Guest Yevgenip Posted December 5, 2004 Report Share Posted December 5, 2004 Hi.I want to make my computer look like it is floating by putting some Ultrabright LEDs under it (Like in those fancy cars).I figured I'll use the transformer fan output which is 12 V as a power supply, pass it through a voltage devider and then connect the LEDs in parallel.The LEDs work on 3.5 Volts and 20 mA.Two Questions:1) Will my design work? have a better design?2) What is the maximum ouput power my fan output can produce? /or/ What do I do if I don't want to burn my PSU?Thanks. Quote Link to comment Share on other sites More sharing options...
ante Posted December 5, 2004 Report Share Posted December 5, 2004 Hi Yevgeni,You need series resistors for the LED:s and you can feed them from the PC PSU on the 5V or on the 12V output. These outputs can provide power enough for hundreds of LED:s. It won Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 6, 2004 Report Share Posted December 6, 2004 Thanks, Ante. 8)I know how to calculate the resistance I need to get the needed current and voltage drop. Do you mean to connect a resistor to each LED or a really big one before the parallel junction? Did you mean a different calculation?Thanks. Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 6, 2004 Report Share Posted December 6, 2004 Oh and another thing:What kind of fuse would you recommend? How do I calculate the amps of the fuse? where to put it (On the circuit that is)?Sorry for all the basic question, I realy don't want to screw it up and plus: You are an electronics theory expert god 8), and I'm just hopping to a Jr. theorist. :'( ;D Quote Link to comment Share on other sites More sharing options...
surajbarkale Posted December 6, 2004 Report Share Posted December 6, 2004 As you have voltage accross LED's 3.5V you can connect 3 of them in series & then parallel sections of three series LED's. This will reduce the value & power loss in the series resistor. :) Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 6, 2004 Report Share Posted December 6, 2004 Good idea, thanks. ;D Quote Link to comment Share on other sites More sharing options...
ante Posted December 6, 2004 Report Share Posted December 6, 2004 Yevgeni,While you are calculating the series resistors you also know the currents so just sum them up and add some headroom and you have the value of a suitable fuse. Put it in the positive feed line close to the source. Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 7, 2004 Report Share Posted December 7, 2004 Thanks Ante, useful info.P.S.I can't see your personal picture. ??? Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 7, 2004 Report Share Posted December 7, 2004 Oops, Sorry. ;DI can see it now.Here is something nice for you: www.myquickmail.com Quote Link to comment Share on other sites More sharing options...
ante Posted December 7, 2004 Report Share Posted December 7, 2004 I wouldn Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 8, 2004 Report Share Posted December 8, 2004 Why not, have you tryed it? Quote Link to comment Share on other sites More sharing options...
ante Posted December 8, 2004 Report Share Posted December 8, 2004 Yes, and I was re-routed to some other site with lots of trouble. The Quote Link to comment Share on other sites More sharing options...
Guest Yevgenip Posted December 8, 2004 Report Share Posted December 8, 2004 Wow, thanks for the warning. I wasn't redirected anywhere, but I think I'll stop using it. Even though someone told me he is currently using it. ??? Quote Link to comment Share on other sites More sharing options...
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