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Old 9th March 2008, 07:48 AM   #1
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Default DIY Graphic equalizer?

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...
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Old 9th March 2008, 08:38 AM   #2
Nordic is offline Nordic  South Africa
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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.
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Old 17th March 2008, 03:47 PM   #3
mannycc is offline mannycc  Singapore
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Default Re: DIY Graphic equalizer?

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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]
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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.
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Old 17th March 2008, 11:16 PM   #4
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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.
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Old 18th March 2008, 08:45 AM   #5
jaycee is offline jaycee  United Kingdom
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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.
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