of the circuitry that has hazardous voltages), and the need to insure that there's no possibility of accidental contact under normal conditions. There may also be flammability and fault protection considerations that may apply. The main fun thing going on here is that we're planning another production run to make Lichtenberg Figures in the middle of November. There's lots of planning and material preparation work going on, but actually making them is really quite a lot of fun (and a fair amount of work). We're really looking forward to it! Best wishes, Bert
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