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halvin
Joined: 01 Dec 2006
Posts: 4
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 02 Dec 2006 8:25 VU Led meter |
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Is there a simple way to connect VU led to computers?
If yes then tell me how can i make a 100% circuit+ the software.
tHANKS IN ADVANCE
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izua
Joined: 31 Oct 2006
Posts: 63
Helped: 2
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| 03 Dec 2006 7:09 Re: VU Led meter |
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basically, there are 2 approaches. you either let the computer do the actual computing, or you put some ICs, which will be fed the input signal (probably amplified) after you pass it for each band through a band-pass filter. this band-pass filter will actually determine on what frequency each channel will "pop" or "dim". An example of such IC is AN6884.
There's one advantage into using a computer instead of feeding directly the signal - you can make the analyser/vu meterdisplay stuff when it's idle. Aaron's website had an example of one with direct signal feeding http://www.aaroncake.net/circuits/3chspec.htm.
If you want to go with the computer, it's not that easy. You'll first need to understand how to make a plugin for the software that's playing the music. I'd suggest winamp, since it's easiest. Then, you'll need some kind of programming language (I use C++ for my stuff, i also have some dll to interact with the parallel port, let me know if you want it), to write the actual code, that will generate the output in the vu-meter. if there are several channels, you'll also need some clock circuit, since you won't be able to set each individual led from a port (parallel has 8 + 4). Also, no led can be driven by the parralel port, except perhaps very small ones. So you'll need buffering/amplifing of the signal.
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nikifena
Joined: 11 Dec 2003
Posts: 115
Helped: 8
Location: Bulgaria
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| 13 Dec 2006 23:32 Re: VU Led meter |
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http://1176neve.tripod.com/id12.html
simple as possible 
whti pcb
Good luck!
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kronos2k3
Joined: 14 Dec 2006
Posts: 27
Helped: 4
Location: Argentina -> Cordoba -> Villa Marķa
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| 15 Dec 2006 13:09 Re: VU Led meter |
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Use a LM3914 is a 10 Led VU Meter, it's easy to build.
Regards
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Externet
Joined: 29 Jan 2004
Posts: 56
Helped: 2
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| 16 Dec 2006 4:27 Re: VU Led meter |
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The correct integrated circuit for VU display is not LM3914. It is LM3916
National has the data sheet and application notes.
Miguel
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nikifena
Joined: 11 Dec 2003
Posts: 115
Helped: 8
Location: Bulgaria
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| 16 Dec 2006 9:04 Re: VU Led meter |
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another uv design
http://www.akustische-kunst.org/audio/peakmeter.html
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