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leds with audio

 
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terorerorista92
Newbie


Joined: 16 Feb 2007
Posts: 2

PostPosted: Fri Feb 16, 2007 10:11 am    Post subject: leds with audio Reply with quote

i dont know how to formulate the quiestion : I want to put led and when my music is on they will light up and down , according to the music please help !
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Feb 16, 2007 2:43 pm    Post subject: Re: leds with audio Reply with quote

terorerorista92 wrote:
i dont know how to formulate the quiestion : I want to put led and when my music is on they will light up and down , according to the music please help !


There are many ways of doing it. You could bias a single transistor and simply power some LEDs with it. I would add a transistor base and LED current limiting resistors if I were to build this circuit though.
http://www.instructables.com/id/E1K7SJ2ZG6ERIE36TP?ALLSTEPS

Here is another idea
http://www.instructables.com/id/E0K3YAYGI1EP4HD4U4/
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greenhacks
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Joined: 02 Oct 2007
Posts: 2

PostPosted: Tue Oct 02, 2007 1:36 pm    Post subject: Reply with quote

try this and leave off the resisters. you can get everything at the dreaded radio shack.


http://www.acidmods.com/Wiki/tiki-index.php?page=PSP%20Sound%20Mod
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nexusone
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Joined: 25 Oct 2007
Posts: 4

PostPosted: Thu Oct 25, 2007 1:04 pm    Post subject: They are called bar graphic displays Reply with quote

Are you looking for them to move to audio level like of the right and left channel or what to display the frequency spectrum?

The following link is to a nice chip for this application, easy to hook up.

http://www.national.com/mpf/LM/LM3914.html

Eric
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Project_Nightmare
HG Master


Joined: 12 Oct 2007
Posts: 119
Location: Gig Harbor, WA

PostPosted: Thu Oct 25, 2007 8:49 pm    Post subject: Reply with quote

you can just say: try looking into vu meters (aka sound meters) and that there are a lot of circuits online showing how to build one. Cool
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