LED circuit?
I recently purchased a few LEDs for a project, 2 blues and four reds. I need a way to power them all for months at a time. Would a nice soul be kind enough to draw up a schematic for me, considering I know NOTHING about this stuff? Here are the schematics, taken right off the back of the packets.
4 Red LEDs:
Forward Current: 28mA max
Forward Voltage 2.6 V max
2 Blue LEDs
Forward (supply) Voltage: 3.7 typical, 4.5 Max
Forward (supply) current: 20mA typical, 30mA max
Any help?
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Jun 25, 2009. 10:08 AMdeath defyer
says:
there u go make sure the power supply is from a wall adapter of 12 volts or else a battery couldnt power it and if 100 ohm resistors dont work try 10k ohm
led.Sch7 KB
Thanks for the info, however that file is a .tmp file and I am unable to open it. Would it be possible to convert that to an image? Thank you.
Sep 20, 2010. 9:40 AMkadris3
says:
red leds typically have 2.1 vdc at 20 ma. this is what you use if you want them to last. the screaming led specs you give a max(never exceed under any circumstances). they may last for a while using these figures. a 12vdc supply, that's exactly 12v will light 5 red led's in series with a 180 ohm resistor. if it is regulated 12v and never exceeds 12v then 100 ohms can be used.
for the white leds use 3.4 vdc and 20ma. 3 white leds in series with 180 ohms
works well. by the same token, a regulated supply can use 100 ohms for current limiting.
good luck with your project. unclecytheledguy.
for the white leds use 3.4 vdc and 20ma. 3 white leds in series with 180 ohms
works well. by the same token, a regulated supply can use 100 ohms for current limiting.
good luck with your project. unclecytheledguy.
http://led.linear1.org/category/led-basics/ will help you a lot have a look round the site and read up on LEDs
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