-klb- Posted March 11, 2009 Share Posted March 11, 2009 Some further notes on this..These particular strings have molded resistor packs in line. On the one running half wave, it was not particularly warm to the touch.. The one running full wave got quite warm to the touch...One idea for ensuring that you don't accidentally plug the wrong side into the rectifier would be to build these as single inlet controllers, and build the rectifier into the connectors that power the second inlet from the right side inlet... Link to comment Share on other sites More sharing options...
Dr. Jones Posted March 11, 2009 Author Share Posted March 11, 2009 the lights I will be using have no inline resistors Link to comment Share on other sites More sharing options...
-klb- Posted March 11, 2009 Share Posted March 11, 2009 Commercial strings, modified, or home brew? Link to comment Share on other sites More sharing options...
Dr. Jones Posted March 12, 2009 Author Share Posted March 12, 2009 commercial - el cheapo brand Link to comment Share on other sites More sharing options...
-klb- Posted March 12, 2009 Share Posted March 12, 2009 They may not be obvious, but I really expect there to be a resistor in there somewhere.. Though in different lengths, there may be much less energy to dissipate from the resistor than in these 30 LED strings..The reason there really should be a resistor in there is that current through a string of LEDs varies exponentially with voltage, not quasi linearly as with a light bulb... Link to comment Share on other sites More sharing options...
Dr. Jones Posted March 12, 2009 Author Share Posted March 12, 2009 they are 100ct strandsI have torn one apart and did not find any resistor. I would expect to find a resistor on a multi color strand, as the voltages vary from color to color Link to comment Share on other sites More sharing options...
Max-Paul Posted March 13, 2009 Share Posted March 13, 2009 Multi colored stran,are these different colors on the same circuit? Or are there different circuits, one for each of the colors?As I know it from working with a conversion from filimented strings to LED strings. Red, Yellow, and orange are about 2.1 volts. And Blue, Green, and any White LED are about 3 volts.MaxBTW I agree, I would be almost certain that there has to be a current limiting resistor in there somewhere. You have cut open the plug(s) on the ends? Link to comment Share on other sites More sharing options...
Dennis Cherry Posted March 13, 2009 Share Posted March 13, 2009 What colors of LED's are in the Multi string, might calculate out to a 50 light string.Not all LED strings have resistors or diodes. I have several colored strings (35 light HW) that way, including White, Blue, and Green. The Red's had 75 LED's in one string but the intensity and operating current was too low. Removed 5 LED's from each string and the intensity and current came up from 8-9 ma to 15-20 ma, which matches the other colors current draw and intensity.Before anyone asks, no I did not have one failure of the 50 plus strings used in 2008.Max-Paul wrote: Multi colored stran,are these different colors on the same circuit? Or are there different circuits, one for each of the colors?As I know it from working with a conversion from filimented strings to LED strings. Red, Yellow, and orange are about 2.1 volts. And Blue, Green, and any White LED are about 3 volts.MaxBTW I agree, I would be almost certain that there has to be a current limiting resistor in there somewhere. You have cut open the plug(s) on the ends? Link to comment Share on other sites More sharing options...
terrypowerz Posted March 14, 2009 Share Posted March 14, 2009 -klb- wrote: Some further notes on this..These particular strings have molded resistor packs in line. On the one running half wave, it was not particularly warm to the touch.. The one running full wave got quite warm to the touch...Beavis voice:FIRE....! FIRE... !Yesssssssss! Link to comment Share on other sites More sharing options...
Rafter Bar R Posted March 14, 2009 Share Posted March 14, 2009 You know what his would be good for, LED rope lights, one could bias the board to be either common positive or common negative. With a little modding, the board could be set up to supply rectified DC on all channels. This could be done severing the traces to the tranformer and then supplying AC to it while isolating it from the channel outputs.I have a circuit that uses full wave rectification and uses SCR's to switch individual circuits running DC 120 to LED strings and it does work. Link to comment Share on other sites More sharing options...
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