MXR Equalizer Schematics

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MXR Equalizer Schematics

Postby george giblet » 06 Jan 2009, 05:59

I've been sorting through some of my stuff over the holidays and you might be interested in these:

MXR 6-band EQ:
Image

MXR 10-band EQ:
Image

Here's the location of the missing parts which can be updated from any new gut shots:
Image

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Re: MXR Equalizer Schematics

Postby RnFR » 06 Jan 2009, 18:18

thanks george!
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

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Re: MXR Equalizer Schematics

Postby fosnal1950 » 06 Jan 2009, 19:03

Is there anyone who knows if there is a pcb available for the 6 or 10 band ?

I'm not very good at designing it for so many opamps.

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Re: MXR Equalizer Schematics

Postby Dirk_Hendrik » 06 Jan 2009, 21:57

As said before, thanks George.

Make those tapers linear. It's a linear cut boost app ;) (A "w" taper like in the TS tone control would be even nicer...)
Sorry. Plain out of planes.

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Re: MXR Equalizer Schematics

Postby fosnal1950 » 09 Jan 2009, 12:30

I have found a pcb and layout for the GE-7 but it's in pdf.

I can't show it here. Tried to convert it to jpg but all these so called free programmes add letters behind the converted file.

If anyone needs it mail me .

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Re: MXR Equalizer Schematics

Postby fosnal1950 » 09 Jan 2009, 16:14

Here you go : the site where I discovered it .

http://web.tiscali.it/boxsmt2clone2005/_web_boss_ge7/boss_ge7.htm


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Re: MXR Equalizer Schematics

Postby lolbou » 11 Jan 2009, 20:56

Hey,

I've been through this site already, but could not find the very linear faders that fit the PCB... Course I can modify them with an appropriate software, but does anyone know where to find these Boss style ones?

A bit off-topic maybe? Sorry about that... :|
- Are you a mod or a rocker?
- Uh, no, I'm a mocker.
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Re: MXR Equalizer Schematics

Postby nzino » 04 Feb 2009, 01:08

Hi
I need schematics of MXR 6 band EQ with footswitch (the latest one, black colured) to repair. Some one can help me??

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Re: MXR Equalizer Schematics

Postby mecmast » 20 Jun 2009, 17:30

any layout/pcbs plz?
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Re: MXR Equalizer Schematics

Postby Rocket Roll » 08 Sep 2009, 23:34

MXR 10-band EQ master volume mod:
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Re: MXR Equalizer Schematics

Postby shotgunn » 25 Nov 2010, 02:04

Better late than never... I just found this site. I have the PCB layout for the MXR-109.
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Re: MXR Equalizer Schematics

Postby mcraveri » 03 Dec 2010, 20:01

Hallo,
Does anyone have a layout with tracks?

Tanks
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Re: MXR Equalizer Schematics

Postby Lonkero » 04 Dec 2010, 02:42

Why some freq gain stages use 1458 and some that TL op-amp?
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Re: MXR Equalizer Schematics

Postby HTH » 28 Dec 2010, 15:15

Lonkero wrote:Why some freq gain stages use 1458 and some that TL op-amp?


noise specs?
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Re: MXR Equalizer Schematics

Postby O.B.Y » 29 Jan 2011, 20:53

does it verified?
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Re: MXR Equalizer Schematics

Postby Dirk_Hendrik » 29 Jan 2011, 20:57

No.
factory schems never do it verified.
Sorry. Plain out of planes.

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Re: MXR Equalizer Schematics

Postby O.B.Y » 06 Feb 2011, 02:57

Dirk_Hendrik wrote:No.
factory schems never do it verified.


so... have you built it?
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Re: MXR Equalizer Schematics

Postby Dirk_Hendrik » 06 Feb 2011, 19:59

Nope. I undid unverified it! Much less harder funstuff :horsey:
Sorry. Plain out of planes.

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Re: MXR Equalizer Schematics

Postby O.B.Y » 18 Mar 2011, 14:42

Dirk_Hendrik wrote:Nope. I undid unverified it! Much less harder funstuff :horsey:


ya i cant find for the potentiometer with lower value..

so can u give me for the solution??
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Re: MXR Equalizer Schematics

Postby Fix_Metal » 29 Mar 2011, 23:16

K guys, I'm in a good mood on today.
On today I just brought to new life the M108, including an LT1054 inside, a footswitch, MTB2, tantalium caps changed over film caps. In the past I tried to mod it adding volume and gain slide pots. I drilled the box and so on. Since I had cracked the original writings, I stripped the box and painted it new. Same blue but I have no clues on how to restore the original font/white writings.
Anyway, check this out. This is the original schematic for the M108 Blue Box Version. Mine had (once) written MXR Graphic Equalizer, as you can see in my pic.
Front.jpg

I've drawn and uploaded this schematic on diyitalia.eu, which is an Italian forum (I'm Italian), about a year ago. Never thought I'd publish it in here, that's why there is a "Permission refused blabla" in the pic.
Consider this to be my thanks to this great forum, where I found many detailed and ready-to-go projects.
The SN is: 804116
MXR_M108_VintageBN.jpg


Enjoy :D

p.s. slide pots seems to be 20K linear. I measured'em one by one and the readings showed values from 14KOhm to 22KOhm.
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