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Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Sorry in advance if some of my questions are a bit easy, i don't have a lot of experience with led's.
So today I installed a kick a$$ sound system in my car and I thought to myself, "How can I make this listening experience even better?" ... My answer: lighting!
A little while ago i bought 2000 led's for projects Unfortunately there are not any specs to go along with these so I have no idea what the led's rated voltage/current is. Can anyone help me out? is it pretty much the same for all 3mm red led's?
Lets just say that they are rated for 3v at 20ma, should I wire three led's in series with a 1.5k resistor?
Can I point to point solder or is it a better idea to use prototyping board?
Furthermore, would it be difficult to make them sound activated? I.E. they go along with the music. Anyone know of any good circuits for this?
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
It's hard to say what voltage and current they are rated at, the part number does not really give any good results and diffused 3 mm leds range from 1.5 - 2.6 Volt at 15 mA - 30 mA...
Since you have 2000, experiment till you get the light from it that you want, or till it explodes.
The wikipedia page for LEDs has a chart of color to voltage, most indicator LEDs run ~20-30 ma. There are several color/voltage/current charts on the internet, I usually use this book, practical electronics for inventors , as it has one such handy dandy table.
If you want some simple circuits the various Forrest Mims books are a good start. If you want something real fancy, the Arduino seems to have the widest user support base which makes learning easier since there are endless examples of people's projects.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
The old rules of thumb for led voltage worked as the colour was determined by the band gap voltage/energy level. Modern (Chinese/eBay) leds that I have bought use blue/uv diodes with phosphors, so even a red led can drop typically 3.1v etc. They also seem more electrically 'fragile'.
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sound activated LED's
