Go Back   UG Community @ Ultimate-Guitar.Com > Instruments > Gear Building & Customizing
User Name  
Password
Search:

Reply
Old 10-25-2012, 08:27 PM   #1
unet
rah - sick
 
unet's Avatar
 
Join Date: Oct 2008
Location: Los Angeles
MXR Blue Box mods

<blue box build : mods thread!>
So I want to mod the MXR blue box to :

1. have an octave on/off toggle switch. ie. use it as a regular fuzz and be able to switch the octave in/out.
Quote:
Originally Posted by seljer
the "Blend" control already allows that. All the way counterclockwise its just fuzz, no octave. If you want to add a switch to do it, make the switch disconnect pin 1 of the blend potentiometer.


2. not have a volume drop
option 1. Clip the c11 capacitor (the one connected in parallel with the blend pot). This is c9 on the tonepad layout. Warning : This changes the tone of the blue box quite a bit, so try it before you permanently clip it!

option 2. Add a booster circuit after the blue box to increase it's output. (SHO, LPB etc are fairly small and simple circuits)

3. be able to have either one octave down or two octaves down
Connect a switch between pins 1 and 13 of the flip flip



4. have a "fuzz" control
----



Other reported mods :
100K Linear pot in place of the 50K blend makes it sound "deeper and doomier"


Vero layout : http://www.sabrotone.com/wp-content.../09/BlueBox.gif

Schematic : http://www.tonepad.com/getFile.asp?id=73


Can you guys think up any more mods we can add to this?
Also, if you have any solutions to the unanswered mod questions or any mistakes/improvements to make for the ones I've put up, please post them here and I'll add them to the OP.
__________________
New Album Out Now!

Last edited by unet : 10-28-2012 at 12:14 AM.
unet is offline   Reply With Quote
Old 10-26-2012, 01:42 PM   #2
Sid McCall
(Actually, I'm Scott)
 
Sid McCall's Avatar
 
Join Date: Jul 2006
Location: Nashville, TN
I'm sorry I can't help, but I am incredibly curious how to pull this off. I'm sticking the thread and hoping for some answers!

There's a great blog, tagboardeffects dot blogspot dot com, and the guy |v|ark might be able to help you out. He's really sharp and really quick to respond to questions.
__________________
Telecaster - SG - Jaguar
Princeton Reverb, Extra Reverb
P-Bass - Mustang Bass
Apogee Duet 2 - Ableton Suite
Sid McCall is offline   Reply With Quote
Old 10-26-2012, 02:09 PM   #3
seljer
UG Resident
 
seljer's Avatar
 
Join Date: Apr 2005
Location: Slovenija
Err, the "Blend" control already allows that. All the way counterclockwise its just fuzz, no octave. If you want to add a switch to do it, make the switch disconnect pin 1 of the blend potentiometer.
seljer is offline   Reply With Quote
Old 10-27-2012, 12:55 PM   #4
Sid McCall
(Actually, I'm Scott)
 
Sid McCall's Avatar
 
Join Date: Jul 2006
Location: Nashville, TN
Quote:
Originally Posted by seljer
Err, the "Blend" control already allows that. All the way counterclockwise its just fuzz, no octave. If you want to add a switch to do it, make the switch disconnect pin 1 of the blend potentiometer.

From what I can tell, the blend is just for the second octave, not the first one. Haven't used mine in a while, so I could be wrong...
__________________
Telecaster - SG - Jaguar
Princeton Reverb, Extra Reverb
P-Bass - Mustang Bass
Apogee Duet 2 - Ableton Suite
Sid McCall is offline   Reply With Quote
Old 10-27-2012, 03:54 PM   #5
seljer
UG Resident
 
seljer's Avatar
 
Join Date: Apr 2005
Location: Slovenija
Quote:
Originally Posted by Sid McCall
From what I can tell, the blend is just for the second octave, not the first one. Haven't used mine in a while, so I could be wrong...


By default, it only does two octaves down. You need to add a switch to bypass the second part of the flipflop if you want one octave down.

I've built the tonepad circuit and it works like so (I added the 1/2 octave switch and I I shoved in a little booster circuitboard after the effect to fix the volume drop issue)
seljer is offline   Reply With Quote
Old 10-27-2012, 06:15 PM   #6
end_citizen
New bird. Flightless
 
end_citizen's Avatar
 
Join Date: May 2006
Location: Oklahoma
Seljer is right. It is a double octave down by default. You use the blend to mix the original signal (although fuzzy) with the double octave. A switch can be added to make it single octave down.
__________________
Back in action, now with brain and spine cyst.

Learn the gist of tube amps
end_citizen is offline   Reply With Quote
Old 10-27-2012, 10:38 PM   #7
unet
rah - sick
 
unet's Avatar
 
Join Date: Oct 2008
Location: Los Angeles
Great! I updated the OP.

Anyone know where to add a fuzz knob? Or if that's possible?
__________________
New Album Out Now!
unet is offline   Reply With Quote
Reply


Thread Tools Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -4. The time now is 11:19 PM.

Forum Archives / About / Terms of Use / Advertise / Contact / Ultimate-Guitar.Com © 2014
Powered by: vBulletin Version 3.0.9
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.