Audio Spectrum (light Organ)

Hi All,

I need a little guidance, I have be playing around for the last few day with making a Audio Spectrum (light Organ). I fallowed this write-up.

http://radicalrumpus.wordpress.com/2012/08/11/final-prototype-audio-spectrum-write-up/

I got it working and all but I was wondering if there was any way to have it not be so Volume dependent.

What I am trying to say is. I have to have my MP3 player all most at full volume to get all 7 leds to react.

Doing so make the Music sound harsh.

I was thinking about adding a small amp with volume control to the speakers, but still not helping with the led Issue.

Thanks

Looks like this post was based on my stuff (http://www.baldengineer.com/projects/msgeq7-simple-spectrum-analyzer/).

I can't read fritizing diagrams. Well, I'm not patient enough. Since they didn't post a proper schematic, I assume they're probably following mine.

If your chip is too volume sensitive, you can reduce the 22Kohm input resistors. I'd try 10k then 5k, but not go below 1k.

Thanks for you reply, I will give it a try.

Also thanks for your schematic, I found that the other night and is what I used. It was very helpful.

Thanks once more.

Now that I got it working I was wondering what I could do to clean up the single some. Richer Bass and Highs (By the way I have n0 Idea what I am talking about)

I went on a shopping spree at online at sparkfun and Radio Shack . I have all these IC’s and parts. Now I am just trying to see what they can do.

I learn better by doing.

Any input is welcome

Thanks

How about adding a preamp with AGC?

Have a google for "Baxandall Tone Control" - a simple Bass/Treble control to boost or cut the low and/or high frequencies.

It's a simple enough circuit and gives pretty damn good results considering. Makes the whole sound much richer :)

Thanks, Give it a go.

polymorph: How about adding a preamp with AGC?

Not sure what you mean by AGC.

kculm:

polymorph: How about adding a preamp with AGC?

Not sure what you mean by AGC.

Automatic Gain Control - make it get louder by itself when the sound is quiet, and quieter as the sound gets louder.

I need help Please,

I have been looking all over the Net for a basic AGC layout something for someone just starting out. I have found tons of designs but none I could make work on my BreadBoard.

If any one knows of or has a very basic design can you please let me know.

Thanks

http://www.nlvocables.com/blog/?p=803

Since the code reads each of the channels' values from the chip, you can compensate for the overall volume in software after reading but before displaying. Find the largest value and use that to set the 100% point in the call to map() ??

MarkT: Since the code reads each of the channels' values from the chip, you can compensate for the overall volume in software after reading but before displaying. Find the largest value and use that to set the 100% point in the call to map() ??

I am totally green at this, can you explain or maybe give an example.

please and thank you.

-KC

Slightly off topic but a dc controlled (read digipot) volume control with bass and treble controls and balance can be had in the National Semiconductor LM1036. I got 4 a while back as samples based on a similar issue.

Doc

There is a forum topic http://forum.arduino.cc/index.php?topic=124992.0 that references http://hackaday.com/2012/09/05/70-watt-amp-uses-an-attiny/. I haven't built one of these, but I'm sure it actually works fairly well. My point, if the tiny can do this, it shouldn't be hard to make an UNO, Nano, etc. do something similar with some built in AGC code. The analog voltage is already being measured, so you just need to average the readings over a certain period. Or you could use a half wave rectifier circuit and measure the rectified /smoothed signal and use that for controlling the gain/output. I have some of the MSGEQ7 chips, but have had too many other projects in the way to get to play with them yet.

Whoops..... XD..... here is the actual link to the 70w class d amp http://rdimitrov.twistedsanity.net/blog/show.php?entry=Microcontroller%20Class%20D%20Amplifier.