MCPaudiTT got a question for ya
07-16-2005, 08:40 PM
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MCPaudiTT got a question for ya
12V Fixed-Voltage Regulator. Hooking this up, the common is the negative?? Also, do i need one of these for each LED project i do??
I wish i had pix of jeff's turnsignals tho, cause i think my way is alot harder then what he did. Im actually curving the mother board so it is tight to the turnsignal. Hope that im not doing this the wrong way or to hard there. Also, i got my multi-colored angel eyes about finished. Thats why im asking if i need the regulator for each thing i do
I wish i had pix of jeff's turnsignals tho, cause i think my way is alot harder then what he did. Im actually curving the mother board so it is tight to the turnsignal. Hope that im not doing this the wrong way or to hard there. Also, i got my multi-colored angel eyes about finished. Thats why im asking if i need the regulator for each thing i do
07-17-2005, 03:03 AM
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He's in Europe on biz for 2 wks - may have limited forum access.
Check out this folder for help?<ul><li><a href="http://public.fotki.com/mcphill/audi_stuff/bipes_stuff/">http://public.fotki.com/mcphill/audi_stuff/bipes_stuff/</a></li></ul>
07-17-2005, 04:35 AM
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I would use one for each. I did not see a voltage regulator in Jeffs systems, though... His
parking LEDs do curve flush to fit the light as well. He used a wood backer and screwed the solder board to it to keep the flex.
For the voltage regulator, you do need to keep in mind the amperage running through, especially if you have several parallel circuits. Make sure you don't overpower it, and if it runs hot, use a heat sink.
One more thing I forgot to mention. On the turn signals, you will need to put a power resistor in parallel to everything else to get the flash rate correct. I think Jeff's is a 10 ohm.
For the voltage regulator, you do need to keep in mind the amperage running through, especially if you have several parallel circuits. Make sure you don't overpower it, and if it runs hot, use a heat sink.
One more thing I forgot to mention. On the turn signals, you will need to put a power resistor in parallel to everything else to get the flash rate correct. I think Jeff's is a 10 ohm.
07-17-2005, 06:26 AM
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LEDs are current sinks...
using voltage regulators and dropping resistors to power them is a crude method.
To do it correctly, you need to maintain a constant current, usually 15-20 ma, through the LED.
The link points to a simple way to make a constant current source from a readily available adjustable voltage regulator. With automotive power (nominally 13.8 volts), it should support up to about 8 LEDs in a string.<ul><li><a href="http://www.onsemi.com/pub/Collateral/AND8109-D.PDF">Constant Current using LM317</a></li></ul>
To do it correctly, you need to maintain a constant current, usually 15-20 ma, through the LED.
The link points to a simple way to make a constant current source from a readily available adjustable voltage regulator. With automotive power (nominally 13.8 volts), it should support up to about 8 LEDs in a string.<ul><li><a href="http://www.onsemi.com/pub/Collateral/AND8109-D.PDF">Constant Current using LM317</a></li></ul>
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