Parallel Mixing pedal Question.

[jimi23]

I got this idea from watching a John Butler Trio video.
He has 2 pickups, one must go through a distortion pedal somewhere along the line and then both go into this fading pedal.
When the pedal is all the way up, he has a clean signal, and as he pushes his foot down it fades in the distorted signal until it is 100% distorted all the way down.
Im trying to achieve this effect without the 2 pickups, this is what I have so far:



Parallel mixer you might call it.

Will this work? Do I need any other circuitry in there? What type of pot should I use? I know I need dual gang, but what taper and value im not sure.

Thanks in advance for your help, this is the first pedal I am designing from scratch.

[Pushtone]

I'm afraid it's not making much sense to me.

The schematic is simple enough, a "vintage bypass" efx loop.
But it does not match your description.

Where are the two pickup signals?
Where is the pot?


I'm wondering if this Ernie Ball volume/pan pedal would get you there?
http://www.musiciansfriend.com/product/Ernie-Ball-6165-Stereo-VolumePan-Pedal?sku=152102

Good luck
Dave

[R.G.]

Good thinking so far. Morphing setups are a favorite of mine, too.

Circuitry to do what you want is in the article "Panning for Fun" from July 2006 at GEO; see the item "Pan in and Pan out".

[Mark Hammer]

About 25 years ago, I made a panning pedal for a guy in Edmonton (in a band called Wilfred N and the Grown Men, in case anyone remembers them) that used a pair of Anderton's Volume Pedal Retrofit circuits, controlled by a dual-ganged pot that was wired up such that when one went up in volume the other went down (might have also been capable of simultaneous poost/cut but it's so long ago I forget).

That sort of arrangement is a whole heckuva lot more complicated than a simple passive pot arrangement, but then you don't get the doubled risk of scratchiness you inherit with passing your signal through two pots.

[CodeMonk]

I have an idea somewhat similar to this.
What I want to do is guitar signal gets split on my pedal board like so...


D1 and D2 would be some sort of Overdrive, Distortion or Fuzz
F1 would be a Flanger
P2 would be a Phase
Or hell, make F1 and P1 whatever might sound interesting.
Would it be as easy as I've drawn here or is it more complicated. If so, and pointers, links etc on how to do it?

Thanks

[nosamiam]

Wouldn't the Splitter-Blend circuit at runoffgroove.com with an expression pedal in lieu of the blend pot (or the entire circuit built into a rocker pedal enclosure) be the way to go with this?  It's not really 2 pickups is it? Maybe just parallel effects loops, with one loop empty?

[ianmgull]

I'm attempting something similar here:

http://www.diystompboxes.com/smfforum/index.php?topic=67435.0

I'm not sure but it was my understanding that when you split your signal you  need to buffer each "split" so that the differing impedances don't fight for the signal. Somebody correct me if I'm wrong. 

[joegagan]

i did extensive experiments in this realm a few years ago.

i avoid opamps, so the  buff ' n blend , along with rg's circuit were not tried.

using jfet and bipolar buffers and gainstages. the biggest issues i found were:

1. the travel of the pot was a problem, even with dual, triple and four gang circs. to keep from wearing out the pot, travel must be mechanically restricted at the end(s). score a point for opamp circuits.

2. due to the above mentioned issue, bleed from circ A to circ B and vice versa was very apparent when high gain circs were in loop, a major consideration for most most users.

if a user is willing to compromise, ie; bleed  or less than 100% at one, or both ends, the principle will work. i recommmend 1 meg pots in the event that non-buffered levels are in use.