How to add a mids knob to a baxendall 2 knob tonestack?

[frequencycentral]

Any ideas?

[theehman]

 

[frequencycentral]

Ok I found this:

About the Baxandall - if you increase C3 (from Duncan's Tone Stack calculator), you can get a huge mid-range boost (that extends down to enhance low-range frequencies) .  I always add a cap in parallel with C3, and put it on a switch.

Thanks Walt! Looks like 2nF (though Walt suggests 890pF) might be a good choice. Maybe a mix pot would work between the 330pF and a 2nF to have variable mid boost?

[karter2000]

Ok I found this:

About the Baxandall - if you increase C3 (from Duncan's Tone Stack calculator), you can get a huge mid-range boost (that extends down to enhance low-range frequencies) .  I always add a cap in parallel with C3, and put it on a switch.

Thanks Walt! Looks like 2nF (though Walt suggests 890pF) might be a good choice. Maybe a mix pot would work between the 330pF and a 2nF to have variable mid boost?

Cool, I'll have to try that.

Is it possible to mimic the inductor-driven midrange control like the SVT?  Would that work in the average stompbox circuit?

[frequencycentral]

Maybe a mix pot would work between the 330pF and a 2nF to have variable mid boost?

Kinda like this?

[Derringer]

Ok I found this:

About the Baxandall - if you increase C3 (from Duncan's Tone Stack calculator), you can get a huge mid-range boost (that extends down to enhance low-range frequencies) .  I always add a cap in parallel with C3, and put it on a switch.

Thanks Walt! Looks like 2nF (though Walt suggests 890pF) might be a good choice. Maybe a mix pot would work between the 330pF and a 2nF to have variable mid boost?

Cool, I'll have to try that.

Is it possible to mimic the inductor-driven midrange control like the SVT?  Would that work in the average stompbox circuit?

I think you'd have to build a gyrator/parametric-EQ with an opamp to simulate what's going on in the SVT design ... unless you could find the right inductors

[AdamM]

there used to be a nat semi opamp application note which included a three band bax tone control. might be worth a search on www.national.com

or try googling "3 band baxandall schematic"

[merlinb]

If you vary the 180k 'pot separation resistor' you get a shift control that moves the whole response up or down. Not exactly what you want, but useful nonetheless.

[CynicalMan]

Can't vouch for it personally, but you could try this:

[askwho69]

how about the active one? which component to increase to add mids ?

[caspercody]

Here is one from a Carvin amp.

[caspercody]

That did not work, will this:

http://www.4shared.com/photo/qRxMF3gT/baxandall_-_tonestackwith_mid.html

[CynicalMan]

Here is one from a Carvin amp.

Right-click and press Copy Image Location. Use that as the image link.

[aziltz]

Maybe a mix pot would work between the 330pF and a 2nF to have variable mid boost?

Kinda like this?

I would suggest shorting the middle lug to the upper lug on the Mid Pot, otherwise you might get Mids on both ends and not much in the middle.