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#16
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nib writes:
TOMJ: I like what you did there. I should have my order of LED's 12 V direct replacements for the 2721 bulbs in tomorrow So I can let you know- I hope if they work in the instrument stuff- ie. defroster, rear wiper, sunroof etc. I tried those with the 5mm 3.7V 20Ma 2600mcd Radio Shack LED - the view angle is supposed to be 30 deg. but as you say - really did not help much in those switches But in the window switch they look really great so I would pay the extra $$ for the blue. I have to say that the red in the BMW was never my favorite color. What size are the LED's you installed and what size are the resistors ? I will try and borrow a digi cam so I can post what I get up with. Peace
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nibiru 82 300TD- diggin it Ich habe Dinge gesehen, die ihr Menchen niemal glauben würdet Gigantische Schiffe, die brannten, draußen vor der Schulter des Orion Und ich habe C-beams gesehen, glizernd im Dunkel, nahe dem Thannhäuser-Tor All diese Momente werden verloren sein....in der Zeit so wie...Tränen im Regen |
#17
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Hi,
I'm also thinking of replacing all the lamps in the switches around the gear shaft for blue ones. Will look nice in combination with my chrome shaftboard frame. The thing about standard LED's is: - Available in 3mm and in 5 mm sizes - Forward current depends on type from 1 to 20 mA - Voltage across LED, depends on color from 1.8 to 2.2 volt The LEd's have different illumination strengths and view angles. They are also available as low current LED's and as High Brite led's. SMD (Surface Mount Device) led's are even smaller then 3 mm, but bit harder to solder the wires. To connect a LED to a 12V source a resistor is required. For 12V: 12V - 2V(appr. voltage across LED) = 10V to be dropped across resistor. For a LED current of 20mA: 10V/0.02 = ~500 Ohms. 500 Ohm is not a standard E12 value, but we can use 470 Ohm resistors. By connecting the LED's in series we can use smaller resistor values as the voltage across the LED is added up, so less has to be dissipated by the resistor. Will try to find some blue ones at Farnell/RS and test it. Didn't see any blue ones with integrated resistors though. Other colors are also available with integrated resistors within the LED. So you can't see the difference. |
#18
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Quote:
Quote:
Quote:
Resistors (should have clarified - STOCK resistors) are 1k ohm (5%). You can get the mini's (like 1/4w?) and they will work fine, not talking a lot of current here.
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1984 300D Turbo - 4-speed manual conversion, mid-level resto 1983 300D - parts car 1979 300TD Auto - Parts car. 1985 300D Auto - Wrecked/Parts. ========================= "If you don't know where you are going, any road will get you there". Lewis Carrol Last edited by TomJ; 10-17-2003 at 11:38 AM. |
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