Go Back   TechArena Community > Hardware > Hardware Peripherals
Become a Member!
Forgot your username/password?
Tags Active Topics RSS Search Mark Forums Read

Reply
 
Thread Tools Search this Thread
  #1  
Old 24-02-2012
Member
 
Join Date: Feb 2012
Posts: 100
How does one build a Visual Equalizer

I want to build a visual equalizer for audio as my college project. It should not be a complex one but just a simple one with around 6 to 7 bars. I don?t have knowledge about the physics and mathematics required to create it but there must be some way to make it. Can anybody tell me how do I build it?
Reply With Quote
  #2  
Old 24-02-2012
Member
 
Join Date: Jul 2011
Posts: 555
Re: How does one build a Visual Equalizer

First of all you need is a LM3914 dot/bar driver to wire 10 LED bar graph in green/red or green/red/yellow format. For multiple bars, one need to build filters for passing an isolated signal to specific frequency of the LM3914 dot/bar driver. But it isn?t as easy as it seems. One has to compute value to get proper capacitor, inductor and resistor frequency values. To transfer signals of low frequency of 4 KHz a DSL filter can be used.
Reply With Quote
  #3  
Old 24-02-2012
Member
 
Join Date: Nov 2010
Posts: 444
Re: How does one build a Visual Equalizer

The main disadvantage of using LM3914 dot/bar driver is that it limits the signals to linear resistance ladder which is hard to customize. You can wire it yourself to voltage comparators. The voltage scale is up to you. As standard audio signals are of frequency of 1V, an Op-amp running in each of LM3914 can be used. Without it the results will be poor.
Reply With Quote
  #4  
Old 24-02-2012
Member
 
Join Date: Jul 2011
Posts: 376
Re: How does one build a Visual Equalizer

I recommend you to create two voltage following configurations to handle both channels and run them in summer voltage configuration. With the use potentiometer in combination with above mentioned op-amp you can achieve a variation in frequency of Audio signals. For filtering of signals, I suggest you use only capacitors and resistors as they are cheap and give good results.
Reply With Quote
Reply

  TechArena Community > Hardware > Hardware Peripherals
Tags: , , ,



Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads for: "How does one build a Visual Equalizer"
Thread Thread Starter Forum Replies Last Post
Visual Aid for Mouse gesture is Missing in opera 12 alpha build Prabhukumar Technology & Internet 8 13-11-2011 02:13 PM
Gingerbread?s new application known as Equalizer Virr Portable Devices 4 15-05-2011 04:11 PM
Equalizer for Nokia N8 RastogiJI Portable Devices 5 30-10-2010 05:46 PM
Realtek equalizer Crista Monitor & Video Cards 5 10-09-2010 12:59 AM
Compare Visual Studio 2010 and Visual Web Developer Express Zacharia Software Development 5 28-01-2010 04:27 AM


All times are GMT +5.5. The time now is 05:00 AM.