Interactive Bass and Treble Pot on a Standard Push Pull

[frets]

Hi Guys!!😸😸😸

In keeping with my current vibe for bass and treble, this tone pot combines both interactively on a standard push pull.

[stevewf]

I take all frets's drawings like this to learn how they work, sometimes making hasty schematics to help me do so. So, thanks for another!

I'll bet that company PMT uses similar circuitry in their Dual Mode Tone control. It's a pot that uses a push-pull to chose between what they call "low-pass and high pass modes". They added a PC board that allowed them to include option switches.

Which reminds me of the Treb-Leed, because it has a PC whose compactness allows for extra options.

[jb1984]

Hi frets!  Thanks for posting this treble/bass cut circuit.

Would you mind clarifying that the intention is for the interactivity to be regarding having either a treble cut OR a bass cut based on the switch position, but not for the treble and bass cuts to be interactive together?

I'd love to be able to get a PTB-style tone control using a single pot, but from the digging around I've done on various posts, I think that'd require some kind of DPDT pot with separately controlled ganges, yet not concentric, which I don't believe exists.

Something like...

• Pot in "down" position - treble cut mode (standard tone control).  Rotate to around 7 for a slight treble reduction,
  
• Pull up on the pot - bass cut mode. Rotate the knob to 10 and then back to 7 for a slight bass cut.
• Expectation: the signal now has a bandpass filter effect, dampening both the upper and lower frequencies.

I was hoping that's what this was intending to illustrate, but it seems like it's an either/or type of situation.  Wanted to check.  If not, am I correct that this would require some kind of potentiometer that would need to be custom made?

Either way, still a useful alternative to a TBX-type detente control!

[newey]

jb1984-

Hello and Welcome to G-Nutz2!

it seems like it's an either/or type of situation.

Yes. It's a single-gang pot so one can only control one thing at a time.

I think that'd require some kind of DPDT pot with separately controlled ganges, yet not concentric, which I don't believe exists.

There are dual-gang pots with a DPDT push/pull switch, but this again (if not concentric) would only control one gang at a time, because both are on the same shaft. A concentric dual-gang with a push/pull would do the trick but I don't think I've ever seen one (which doesn't mean they don't exist, but expect quite a search if they do).

[jb1984]

Thanks, newey!  Appreciate the response and clarification.

[frets]

On second thought, I should not have called this “interactive” as it controls one band at a time (on the push pull).