A/B/A+B Switch

[Ivory Knight]

Hi guys,
i need a schematic for that kind of switch!
pls one without relays!

what i want to do:

Channel A:  Multi FX stompbox
Channel B:  Stompboxes (wha, distortion, etc.)
Channel A+B: Multi FX + Stombox

Best regards,
markus 

[Seljer]

Do you want this to go to 2 different signal paths (stompboxes to one amp, multieffect to somewhere else) or both into the same amp (like 2 selectable effect loops, and when you'd have both selected you'd be running the effects in parallel)?


If its the second that you to do want I just drew this up (which should hopefully work). Its based mainly off the Splitter-Blend from Runoffgroove http://runoffgroove.com/splitter-blend.html but with switching to mute either of the channels, only without the "blend" part (you can add that in if you want to, or just control the volume levels of each effect loop) and without the phase switch (weirdness my occur if the 2 signals are out of phase when you run both of the loops, you can also add that in if you want to).




or do you want to run the 2 different loops in series when you have both of them selected?

[QSQCaito]

Isn't this A/B/Y box??


i would highly recommend to read R.G.'s Website

And use the Search Function to find more about what you're looking for!


Bye bye!

Hope it helps

DAC

[Gilles C]

It's not a A/B/Y that connects 1 output to 2 inputs (in parallel) or vice-versa, it's a A/B/A+B which connects 2 effects in series.

More like this http://www.geofex.com/Article_Folders/juggler/juggler.htm

Gilles

[Gilles C]

I made a drawing that would use a 3PDT and a DPDT to do that.

I checked the connections on paper and it looks good. But I still need to identify everything. It is more a drawing than a schematic, but it will be enough to start you.

I'll be back.

Gilles

[Gilles C]

Ok, here's my take on this.

http://www.gtechblues.com/images/AB-A&B_SwitchBox.pdf

The 4 drawings show the 4 possibilities where the Footswitches can be.

Footswitch 1 is "A&B"
Footswitch 2 is "A/B"

When the "A&B" switch is in the Normal position (Off), you can select Effect A or B with the "A/B" Footswitch, and when the "A&B" Footswitch is in the A&B position (On), it will connect the input to effect A and the output of "Effect A" to the input of "Effect B" which will finally connect to the output, no matter how is the "A/B" Footswitch.

I hope that this is what you want to do.

But please note that the input of the unused effect(s) is not connected to ground and is floating. I don't know if it can cause noise problems. Any opinion on that?

Gilles

[calpolyengineer]

Using Gilles flowchart thing, I made up a little drawing of the bottom of the switches with everything color-coded. I found the chart to be a little hard to follow, so I hope this averts some confusion. Also make sure to correct me if there are any mistakes. http://my.opera.com/bigstickmuffin/albums/show.dml?id=114729

-Joe

[Gilles C]

I'm not sure everything is correct Joe. You swapped the A and B effect names in your drawing, and changed 2 switch positions (Sw1b and Sw1c) from my original drawing. I changed them too in my second version of the drawing in color. Humm... I think there are a few mistakes, like when you connected the top and bottom lugs of sw2 together???

Here is the version I made tonight. I tried to make things easier to follow.



I also added the same colors to the drawing showing the 4 possibilities. When you flip the page of the pdf file, you can see the switches positions change (if you are displaying the full drawing on your screen).

http://www.gtechblues.com/My_Layouts/AB-A&B_SwitchBox.pdf

Gilles

[calpolyengineer]

Ahh yes! I put that together in kind of a rush, didn't even occur to me to have send and return for the effects I just grouped them together as one line (how ingenious of me ), hence the connections on sw2. I'll remove that picture as yours is not only much nicer looking, but correct as well.

-Joe

[Gilles C]

It's not a A/B/Y that connects 1 output to 2 inputs (in parallel) or vice-versa, it's a A/B/A+B which connects 2 effects in series.

More like this http://www.geofex.com/Article_Folders/juggler/juggler.htm

Gilles

Just wanted to correct myself...

I meant to write: "If it's not an A/B/Y that connects 1 output to 2 inputs (in parallel) or vice-versa that you want, it's an A/B/A+B which connects 2 effects in series."

Not the same, and not what I meant to write the first time...

Also

Ahh yes! I put that together in kind of a rush, didn't even occur to me to have send and return for the effects I just grouped them together as one line (how ingenious of me ), hence the connections on sw2. I'll remove that picture as yours is not only much nicer looking, but correct as well.

-Joe

Just make sure that you have the latest drawing and pdf file that I uploaded, because I already made a mistake myself by inverting the contacts of "SW1c" the first time.

Ok, I won't hijack the thread anymore. That should conclude it...

Gilles

[Seljer]

Its more of an A/B/A->B type thing

[Gilles C]

You're right. I was also wondering about "A2B" or "A/B Looper"

Anyway, the files has been modified. I wanted to change a few things anyway, so...

http://www.gtechblues.com/My_Layouts/AB-A2B_SwitchBox_Wiring.jpg

http://www.gtechblues.com/My_Layouts/AB-A2B_SwitchBox.pdf

I wonder about what Markus really wanted???

Gilles

[Red Phoenix]

hi guys,
i draw a picture of what ivory and me want to build.


i want to change every chanal with only ONE step.
and i want ic's instead of relays, because i dont want some noise while changing the chanal.

-if chanal a is activ. but i want chanal b. press b.
-if chanal a is activ. but i want true bypass. press a.
-if chanal b is activ. but i want chanal a. press a.
-if chanal b is activ. but i want true bypass. press b.
-if chanal a is activ. but i want chanal a+b. press a+b.
-if chanal b is activ. but i want chanal a+b. press a+b.
-if chanal a+b is activ. but i want true bypass. press a+b.
-if chanal a+b is activ. but i want chanal b. presh b.
-if chanal a+b is activ. but i want chanal a. presh a.

i know...i don't speak english very well.... i'm german

i hope you can help.

[Seljer]

You're going to need to get into relays and/or electronic switching systems (which aren't mechanical the full mechanical true bypass if that bothers you) to do something like that.

The most simple way of doing it would to be just to wire 2 true bypass switcges for each loop, a bit more of pedalboard dancing but its simple.


I'll try to think something up.

[Red Phoenix]

i don't want to dance

is it so long winded to build a switch like i want?

[Seljer]

Well it should be possible.


Would you mind much if there was a 4th switch to bypass everything? since I can't figure out how to do that right now

[Red Phoenix]

i don't have a problem with a 4th switch to bypass all chanals......
when it works like this i'm pleased with that.

switch-A    switch-B    switch-A+B    switch-TB

-if chanal a is activ. i want tb. press tb
-if chanal b is activ. i want tb. press tb
-if chanal a+b is activ. i want tb. press tb
-if tb is activ. i want a. press a
and so on

it were great if you could draw a wiring diagram for such a loopswitch

[Seljer]

Let me just test it first 

[Seljer]

Well here is what I came up with, it seemed to work in my quick basic test of it:




This is just the part that generates the control signals, which are then run into some sort of electronic switch like http://geofex.com/Article_Folders/cd4053/cd4053.htm or use it to open/close relays (well a transitors that open/close a relays since this on its own does not have enough power, batteries would also not work with relays so you'd have to run the thing off a +12V from a power supply).
There a bunch of various articles on bypass stuff on http://geofex.com/

[Red Phoenix]

*thumb up*
don't beat me...but....i understand nothing
and i think that i can't piece together your wiring diagram with the other on that site.
If you have a little piece of time...please....complete the wiring diagram for me....i'm a real newbie.