Sound reactive led

Step 5 Crank it

turn you speakers up and play music until the led is reactive. It starts being reactive at about 25%, but then (for me) it was best at half as loud as the speakers can go.

Comments

[autokhin010]

thank you so much!

[hoihoi151]

B very careful. if u have a post amp from ur music player 2 ur speaker this is very bad. if u r outputting more than 5volts 2 ur speaker then u can blowup the led. just putting in a caution

[superrust]

sorry i'm new to electronics. could this danger be avoided by adding a resistor to the led?

[Sagar Gondaliya]

i like things that go BOOM!

[Ben The Builder]

LED's don't boom, they burn out, like light bulbs, but I like them too

[bkjkhker]

Actually, the day before yesterday me and my friend were hooking up some LED's and accidentally sent a straight 9v current through a 3v LED and after about 2 seconds it popped completely in half and launched across the room. It was pretty sweet haha :P

[nodoubtman]

thats why you need a resistor :o)

[Ben The Builder]

It must have been High Current, just a nine volt battery will semi melt the inside, rendering it useless, if it was a higher current battery like a large lead acid battery, it'll blow up anything you connect it to

[pescados666]

Would it be possible to use a microphone connected to a preamp with the output from the preamp going to LED lights? Also, you might get better results if you didn't connect the LED to the tweeter because it is connected to a filter (the little capacitor) that only lets it receive high pitched sounds. It would be better to connect it in the wire before the midrange speaker and connect it to an inductor on the positive line so that it only lights when the bass hits. You would have to tune it with different sizes of inductors, and there's different levels for the filters that involve using a capacitor on it, but shouldn't be needed just for a light.

[npa4863]

I did the same instructable but i used some portable ipod speakers... i also used 2 red 12v leds for mine, in parallel with led holders and mounted it in the casing so no lose wires... i like my set cuz I'm drawing so much power that the power led goes slightly dim when i crank it its funny.... so any way i'm going to post a link to this instructable in case i happen to pick up any on looking to do up some PC speakers and maybe you could put up a link to mine for any one wishing to do ipod speak's, if you want...

[Ben The Builder]

One thing you guys could try, and I'm not 100% how it works, since I don't have one to test it with, but I think you put the output from a headphone jack (Headphones would work) and then you put however many volts your LED takes and if you hook it up right, the electricity from the speaker increases or decreases the voltage flowing from the + lead to the - lead thus proportionally varying the brightness of LED, there's an instructable on it somewhere

[-Aj-]

yeah that is the best way, it requires a transistor. you have a separate power supply for the led, then the signal from your audio controls the transistor and varies the power to the led proportionally. im sure there is an instructable lol

[treinengek]

can you attach more than 1 led?

[guyfrom7up]

you could, put in in series, but you will notice distortion. See circuit below.

[treinengek]

OK thanks

[guyfrom7up]

oops, my bad, don't put them in series, I meant paralel, sorry for the bad advice...

[treinengek]

no problem but thank you that you replied when I post a comment usually nobody replies.

[broho]

i dunno why people are saying this sucks, im thinking of puting a few in my lap top speaker vents, would that work?

[guyfrom7up]

I don't see why it wouldn't. I was actually going to do that to my desktop speakers but I don't have any hot glue sticks right now, rats.

[guyfrom7up]

oh, and before you install it permently I'd see if it works with your speakers first, if it doesn't you have to use a lm386 chip.