Equalizer schematics

lduarte1973 · 6th March 2009, 10:46 AM

I need a simple equalizer schematic with audiophile quality components.thanks in advance.

audioDIYer · 6th March 2009, 10:52 AM

Olá Luis,

Audiophile systems don't like equalizers... Neither me!

You need it to correct bass levels?

Um abraço

CeeVee · 6th March 2009, 01:28 PM

Anyway Luis,

I personally would always suggest a parametric one.

...will look up my old work,...built one once...very nice !
Sold it because good recordings and good audio gear don't need 'em.

lduarte1973 · 6th March 2009, 02:59 PM

I need to correct medium and high frequencies , for bass i have a JBL subwoofer. Anyway i cant listen to music without my beloved equalizer, now i have a technics 5band equalizer , but i would like to build a customized one.

audioDIYer · 6th March 2009, 03:04 PM

Luis,

How are your walls? Empty? Do you have large windows?
These contribute to a awfull sound.
Maybe the problem is your listening room.
I had that problem and was solved with some simple techniques

edit:
or maybe more than simple techniques

http://www.diyaudio.com/forums/showt...90#post1597790

lduarte1973 · 6th March 2009, 06:12 PM

i would like to control these frequencies :

63, 110 , 150 , 315 , 1k , 2.5k , 3.2k , 6k , 12.5k , 13.4k

i cant do anything with the walls or the wife will end my audiophile problems by shooting me...

Conrad Hoffman · 6th March 2009, 06:59 PM

A quick Google search turned up a bunch of schematics. IMO, the reason everybody jumped on other solutions is that the things that are typically wrong can't be fixed with an equalizer. Still, if you can't do anything else, it's better than doing nothing. Any equalizer will be a bank of filters, and it's up to you to simply substitute better components. Filters like very high quality film capacitors and good op-amps. I'd use the National LME parts. I used to have a Soundcraftsman equalizer, and I think that used LC filters. The problem there is finding decent inductors. I'd stick with the usual RC circuits. As I remember, I spend hours adjusting the thing, driving my wife crazy. When I got rid of it, she swore I'd never own another equalizer.

willysan · 6th March 2009, 07:53 PM

Many equalizers share a similar topology: a series of bandpass filters with adjustable gain and built around an operational amplifier to spare the use of inductors.
National Semiconductor has many examples as applications of high quality operational amplifiers.

audioDIYer · 6th March 2009, 08:36 PM

Luis, if you are going to 'equalize' audio signals (yes, wife factor is important), please read Rane's documentation: http://www.rane.com/library.html
Search for 'equalizers' near the end...
It's a good starting point.

Like this: http://www.rane.com/note101.html

6th March 2009, 10:46 AM	#1
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	Equalizer schematics I need a simple equalizer schematic with audiophile quality components.thanks in advance. __________________ Hey ! just because i´m going bald doesnt mean i cant like hair metal

6th March 2009, 02:59 PM	#4
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	I need to correct medium and high frequencies , for bass i have a JBL subwoofer. Anyway i cant listen to music without my beloved equalizer, now i have a technics 5band equalizer , but i would like to build a customized one. __________________ Hey ! just because i´m going bald doesnt mean i cant like hair metal

6th March 2009, 06:12 PM	#6
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	i would like to control these frequencies : 63, 110 , 150 , 315 , 1k , 2.5k , 3.2k , 6k , 12.5k , 13.4k i cant do anything with the walls or the wife will end my audiophile problems by shooting me... __________________ Hey ! just because i´m going bald doesnt mean i cant like hair metal

6th March 2009, 06:59 PM	#7
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	A quick Google search turned up a bunch of schematics. IMO, the reason everybody jumped on other solutions is that the things that are typically wrong can't be fixed with an equalizer. Still, if you can't do anything else, it's better than doing nothing. Any equalizer will be a bank of filters, and it's up to you to simply substitute better components. Filters like very high quality film capacitors and good op-amps. I'd use the National LME parts. I used to have a Soundcraftsman equalizer, and I think that used LC filters. The problem there is finding decent inductors. I'd stick with the usual RC circuits. As I remember, I spend hours adjusting the thing, driving my wife crazy. When I got rid of it, she swore I'd never own another equalizer. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

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6th March 2009, 10:52 AM	#2
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	Olá Luis, Audiophile systems don't like equalizers... Neither me! You need it to correct bass levels? Um abraço

6th March 2009, 01:28 PM	#3
CeeVee diyAudio Member Join Date: Dec 2006	Anyway Luis, I personally would always suggest a parametric one. ...will look up my old work,...built one once...very nice ! Sold it because good recordings and good audio gear don't need 'em.

6th March 2009, 03:04 PM	#5
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	Luis, How are your walls? Empty? Do you have large windows? These contribute to a awfull sound. Maybe the problem is your listening room. I had that problem and was solved with some simple techniques edit: or maybe more than simple techniques http://www.diyaudio.com/forums/showt...90#post1597790

6th March 2009, 07:53 PM	#8
willysan diyAudio Member Join Date: Dec 2005 Location: Buenos Aires	Many equalizers share a similar topology: a series of bandpass filters with adjustable gain and built around an operational amplifier to spare the use of inductors. National Semiconductor has many examples as applications of high quality operational amplifiers.

6th March 2009, 08:36 PM	#9
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	Luis, if you are going to 'equalize' audio signals (yes, wife factor is important), please read Rane's documentation: http://www.rane.com/library.html Search for 'equalizers' near the end... It's a good starting point. Like this: http://www.rane.com/note101.html

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