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Old 30th August 2011, 08:22 PM   #1
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Talking LED's... sound reactive?

so i was wondering...

im in the process of constructing a battery powered boom box, and i got some leds to make it look nice :P

but if i wired them to the amp output so they go with the music would it affect the sound that much? i dont really want any distortion or loss of volume.

here are the LED's

there is tech spec on the page somwhere. but it means nothing to me lol.

thanks!!!
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Old 30th August 2011, 08:36 PM   #2
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I don't know exactly what you mean by "wired them to the amp output" but that doesn't sound correct. IMO what you want to do is feed a portion of the input to a separate LED driver circuit. Have a look at some online "color organ" circuits.
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Old 30th August 2011, 09:18 PM   #3
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You have to put a resistor in series with the leds or else they will distort the output. 1000 ohms 1/2 watt should be fine.
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Old 31st August 2011, 12:49 PM   #4
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They come with a resistor, would that be the right one? X
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Old 31st August 2011, 03:14 PM   #5
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Probably not. Too small is very bad, too large will not damage anything.
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Old 31st August 2011, 09:25 PM   #6
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Wouldn't LEDs across the output have a reverse voltage problem?
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Old 31st August 2011, 09:49 PM   #7
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Quote:
Originally Posted by sofaspud View Post
Wouldn't LEDs across the output have a reverse voltage problem?
Yes, but limited current will prevent them from burning up.
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Old 1st September 2011, 07:46 PM   #8
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so would i need only one resistor in a series circuit of 5 led's?
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Old 1st September 2011, 08:10 PM   #9
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Quote:
Originally Posted by stahlm004443 View Post
so would i need only one resistor in a series circuit of 5 led's?
Yes and a rectifier diode would be nice also a full bridge without a filter capacitor better still.
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Old 1st September 2011, 08:37 PM   #10
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that went in one ear and out the other!!! haha,

are they defiantly nessisary?
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