Switching circuit

[rankine]

I want to build myself an A/B box that can switch between outputs. I want to do this so I can switch between my two amps for different sounds. Can anyone reccomend a simple circuit for this?

[GibsonGM]

A simple A/B box can be used in reverse...instead of "this or that in, to one out", just plug in the other way!  Then you get "one in...this or that out"...make sense?
)

3 jacks, a DPDT switch (or 3PDT for LEDs to show which is active...), and enclosure is all ya need. 

[Mark Hammer]

A "go-here-or-go-there" box can be actually be done, with LED indicator, using a DPDT.  Directing one input to either of two outputs only takes a SPDT, leaving the other set of contacts for LED indicator functioning. 

If you were to build a dual loop selector (i.e., a box that has one in and one out, and selects between one of two send-return loops), using a 3PDT switch, that would be able to double as either a loop selector OR and a/b box.  All you would need to do would be to plug in the guitar and use the choice of send paths as your amp-1/amp-2 outputs.  A little more drilling, and the price of a few more jacks, but a more flexible box, if you ask me.

[rankine]

A "go-here-or-go-there" box can be actually be done, with LED indicator, using a DPDT.  Directing one input to either of two outputs only takes a SPDT, leaving the other set of contacts for LED indicator functioning. 

Could you should me a schematic or layout? I'm newish to effect building.
Thanks for the replies

[CGDARK]

Try this one at:

http://www.fulltone.com/qaframe.html

Click on Build your own Easy, clean  sounding A/B Box   

CG

[soulsonic]

If you're switching the outputs of the amps you need to do more than just switching them :  the unused amp MUST have a load on it's output, and it MUST be muted at it's input. This is more switching than you can really do with a simple footswitch. I have an untested design that uses some relays. I tried it in a simpler way before, but it honestly didn't work well - there was harmful interactions between the amp.... Each amp must have it's own isolated switching circuit - anything else starts causing problems, especially with high-powered amps.