Advice for 7 band EQ (or more )

[nonoxxx]

Hello,

I'm planning to get or build an

equalizer with faders ( like boss GE 7 ) ,and I find a kit using 2 BA3812L , I would like to know in terms of audio quality how these chipsets will compare to a modified Boss Ge-7 ( with BB2134 and film caps) 

here is the kit http://www.op-electronics.com/en/equalization/744-10-band-graphic-eq-kit-8000744261257.html

Thanks

[Mark Hammer]

I don't know what you mean when you say "band equalizer".  Do you mean something to EQ the sound system of a band, or is there something missing from what you wrote, and you meant to write "7-band equalizer" or something like that?

[nonoxxx]

sorry , I missed some words
In fact I want to build an EQ with at least 7 bands with faders ( not rotary pots)

[anotherjim]

I cannot advise on the sound quality, and I can't see a schematic link for that kit. For that chip, it says "The BA3812L features low distortion, low noise, and wide dynamic range, and is an ideal choice for Hi-Fi stereo applications." so it ought to be capable.

If that design has a proper guitar high impedance input, then I'd guess you just populate components for the 63Hz to 4Khz bands to cover guitar use and be good to go.

[roseblood11]

I'd suggest to buy a used GE-7 and do the well-known mods to improve the sound quality and reduce the hiss.

[PRR]

> I can't see a schematic link for that kit

http://www.op-electronics.com/en/equalization/744-10-band-graphic-eq-kit-8000744261257.html
Download
10-band Graphic EQ datasheet
Page 3

Basically the chip's reference implementation.

Input impedance not specified?? I'd investigate. Or run a 12V-15V supply, add a TL07x, and take a gain of 4 in front and 1/4 in back, for significant better S/N.

[nonoxxx]

The thing that bother me with the GE7 is the fact of buying a 50 bucks  pedal (used price in France ) and have to replace most of the components 

If I remember correctly there is 3 Tl022 to swap for Burr Brown 2134 and more thant 10 caps . Also the in line chip but I 'm not sure

[roseblood11]

50€ is a bit too much. But it's worth it. Have you ever made the slots for 8 faders by hand?

[nonoxxx]

No and I think I will never try