BurntFingers
Well-known member
Yeah good call. I might have a play around. Add a level control and it's a ge7 that doesn't suck.
6-band EQ
- Thread starter Robert
- Start date
dlazzarini
Well-known member
I’d rather stick with 6. I’ll admit defeat. I’m perfectly happy with that
BurntFingers
Well-known member
Just wondering is this the same as the mxr 6 band?
Robert
Reverse Engineer
It's based on the older blue MXR 6-band EQ.
BurntFingers
Well-known member
Gotcha thanks. Presumably the 10 band is the same but with a few more stages.
Mike McLane
Active member
Tom Bukovac had some outfit re-engineer the Boss GE-7 to concentrate the EQ bands in the mid range. . . .
www.xacttone.com
. A mod that subs parts to accomplish the same things (like the different "flavors" for the Ice Scream) would be very cool.
XTS Midrange Graphic Modded GE-7
The XTS Midrange Graphic Mod was developed with Tom Bukovac. The session ace wanted an eq pedal centered entirely on the guitar's midrange frequencies. To that end, we take a full-range Boss GE-7 graphic eq and modify the frequency bands to focus on critical midrange frequencies. With the...
www.xacttone.com
Robert
Reverse Engineer
Robert
Reverse Engineer
Mike McLane
Active member
If you did the "mid-range thing" could it be possible to leave one band for an overall volume slider (like the GE-7) or would that require a completely different schematic/PCB? I was thinking in terms of a booster that could kick in to hit your drive pedals with some additional volume and mid-range for solos.
yazooligan
Active member
Awesome! The EQD Tone Job is my favorite EQ/sweetener, and I’m just not into faders for my pedals, so this is definitely one for me!
Robert
Reverse Engineer
I want to try this one too. =)
So if the first five bands are Sallen-Key Hi Pass Filters the parts values would change to:
But how is the frequency determined in the last band???
| 400Hz | |
| C5 | 68n |
| C6 | 220n |
| R11 | 22k |
| 800Hz | |
| C7 | 33n |
| C8 | 120n |
| R13 | 22k |
| 1.6KHz | |
| C9 | 15n |
| C10 | 68n |
| R15 | 20k |
| 2.0KHz | |
| C11 | 12n |
| C12 | 56n |
| R17 | 24k |
| 2.5KHz | |
| C13 | 10n |
| C14 | 39n |
| R19 | 22k |
| 4.0KHz | |
| C16 | 47n |
| R20 | 820r |
But how is the frequency determined in the last band???
Last edited:
daeg
Well-known member
Yeah, if you look at the MXR 6-Band EQ schematic, it's not a gyrator. It's just a LPF placed across the differential amplifier.
Thanks for figuring out the bands. I really do like the idea of a mid-focused EQ and the 6-band might be the right platform for it.
Robert
Reverse Engineer
It might be useful to keep them separate so you could stagger the two EQs differently on each side.
Was a bit of a bugger trying to get the two boards apart and then remove a bunch of the caps and resistors but I've changed it all over to the XTS frequencies using the values I posted above and it sounds really nice. I'm looking forward to getting this on my live rig but am not playing for another couple of weeks.
