sweep for midrange

[duclon]

I've been building some tone stacks, passive and active for a couple boxes i have.

question: does anyone have a tone stack or part of a tone stack schematic that has a sweep or adjustable frequency for one on the frequency's. i want to make my midrange tone pot frequency variable with another pot.

thanks
Mike

[Adventure_Audio]

Ive been trying to find something like this for a while and cannot seem to figure it out. Best bet is to rock an active EQ to sweep a controlled section of the mids

[blackieNYC]

http://geofex.com
The simple parametric Eq. I just built a single midrange band.  It's great.  Fixed-wah boost sound or a very narrow Q notch.  Adjust Q, freq, and gain.   See the sabrotone version of it as well.

[mth5044]

^+1

[merlinb]

Brdiged differentiator?
http://books.google.co.uk/books?id=9kMDBAAAQBAJ&lpg=PP1&dq=merlin%20blencowe&pg=PA200#v=onepage&q&f=false

Or use a regular TMB tone stack but add a variable resistor in series with the slope resistor.

[Processaurus]

I've had a back burner project for a while to make a little PCB of the Metal Zone EQ section to add parametric mids to fuzzes, etc:




The parametric mid control (note the weird pots, both are dual gang, one is "C" taper, one is "G" taper ()) begins at C011 and ends at C005.

[R.G.]

State variable as a bandpass, providing boost/cut by providing the feedback around an opamp. You get one knob (albeit a dual pot) control of frequency, one knob control of Q, and one knob control of boost/cut. It's what's used in many early studio parametrics.

[mth5044]

The parametric mid control (note the weird pots, both are dual gang, one is "C" taper, one is "G" taper ()) begins at C011 and ends at C005.

From what I understand, G taper is used in some EQ situations. According to Rob Strand:

"The G taper is a symetrical taper with 50% resistance at 50% rotation, ~10% resistance at 30% rotation and ~90% resistance at 70% rotation. "