LED's... sound reactive?

stahlm004443 · 30th August 2011, 07:22 PM

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!!!

sofaspud · 30th August 2011, 07:36 PM

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.

simon7000 · 30th August 2011, 08:18 PM

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.

stahlm004443 · 31st August 2011, 11:49 AM

They come with a resistor, would that be the right one? X

simon7000 · 31st August 2011, 02:14 PM

Probably not. Too small is very bad, too large will not damage anything.

sofaspud · 31st August 2011, 08:25 PM

Wouldn't LEDs across the output have a reverse voltage problem?

simon7000 · 31st August 2011, 08:49 PM

Quote:

Originally Posted by sofaspud

Wouldn't LEDs across the output have a reverse voltage problem?

Yes, but limited current will prevent them from burning up.

stahlm004443 · 1st September 2011, 06:46 PM

so would i need only one resistor in a series circuit of 5 led's?

simon7000 · 1st September 2011, 07:10 PM

Quote:

Originally Posted by stahlm004443

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.

stahlm004443 · 1st September 2011, 07:37 PM

that went in one ear and out the other!!! haha,

are they defiantly nessisary?

30th August 2011, 07:22 PM	#1
stahlm004443 diyAudio Member Join Date: Aug 2011	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!!!

30th August 2011, 07:36 PM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	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. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

31st August 2011, 08:25 PM	#6
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	Wouldn't LEDs across the output have a reverse voltage problem? __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

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30th August 2011, 08:18 PM	#3
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	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.

31st August 2011, 11:49 AM	#4
stahlm004443 diyAudio Member Join Date: Aug 2011	They come with a resistor, would that be the right one? X

31st August 2011, 02:14 PM	#5
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	Probably not. Too small is very bad, too large will not damage anything.

1st September 2011, 06:46 PM	#8
stahlm004443 diyAudio Member Join Date: Aug 2011	so would i need only one resistor in a series circuit of 5 led's?

1st September 2011, 07:37 PM	#10
stahlm004443 diyAudio Member Join Date: Aug 2011	that went in one ear and out the other!!! haha, are they defiantly nessisary?

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