Switching XLR with 3PDT

[zpyder]

As some of you may have read, I'm working to put together a box that accepts XLR Low-Z Mic input, and offers Low-Z XLR output, but utilizes a High-Z effect circuit.  I've been able to make this happen using two transformers.

However, I want this to be in a stomp box with a stomp switch, and I can't seem to figure out a wiring schemo to do it using a 3PDT - may be impossible.  I've been scratching my head, getting close, but no cigar.  May not even be feasible, but I figured I'd toss it out there to see what ideas others might have.

Basically a true-bypass for XLR.  In all cases, pin 3 of both XLR jacks goes to ground.  In the bypass state, input pin 2 must be conneced directly to output pin 2, and in pin3 to out pin3.  In the engaged state; in pin 2, in pin 3, out pin 2, and out pin 3 all go to seperate destinations.  As far as I can tell this isn't a possibility with a 3PDT, but who knows?

I am aware of active 4053-style switching, but would rather avoid it if possible.

Any ideas out there?

thanks,
zpyder

[birt]

i would use a dpdt (one side for a led) and a relay switch. or if it doensn't need to be foot operated use a rotary switch of an old printer A/B switch box.

[zpyder]

hmm, I hadn't thought of a relay.  Never used them before.  Too many options at mouser to figure it out.  I guess I'd need a 4PDT relay???

[birt]

or 2 dpdt's

[Processaurus]

Have you tried leaving the input connected, and switching the outputs?  True bypass is a habit that in reality is probably soley desirable so magnetic guitar pickups don't get loaded down and lose treble.  Do dynamic mics have the same problem, especially with what is probably a modern effect with a high input impedance? 

Electronic switching has an upside (its not that hard to do, either) because you can avoid the inevitable click/pop from a mechanical switch for bypass.  An audio specific relay may be less prone to clicking, alternately.

Great idea by the way, I was talking to the singer for a band called two ton boa recently who was getting the exact same thing like that custom built for delayed out chorus parts,  basically a direct box sandwich so you can use any pedal on vocals (and be able switch it out if you want later) without a table full of stuff to set up.  I can't believe something like this doesn't exist, a vocalist pedal adaptor...