I am quite new to electronics but I'm planning to build a device for routing analog audio inputs (cinch) to one output. I want to select one input channel (using a raspberry pi) to forward to the output channel. After a lot of reading about the basics, I found an analog multiplexer (the DG409) that seems to be able to solve this.
My question is, can I just solder the left and right cinch channels to the S1a and S1b (and so on) and wire the grounds together or is there anything else I need to do?
As @pjc50 pointed out, I also need to supply suitable V+ and V- for the device. Looking at the available pins of the raspberry pi, I can find a suitable +5V supply but no -V. The data sheet of the DG409 say that it can be operated in either single or dual supply. To run it with single supply, do I have to connect V- to the GND or leave it unconnected?
And @nick-johnson commented that my signal needs to stay between the positive and negative rails. My signals all come from line-out jacks and should have only minimal current according to wikipedia:
Line outputs are intended to drive a load impedance of 10,000 ohms; with only a few volts, this requires only minimal current.
So that shouldn't be a problem, right?