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16-LED sound reactive setup not bright enough! - Page 2

post #11 of 25
So after taking my meter to my audio jack on my computer i found that it is indeed outputting AC voltage, but i also found its only putting out about 1 volt on avg. If you don't mind i can make up a simply circuit layout that will convert it to dc and jump up the voltage to around 4-5 volts. I would also consider building it for you but i don't think you'd want to pay for the shipping from the states to you. But that's your decision. I'm going to go ahead and create the circuit and you can decide from there.
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post #12 of 25
Thread Starter 
1v should be enough to trigger the transistor as it needs 0,7v according to the datasheets. I compared my setup with some people on youtube and it seems that they are getting far brighter flashes from the LEDs, although they are only using 4 or 3 in series running from a 9v battery.

Sending the stuff would probably cost more than buying a commercial setup so I don't think that would be beneficial.
post #13 of 25
OP what's your goal for this? Do you need 16 LEDs? If you can't get the components you may be able to simply drive them off your amp/speakers.
Quote:
Originally Posted by martinlink View Post

BTW, I'm not from anywhere near a radioshack, so I'm gonna have to find a local shop that sells this stuff. And also, price is an issue as it's not something a uni student can go throwing loads of money at wink.gif If there is a way to do it without any extra components, I'm all ears!
Not unless you can find these components in a device you're willing to scrap. I'm not sure about availability where you are but I'm sure there's a site that you can order them from for under $10 inc shipping.
Mouser, DigiKey, and JameCo do int'l shipping (may have min purchases tho)
Quote:
Originally Posted by martinlink View Post

I have no board for the components as it would take up loads of space and I'm kind of a cable management freak.
If at all possible I recommend getting a breadboard. They come smaller than 5x10cm and, going with the quote above, will save you money in the long run.

If you don't have this figured out in a week shoot me a pm. I'll have access to my electronic components after finals (this) week and I can try to find a solution.
Edited by BlackVenom - 12/9/12 at 3:10pm
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post #14 of 25
Thread Starter 
My goal is basically to make my current 16 LED array, which is already built and installed into my PC (see pic in gallery) a bit brighter when in "sound-reactive" mode. The pics in my gallery are taken in the "always on" mode and are nice and brightly lit. However, in the sould reactive mode, the LEDs are very dim and don't light up almost at all.

Basically, everything is up and working perfectly, just not bright enough.
See videos here: http://www.youtube.com/watch?v=-TaZH6v2-gc <- always on mode, nice and bright
http://www.youtube.com/watch?v=b5nWAabP9ZE <- sound reactive mode, faint blinking visible, not even 1/3 as bright as in always on mode.

Other vids with the same setup have their LEDs light up much brighter IMO (http://www.youtube.com/watch?v=rux9_XTbFLk)
post #15 of 25
Any luck with this? I managed to forget that my soldering iron and more weren't actually here. Still got all I need to figure this out though. Post back if you're still trying to figure it out and I'll reply.
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post #16 of 25
Thread Starter 
I kinda left it at where it was earlier...

I noticed that when I talk into my microphone (with mic boost +20% on), the LEDs light up noticeably brighter, but after like 10 seconds, begin to fade away again. After that, I have to wait a few minutes before the lights start to come on normally again. Seems like the transistor gets "tired" after the much larger current when using the mic...

So I'd be happy to hear any more thoughts on this as I haven't found a solution yet.
Thanks!
post #17 of 25
Maybe the jack won't put enough out. You can get sinks for the transistor and that may help it last longer - you can also make one out of thin scrap metal and a drill. I didn't realize the audio was coming out as ac until this post and I'm thinking that might be the issue.

EDIT: The problem we have is that this circuit sucks and can't do what we need right. I am working on a solution to beef up output a bit but I wouldn't expect much. If you're willing to buy more parts (and try a more complicated circuit) I can post what i've found. Sound to light... nothing comes easy.
Edited by BlackVenom - 12/28/12 at 10:39pm
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post #18 of 25
Thread Starter 
The problem is with the extra parts. I'm willing to try anything that doesn't involve looking for and buying more parts.

The main thing to note here is that it's plugged into the front panel, which is about 30% more loud (and more bright with the LEDs) than the rear panel, so it must be the audio jack that's holding me up. it's the onboard HD audio header on my P5QL Pro. I don't have an external sound card to try it with, neither do I have an amplifier which seems to make the lights brighter and more responsive in many youtube videos.
post #19 of 25
Well do you have any extra parts? Also measure the output of both front and rear ports.
Other than brightness are you having other problems?
Edited by BlackVenom - 12/30/12 at 5:57pm
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post #20 of 25
Thread Starter 
The setup has absolutely no other problems; everything works ideally except for the brightness.

Only extra parts I have are strips of wires and some spare LEDs...

And the only multimeter I had access to previously was borrowed and I don't have it at the moment. But I can say for sure that the front port is louder when listening with the same headset.
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