Center Dash LED conversion
02-15-2007
#61
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Oh im using these values to find resistance:
Supply=14V
Voltage Drop=2.2V
Current=20mA
w/ 3 LEDS
and im getting a resistance of 260 Ohms
are these values good?
Supply=14V
Voltage Drop=2.2V
Current=20mA
w/ 3 LEDS
and im getting a resistance of 260 Ohms
are these values good?
02-15-2007
#62
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well, the car normally puts out 14.4v typical, but there are also times when warming up (esp in cold weather) where it reaches 15.5v so i always do mine around 15-16 to be safe. 14 is way too risky. its better to sacrifice a lil brightness to make them last longer.
02-15-2007
#63
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Rep Power: 223 ok so ill use 15.5V. i live in central cali and it doesnt get below 30 so it shouldnt be that much of a problem. should i go ahead and use 20mA in the calculations or use 15mA for the 3mm LEDs?
02-15-2007
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Rep Power: 223 it never gave anything, but a constant max of 30mA and a max of 75mA. i went by radio shack and their 3mm LEDs are rated at 15mA so i think i will use that value. i know the resistor has to be soldered to the anode (positive) side of the LED, but does it matter what end of the resistor is soldered to the LED? i dont think it does but just checking
03-01-2007
#67
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Rep Power: 0 ok, so i got my LED's and resistrs last week - but i was too busy to do anything. Tonight after work I got started and if my way works (kinda of a play off gearbox's version) I'll write a DIY for it.
only issue right now is i dont know the resistance of the resistors that they sent because they didnt label them like they did with the LED's
Blue 7000mcd 5mm
Wavelength:460-470
MCD:5000-7000
Vf(V): 3-3.4
Degree:20
is whats labeled on the bag for the LED's
oh, and gearbox - how many resistors/and what resistance, resistors did you finally end up using?
I know the color bars on the resistors help identify the #, but i cant find anything to help determine the resistance - here are the color if anyone happens to know:yellow,orange, looks like black, dark green, and dark brown?
only issue right now is i dont know the resistance of the resistors that they sent because they didnt label them like they did with the LED's
Blue 7000mcd 5mm
Wavelength:460-470
MCD:5000-7000
Vf(V): 3-3.4
Degree:20
is whats labeled on the bag for the LED's
oh, and gearbox - how many resistors/and what resistance, resistors did you finally end up using?
I know the color bars on the resistors help identify the #, but i cant find anything to help determine the resistance - here are the color if anyone happens to know:yellow,orange, looks like black, dark green, and dark brown?
03-01-2007
#68
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