DIY Graphic equalizer?

coldfuzion76 · 9th March 2008, 08:48 AM

I'm piddling around with an old Technics amp I got at an auction for parts, and while I was specing out some of the chips, I ran across the chip that serves as the EQ. It's a m5226p. So I dug around and came up with the datasheet, and was wondering if anyone out there had messed with this kind of thing and whether or not it would be worthwhile...

Nordic · 9th March 2008, 09:38 AM

Certainly looks usefull, I started toying with a LED based "spectrum analyzer" display, but got stuck at the filters this week. Everything after the filters was easy enough.

mannycc · 17th March 2008, 04:47 PM

----------------------------------------------------------------------------------
I ran across the chip that serves as the EQ. It's a m5226p. So I dug around and came up with the datasheet, and was wondering if anyone out there had messed with this kind of thing and whether or not it would be worthwhile... [/B][/QUOTE]
----------------------------------------------------------------------------------

The chip internal is showing transistors configured as gyrators. I first encountered similar design as preamp using both discrete parts and opamps (lm324n)! The center frequency response were really good and you can distinguish the big difference, the gain inthis case was fixed by internal resistor. Sure it will be worth a try.

coldfuzion76 · 18th March 2008, 12:16 AM

I was beginning to wonder if anyone had any ideas about this thing. I know that tone controls and I'm assuming eq's are kind of taboo right now, but I always like to have adjustability. May give this thing a shot after I get my amp portion done.

jaycee · 18th March 2008, 09:45 AM

I say it's personal taste. If you feel the need to adjust slightly with an EQ, use one. Some people cant justify rearranging their whole house to get a better sound

My only beef with that chip is that it's single rail and therefore capacitor coupled, but give it a go. Just build a "Defeat" switch into the circuit to take it out easily.

If you really like having an EQ you could then move on to building a better one with decent opamps. Here has a few nice circuits.

17th March 2008, 04:47 PM	#3
mannycc diyAudio Member Join Date: Jan 2008	Re: DIY Graphic equalizer? ---------------------------------------------------------------------------------- I ran across the chip that serves as the EQ. It's a m5226p. So I dug around and came up with the datasheet, and was wondering if anyone out there had messed with this kind of thing and whether or not it would be worthwhile... [/B][/QUOTE] ---------------------------------------------------------------------------------- The chip internal is showing transistors configured as gyrators. I first encountered similar design as preamp using both discrete parts and opamps (lm324n)! The center frequency response were really good and you can distinguish the big difference, the gain inthis case was fixed by internal resistor. Sure it will be worth a try.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
5 Band Graphic Equalizer	NSLogan	Chip Amps	2	17th June 2009 04:52 AM
Polystyrene caps in a graphic equalizer	stpa	Solid State	3	10th April 2008 04:19 PM
Graphic equalizer	Buzzy	Parts	1	24th July 2007 08:55 PM
Graphic Equalizer design HELP needed	hrg2112	Solid State	4	21st December 2006 08:06 PM
Graphic Equalizer	Johnny25	Parts	5	29th March 2006 06:33 PM

New To Site?	Need Help?
Register to Participate Search Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


<a rel='nofollow' href='http://www.diyaudio.com/openx/www/delivery/ck.php?n=aa5cb2e9&cb=187717' target='_blank'><img src='http://www.diyaudio.com/openx/www/delivery/avw.php?zoneid=3&cb=187717&n=aa5cb2e9' border='0' alt='' /></a>	We're saving for a new server - help us to serve you by Donating Today and become a friend with benefits! Ads on/off / Custom Title / 2009 Tshirt / More PMs / Bigger Images / Advanced printing

9th March 2008, 09:38 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	Certainly looks usefull, I started toying with a LED based "spectrum analyzer" display, but got stuck at the filters this week. Everything after the filters was easy enough.

18th March 2008, 12:16 AM	#4
coldfuzion76 diyAudio Member Join Date: Jan 2008	I was beginning to wonder if anyone had any ideas about this thing. I know that tone controls and I'm assuming eq's are kind of taboo right now, but I always like to have adjustability. May give this thing a shot after I get my amp portion done.

18th March 2008, 09:45 AM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	I say it's personal taste. If you feel the need to adjust slightly with an EQ, use one. Some people cant justify rearranging their whole house to get a better sound My only beef with that chip is that it's single rail and therefore capacitor coupled, but give it a go. Just build a "Defeat" switch into the circuit to take it out easily. If you really like having an EQ you could then move on to building a better one with decent opamps. Here has a few nice circuits.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)