SuperBox Switching?

[mydementia]

Hi guys.
I'm going to do something snazzy with my last 'DD' box and drew up this switching.  Will I have a problem signal bleed through between the A/B and C switches (since they share a switch input lug)?  The idea is to be able to activate the modulation and loop when the distortion (A/B) is off. 


I'm envisioning bonding down a set of headers in the enclosure wired to the power/ground and switches, and using 4-pin connectors on each circuit (for modularity).  I'm not sure why I haven't thought of this before, but I could easily set this up to work for circuit testing too... always the most annoying part of building circuits (for me, anyway) is commiting the time to wire up a switch and jacks (for 'real' on-off testing).  Any ideas on how to minimize the use of 3PDT's?

At the moment, I'm planning a Dr Boogey and Eighteen for my A/B distortions and either another Tremulus Lune (just love the two I've already built) or a Phase90 (on the bench right now) for the modulation... and I'll probably add an output power jack for the loop effects.  Should be a fun little project.
Thanks for looking.
Mike

[mydementia]

I hate to say 'bump' but I'd really like some feedback on this switching idea... I CAD'd up the enclosure and am ready to build my second Dr. Boogie and Eighteen (starting to lean toward MartyMart's G3 instead of the Eighteen for my 'green' channel...but we'll see...). 
Thanks in advance.
Mike

[Pushtone]

It would help with switch identification if you label your switches on the diagram like
SW1a, SW1b, SW1c with the letters referring to the switch poles.

With that logic....
on SW2c the output will get loaded down causing some loss of highs.
And since the A/B circuits inputs are not grounded they may produce
RF noise and isolation when unconnected at SW2a.

Also, you don't need to route the output of SW3c to SW1c. Just take SW3c to the output jack.
SW1c will mute the output when SW1 is in one of its states.
If muting is what you want from SW1 then eliminate the connection between SW1a and SW2c/SW3a and that will take care of the dual connection loading problem at SW2c.

A buffer at the input might be a good idea.
You could use switching jacks and put in two inputs. One buffered and the other unbuffered.

Hope this helps.

[Pushtone]

I think the only way to bypass the dist circuits will be to use five 3PDT switches. I think you will need to add a dist bypass sw.

SW1 = master bypass
SW2 = dist bypass
SW3 = dist select
SW4 = modulation bypass
SW5 = loop bypass

[Pushtone]

OK, I realize that five switches on a DD box doesn't leave room for your Doc Martins
so here are a couple of alternatives.

The first solves the "two outputs to one input" problem
but at the cost of a master bypass.
Uses SW1 as a dist bypass and SW2 as a dist select. No master bypass so
you'll have to tap dance to bypass the whole box.


This one give you a master bypass but there will be some loading at SW3a where both dist outputs feed the mod circuit.
A buffer on the output of both dists would solve that (if they aren't already buffered).
Try this one and see if it works to your satisfaction. If not add buffers

[Pushtone]

forgot to mention the poles for the LEDs have been omited from the drawing.

[mydementia]

Thanks Pushtone - that's the kind of feedback I needed!!
I'm leaning towards adding a fifth switch (DPDT toggle/slider - no need for LED on that one) to bypass the distortion circuits - should allow me to do something similar to your first recommendation...  I don't think bending down and flipping the DPDT will be too bad...maybe I'll use a big toggle so I can kick it with my toe...  or maybe I'll just ditch the loop...
I'll sketch up the wiring with the distortion circuit bypass and post the finished product here for future reference.  ...still not sure which way I'll go...

Thanks again!
Mike

[mydementia]

I think I've decided which way I'm going with this layout...have a look and let me know if you see any problems.  I got rid of the notion of being able to use the Mod and Loop in Bypass mode - now I'm adding an option to bypass the distortion circuits (thanks Pushtone).  I also added a switchable input buffer before the bypass switch - adds the option of being used as a simple buffer box when all effects are bypassed.


I populated the Dr. Boogey board last night and already have the Phase90 built...time to decide which second distortion circuit to add to this beast.

Question:
What are the negative aspects of adding a buffer (unswitchable) to the front end of this circuit arrangement?

Thanks in advance.
Mike

[Pushtone]

Looks better than v1.

Here is some feedback.

The buffer isn't going to do much at the input as the effect/benefit of a buffer ends at the next active circuit.

IMHO there are one of three useful places for a single buffer in this layout.

1. Buffer the Loop output at the send.

2. Buffer the bypass at switch labeled Bypass/On so when the circuits in the box are bypassed the signal is buffered.

3. Two output jacks, one buffered and the other un-buffered by using one switching 1/4" jack. I don't see a need for a foot or toggle switch and using a switching jack could eliminate a switch and free up some realestate on top. With buffered and un-buffered outputs you make your choice by plugging into the one you want.