Anything similar to this DIY eqd tone job pedal

[LaceSensor]

Hi

This looks interesting, anyone know the circuit or workalike?

http://elevationboutiques.blogspot.co.uk/2012/06/eqdtonejob.html


Thanks

[micromegas]

Raulduke's Tonemeister was a similar concept: 3 band eq (Baxandall topology, wich I find better than a pasive configuration) and active volume (with 11dB boost if I remember right).

I don't know if he is going to do more pcbs, but you can find the schematic in the build instructions that he kindly posted in the forum.

EDIT: and Raulduke's circuit runs at 18v vía charge-pump !

[kothoma]

Raulduke's Tonemeister was a similar concept: 3 band eq (Baxandall topology, wich I find better than a pasive configuration) and active volume (with 11dB boost if I remember right).

I don't know if he is going to do more pcbs, but you can find the schematic in the build instructions that he kindly posted in the forum.

EDIT: and Raulduke's circuit runs at 18v vía charge-pump !

See here: http://www.madbeanpedals.com/forum/index.php?topic=6905.0 (SJEffects_Tonmeister_BuildGuide.zip)

[LaceSensor]

thanks guys

Interesting!

[raulduke]

Replied to your PM Ian 

The tonmeister is very usefull, and is operationally similar to the EQD (I've no idea whats 'inside the box' with the EQD though).

I am also working on the V2 of the Tonmeister, which will feature adjustable mid frequency (makes it a lot more usefull IMO).

I'll keep you guys updated.

[micromegas]

Replied to your PM Ian 

The tonmeister is very usefull, and is operationally similar to the EQD (I've no idea whats 'inside the box' with the EQD though).

I am also working on the V2 of the Tonmeister, which will feature adjustable mid frequency (makes it a lot more usefull IMO).

I'll keep you guys updated.

Man, this sounds terrific, I lost the chance of getting one frome the first bach and I was thinking about puting it together myself, but if you're going to release another version count me in for it!!

[raulduke]

Cool; glad you like the sound of it!

I have the proto PCB's in my workshop. Just need to build the buggars up and check everything is hunky dory!

[kothoma]

Hey, that new version sounds interesting, would like to hear more about it. Has it parametric mids with a SVF?

[raulduke]

The mid band is not fully parametric (ie. you cannot change the Q). It is a version of the Wien middle band circuit.

The circuit uses a TC/MAX1044 bipolar supply to get +9 and -9V for the headroom and boost/cut range required.

The signal path goes INPUT ->Input Buffer -> Mid Band EQ -> Baxandall Treble+Bass EQ -> Output Preamp -> OUTPUT

All the stages are Opamp based (no transistors).

I have a few other builds to complete but it shouldn't be long till I have it going!

[kothoma]

OK, I see. Thanks for the info!

[kothoma]

Has anyone tried to build this, maybe even made a board layout?
It has treble, bass, and parametric mids with variable bandwidth using a state variable filter.
http://hem1.passagen.se/robin2/im/giteq.gif
http://hem1.passagen.se/robin2/txt/giteq.txt
(http://hem1.passagen.se/robin2/effects.htm)

[raulduke]

I had a look into variable Q eq circuits, but I don't really think they are as usefull for guitar/bass purposes as they are in mixing/recording scenarios. A wide/mid Q value is usually more 'musical' sounding for most guitar tone applications.

Also, these circuits (including the one above) usually require stereo/dual potentiometers that need to have a low tolerance to ensure optimal operation.

[kothoma]

Interesting, so your Wien bridge bandpass filter doesn't need a dual pot for the frequency?

I think you're right about Q for regular mids (say around 700Hz)  but for high mids (say above 1200Hz) I find a more narrow bandwith usually better.

But I never found the tolerance of the dual gang frequency pot on a SVF really critical.

[raulduke]

Interesting, so your Wien bridge bandpass filter doesn't need a dual pot for the frequency?

I think you're right about Q for regular mids (say around 700Hz)  but for high mids (say above 1200Hz) I find a more narrow bandwith usually better.

But I never found the tolerance of the dual gang frequency pot on a SVF really critical.

No it uses a single gang pot which makes things much easier.

The Q changes slightly (gets narrower) as you increase boost/cut, but this behaviour also occurs in some of the old school EQ's and sounds 'musical' for want of a better word.

[kothoma]

No it uses a single gang pot which makes things much easier.

Yeah, that's nice.

The Q changes slightly (gets narrower) as you increase boost/cut, but this behaviour also occurs in some of the old school EQ's and sounds 'musical' for want of a better word.

That's nice, too.

BTW I just remember, the Nathan East eq has switchable Q. I think it's mostly for notches.