Help in designing an input selector switch
I originally posted in another thread - however I think my question really has more to do with the specific details of creating an input selector switch - any help or advice would be appreciated.
I have the following set up:
Eclipse 54400 head unit - no aux input.
Eclipse Model 3640 4/3/2 Channel Power Amplifier
Dell MP3 player
I, like many others in this forum, would like to patch my mp3 player into the sound system. After contacting my local Eclipse dealer, they confirmed that there is no aux input on this older head unit, nor does it support a CD changer. They mentioned RF modulators or doing something custom. I've heard output from RF modulators and they really do, in my opinion, compromise the sound. Having the dealer do anything custom would be cost prohibitive - at that point I might as well purchase a new HU that has an aux in.
I'd like to keep the Eclipse HU, and don't really need to have a "full" integration of the mp3 player - just the ability to plug it in to the system. I can happily control the volume and song selection from the mp3 player itself.
I thought that since I have the external amplifier, I could either buy or build an input selector switch that would allow me to toggle between the head unit and the MP3 player.
I've attached a diagram of what I think I need.
I've seen some existing switches/selectors available, but almost all are designed for video - red, white and yellow RCA - with only two audio inputs per position, and only two audio outs.
The head unit has four RCA outputs, the amp has four RCA inputs. The MP3 player has a single headphone (mini 1/8") out with which I can use an RCA Y adapter to get two RCA outs.
It seems, that to build something, I would need a small box with four inputs for the head unit, and two inputs for the MP3 player, and then four outputs to the amp - with a switch to select which input source to direct to the amp.
Can someone help provide a novice with information about the appropriate parts and the wiring info I would need to build such a thing? While I don't have any real experience with this sort of project, it seems like it should be simple enough with some basic parts (a box, RCA jacks, a switch) and a soldering iron.
Ideally, I could run a wire from the box to a switch that I put into an open slot in my dashboard.
Or if this set-up is available for purchase somewhere (again, I can't seem to find much other than video switches) I'd appreciate a tip.
OR let me know if there is any reason this is not an appropriate way to do this.
Thanks very much.