MXR Equalizer Schematics

[IvIark]

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

MXR 6-band EQ:


MXR 10-band EQ:


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

[RnFR]

thanks george!

[fosnal1950]

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.

Alf

[Dirk_Hendrik]

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...)

[fosnal1950]

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 .

Alf

[fosnal1950]

Here you go : the site where I discovered it .

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


Alf

[lolbou]

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...

[nzino]

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

Thanks.

[mecmast]

any layout/pcbs plz?

[Rocket Roll]

MXR 10-band EQ master volume mod:

[shotgunn]

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

[mcraveri]

Hallo,
Does anyone have a layout with tracks?

Tanks

[Lonkero]

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

[HTH]

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

noise specs?

[O.B.Y]

does it verified?

[Dirk_Hendrik]

No.
factory schems never do it verified.

[O.B.Y]

No.
factory schems never do it verified.

so... have you built it?

[Dirk_Hendrik]

Nope. I undid unverified it! Much less harder funstuff

[O.B.Y]

Nope. I undid unverified it! Much less harder funstuff

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

so can u give me for the solution??

[Fix_Metal]

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

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