- Apr 18, 2006
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rs online or element14.com
both got branch in malaysia if you want luxeon leds and drivers
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---------- Post added at 01:19 AM ---------- 6 hour anti-bump limit - Previous post was at 01:14 AM ----------
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oh, nvm, i get your point, but easily solvable by not running the leds in series right?, so LM7805/LM7809 + resistors + leds in parallel is workable?
btw stpcar, I used the lm7809 + caps for the smarttag, not LEDs.
both got branch in malaysia if you want luxeon leds and drivers
Sent from my GT-I9100G using Tapatalk 2
---------- Post added at 01:19 AM ---------- 6 hour anti-bump limit - Previous post was at 01:14 AM ----------
isn't the lm7809 current limited to 1A? Why would it be a problem?It is not a good idea to drive the LED using this method. A proper way should be controlling the current but not the voltage. Reason why is because LED has a very steep V-I curve. A slight changes in voltages will cause a huge changes in current. If the LED has a low side in forward voltage due to manufacturing batch, then it may end up blowing these LED in a short period of time.
Sent from my GT-I9100G using Tapatalk 2
oh, nvm, i get your point, but easily solvable by not running the leds in series right?, so LM7805/LM7809 + resistors + leds in parallel is workable?
btw stpcar, I used the lm7809 + caps for the smarttag, not LEDs.
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