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 Mod Parallel port to 8 Row of LED, Guide to make this project

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andythung
post Nov 1 2009, 02:47 AM

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BRo ... i try b4 put tis kind of led .... i juz straight put + and - into the fan wires there .. it work ... but few hr ltr ... all no light d ... all bakar d = = wahaha~
andythung
post Nov 7 2009, 02:30 AM

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QUOTE(cebi @ Nov 2 2009, 03:20 PM)
into fan wires? shocking.gif . LED cannot tahan la if u connect at 5V,but put resistor should be okay  icon_rolleyes.gif .

P/S - I thought u connected to parallel port,huhu  tongue.gif


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ofcos i got put resistor ~~ but hor still burn d ~~ haiz ~ maybe resistor not enough ~~ cos i dun calculate ~haha blush.gif
andythung
post Nov 7 2009, 12:26 PM

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QUOTE(cebi @ Nov 7 2009, 11:13 AM)
hehe,usually i put 1k ohm to 12V and so for so good  icon_rolleyes.gif
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which mean current only 0.012A ?? actual current runing in LED is how much d ? ?
andythung
post Nov 8 2009, 11:06 AM

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QUOTE(mengsuan @ Nov 7 2009, 01:17 PM)
Typical LED forward bias current varies from 5mA to 20mA.

For this low power application, why not use a common resistor to ground instead of 8 resistors?
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huh ?? resistor to ground ? mind to explain ?? = =
andythung
post Nov 9 2009, 02:33 AM

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QUOTE(safone @ Nov 8 2009, 09:51 PM)
thumbup.gif  thumbup.gif Good job TS..
But sadly i can't do this.. cry.gif ..coz no parallel port at all 3 of my RIG.. doh.gif
TS..can do it using serial port or other connection like usb port?.. hmm.gif
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of cause can . haha ~~ but i duno lox !~~ maybe quite hard lox ~ rclxub.gif
andythung
post Nov 15 2009, 12:19 AM

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lol.... old rig need dirty only nice ma ... new rig wan dirty also hard le ~~
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