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Old 05-08-2004, 05:11 PM   #61
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My thinking is he wanted to keep the pos and neg as far away from each other as possible. Or he could have a thing for yellow
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Old 05-09-2004, 06:21 AM   #62
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I used something like pvc pipe, but its nylon fencing post.
here's some photo's of the finished project
http://bellsouthpwp.net/b/c/bckane/moonlights/
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Old 05-09-2004, 11:03 AM   #63
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I recently put together a set of moonlights using a 9v dc power supply and 3 LEDs from lsdiodes.com. Also, I used the calculator from http://metku.net/index.html?sect=vie...calc/index_eng this site which said I should use one single 91 ohm resistor. The lights all look great and each has 3.3v across. However, the resistor gets very hot after just a few seconds. Is this normal? Will it cause problems if it is plugged in for any length of time? Here is a wiring diagram. If I were to use 3 separate resistors, what size should they be if I wanted 3.5v across at 20 ma?
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Old 05-09-2004, 11:17 AM   #64
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Your probelm is the resistor, it's probally a 1/4 watt or 1/2 watt, you need a 1 watt or higher to do it like that. If you go to 3 resistors then the 1/4 watt or 1/2 watt will be fine. HTH
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Old 05-09-2004, 11:26 AM   #65
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Yes, the resistors are 1/4 watt. What ohm would I use if I used 3 resistors? Whatever ohm the calculator tells me for a single LED?
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Old 05-09-2004, 11:44 AM   #66
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9vdc drop down to 3.5 vdc 9- 3.5 = 5.5 5.5 divided by the current draw of your led will give you the resistor needed. If it 20 ma the 5.5 divided by .02 is 275 ohm. If the current rating of the led is 30 ma then a 183 ohm resistor will work.
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Old 05-09-2004, 03:48 PM   #67
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gerald that's not fair! how do you get all the easy questions!?
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Old 05-09-2004, 03:52 PM   #68
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how do you get all the easy questions!?
you call that easy? lol I had to dig the book out to figure that out.
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Old 05-09-2004, 03:55 PM   #69
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you suck i know all that garbage off the top of my head..
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Old 05-09-2004, 05:04 PM   #70
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you suck i know all that garbage off the top of my head..
I'm just not that smart. To much time in the Air Force when I was younger.
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