Switching help please!

[GP]

Hi all,

This is my first post so firstly I'd like to say hello to everyone.

Secondly I was wondering if some kind soul could assist me with my current dilemma. I'm not sure if this is possible but something makes me think that it's actually easier to solve than my thought processes are making it 

I currently have a board incorporating a couple of effects which i will use a dpdt toggle to choose whether effect 1 goes into effect 2 or i just have effect 1. This is obviously fairly easy to achieve.

What I thought may be interesting is to somehow insert a momentary switch (I have a dpdt momentary footswitch handy) into the system somewhere that would allow me to momentarily reverse the setting of the existing dpdt, i.e so that if the dpdt is switched to route through effect 2, pressing the momentary switch would bypass effect 2 for as long as it's held down. Conversely, if the dpdt is set to bypass effect 2, pressing the momentary switch would send the signal through effect 2.

I've sat here for a couple of hours or so and every time I think I've solved the conundrum, i realise that in fact I haven't.

Can anyone help?

Thanks in advance and best wishes to all.

[lotsolowend]

i'm very new to this as well but i think i know a way you can do it with 2 momentary switches, let me see what i come up with

[GP]

 hi lotsolowend,

Thanks for trying to help me. i don't want to sound ungrateful but i only have one momentary footswitch handy and one of the effects will be controlled via an expression pedal so it will be hard enough to switch one momentary with my other foot on the pedal. With two momentaries i would either need a friend to help or grow a third leg!

Like I say, I don't want to sound ungrateful but equally i don't want you to spend time on my account when a solution with two momentaries won't be a useful solution.

[lotsolowend]

yeah, and i missed where you said dpdt momentary

i need to check how DPDT is wired for momentary b/c ive never used one but i think you could put the output of effect 1 on 1 lug and the other lug in the same pole could be send to effect 2 then for the 2nd pole output effect 1 and overall output

i think that might work to bypass effect 2 if it's a "normally closed" switch.  if it's normally open i'll have to rethink

anywho i'm off to my girlfriend's aunt's house for thanksgiving dessert so i'll have to check back tonight, good luck

[sean k]

Without knowing how you've wired up the stomp action DPDT it's kinda hard to figure out what one might do but I would guess that on one hand you have part of the switch in parallel, to change the settings back to what they were while also having the ability to undo anything that needs to be undone... like earthed inputs.

[GP]

Hi sean,

I'm sorry but i'm not following you. It may well be that I have confused you with my first message so please bear with me...
So far I haven't wired up anything. This was a question about how to wire something up, not to review what i have already done.

the system as I envisage it would be as below:

IN >--- Effect A  >---- Effect B ----> OUT

I intend for Effect A to always be "on". I wanted to place a switching setup between Effect A and B so that I can:

(1) Have Effect A pass through Effect B unless I press a momentary switch, whereupon Effect B would be bypassed
(2) Have Effect A bypass Effect B unless I press a momentary switch whereupon Effect A would go through Effect B

I would like to switch between option 1 and 2 in some way. This may or not be possible without jumping thorugh hoops so I am prepared to be told it's too difficult to implement.

[slacker]

I can think how to do it so long as you don't need it to be "true bypass" but I don't think you can do it "true bypass" if you want to only use DPDT switches, there's too many poles that need switching.

[GP]

I was intending to route IN and OUT (in my prevoius pseudo-schematic) through a further DPDT as the overall stompbox bypass system. Maybe this doesn't assist matters or maybe it does. As I say, I'm a bit lost as to whether this is possible or not hence the original question

[lotsolowend]

just out of curiosity, why dont you just consider the output of effect 1 the input to this box.  that would make it a bit easier unless effect 1 isnt TB and that's why you're putting it in this looper (i'm guessing you're making a tb looper)

rather than in - > effect 1 - > effect 2 - > out
go
in (which is out of effect 1) -> send - > return - > out

then you have 1 TB loop and your momentary might be easier to wire up, but like i said before i'm pretty new to this and don't even have experience with that switch

[GP]

Thanks for your idea lotsalowend. In my mind these effects are already separate effects - they just happen to be sharing the same enclosure and piece of stripboard.

Just to clarify the reason for posting this question in the first place:

Currently I am giving my (particularly dreadful) Morley wah pedal a new lease of life. It's been a back-of-my-mind project for a few years and i've finally found some spare time to do it. I'm not intending to build a new wah pedal but one of my two effects will use the rocker pedal and I'm obviously making use of the LED/LDR combination for this.

I also happen to have a DPDT momentary footswitch which I mistakenly bought a year or so ago. I picked up a few footswitches off the shelf at Maplin and within the three or four latching switches was hiding a momentary switch. Obviously I should have checked before paying for them and driving home again but, in fact, i didn't notice till some days later when I'd already wired the thing up in a pedal and was wondering why this particular footswitch wasn't working properly. Of course, once soldered, there's no point trying to take it back to the shop so I've had it sitting in a draw since then.

Now that I find myself with a spare moment, I wanted to turn my (hitherto useless) Morley wah pedal into something more useful and, as many of you will appreciate, there is a substantial amount of space inside a Morley enclosure. Thus I thought I'd build a couple of effects into the same enclosure and allow myself the ability to have one or both effects used at the same time.

Then it occured to me that there may now be a use for my (hitherto useless) DPDT momentary footswitch.

So, really just an attempt to try and turn some things I had no use for into something I do have a use for. I haven't actually wired anything up except for building a board so I haven't "hard-coded" any particular choice of switch into the system. My only desire would be to use this DPDT momentary switch so if anyone can up with a simple way i can achieve my original aim then i would be very appreciative. Otherwise, it's no big deal...

Thanks for all assistance so far.