So I had the idea of building a small selector with a rocker switch. Everything would stay plugged in neatly to a small box on my desk, and to switch outputs I simply alternate the rocker switch. Seemed simple enough, so I came up with this.
This all looked great on the screen, seemed logical in my head. Both outputs would have shared left and right channels, and the earth would be switched by a SPDT rocker switch (http://www.jaycar.com.au/productView.asp?ID=SK0991). The logic was that without an earth the inactive output would be exactly that - inactive. Unfortunately this is not how things work in reality, and it resulted in all sorts of unexplainable observations and continuity readings. Basically the rocker switch did not work as desired, and the left channel on both outputs was intermittent to missing altogether. Back to the drawing board.
Further Google Fu-ing revealed someone else that had had the same need for a device like this, and they'd been kind enough to blog about it and post a circuit diagram. Which I shamefully stole and forgot to get the link for crediting (if it's yours, let me know and I shall credit you). It is the same principal, just the opposite - both outputs share their earth, and it is the left and right channels that are switched by the rocker. This meant I needed a DPDT 6 pin switch, which funnily enough Jaycar didn't stock (in rocker form, anyway). Ebay had my back. Basically the unit as before, just twice as many pins.
The circuit I ended up following. Notice how it is basically the total opposite I what I designed.
Testing the assembled circuit BEFORE putting it all into it's enclosure. Foresight! FORESIGHT!
And it worked. As you would expect. Which needless to say I'm pretty fucken happy about. One step closer to total automation/death by physical inactivity.
The bottom of the device, showing all inputs/outputs, and the 6p DPDT switch.
The finished product. Like a boss.
PS: apologies if the formatting in this post looks SUPER shit. For some reason the blogger text editor is being a pain to do simple things today.