Haha thanks. But next time I'm using PCB dy. Aih...Much neat now...nice....I'm very fond of neat DIY job..It makes those half pass six acc shop guys look like newbie when they see our work...
WALAO EH. Now all the sifu only come out. -.-ohms law. Better use the lm7805 linear regulator. just like the lm7809 suggested in smarttag thread.
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Bro, lm7805 is 5v, how you connect? 2 x leds in serie or 1 x led + resistor per set?ohms law. Better use the lm7805 linear regulator. just like the lm7809 suggested in smarttag thread.
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Share the whole process please! Make a new thread!i just found out about them in the smartag thread.. i bought them and tried.. they really work! much better than using resistors because can stick a heatsink on them...
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bro, i am asking the smarttag one.use a lm7809 to produce 9v n connect 3 x 3v leds in series per bank.
led voltage = 3v so 3 x 3led = 9v so no resistor required.
say 12 leds required for your brake light.
you need 4 banks. each bank draws ~25ma current = 100ma.
lm7809 is 1,000ma ~1,500ma loading. or can easily connect up to 40 banks or 120 leds
input voltage = 11v ~ 35v, power consumption = 2watts (14v x 100ma + some powerloss)
advantage of this DIY.
Cheap (RM3) only.
same led brightness when car is started (14v) or not (12v).
option 2. simpless DIY.
connect 5 leds in series per bank. 5 x 3v led= 15v no resistor required.
brightness is lower.
http://static.rcgroups.net/forums/attachments/7/5/7/6/5/a775496-132-9v-regulator.gif?d=1143243404bro, i am asking the smarttag one.
Did not know you sifu in this....use a lm7809 to produce 9v n connect 3 x 3v leds in series per bank.
led voltage = 3v so 3 x 3led = 9v so no resistor required.
say 12 leds required for your brake light.
you need 4 banks. each bank draws ~25ma current = 100ma.
lm7809 is 1,000ma ~1,500ma loading. or can easily connect up to 40 banks or 120 leds
input voltage = 11v ~ 35v, power consumption = 2watts (14v x 100ma + some powerloss)
advantage of this DIY.
Cheap (RM3) only.
same led brightness when car is started (14v) or not (12v).
option 2. simpless DIY.
connect 5 leds in series per bank. 5 x 3v led= 15v no resistor required.
brightness is lower.
Bro, me only major in Electronic n Computer..Did not know you sifu in this....
Bro, eBay. It is cheap. So far so good.Bro, me only major in Electronic n Computer..
Btw, where 2 source for good super bright led? tried pasar rd - not ideal.
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.