[DeathToWindows]

Ok, figuring that there might be someone here with more knowledge than me, here goes:

I need to take a line-out signal (audio from a computer/cd player/iPod/etc) and be able to direct it to one of sixteen output lines. Only one line would ever come on at a time, but the control will need to come from a computer. I've done exactly this with a Phillips DeMUX IC (model 74HC154N) and know what I'm doing with the part.

The issue is having the audio directed in a useful way...

I've built the 74HC154N-based design, drawing everything I need (power, ground, address lines) from a PC's DB25 parallel port. This port allows me to source +5vDC lines (x4) and 8 output lines (5vDC).

Pretty much, what I want to do is take my design and make it handle audio... any ideas?

[SuvsareRetarded]

I suggest adding blue LEDs. But seriously if you need help I have a lot of EE friends.

[DeathToWindows]

Serious help would be nice. I have plenty of LEDs.

[SuvsareRetarded]

K. I'll email this link to some peeps.

[The Godfather]

Two of these
http://www.standardics.philips.com/p...switches/4051/

[Dork.]

Ahh, young padawan. Finally learning about the dark side, are you!

Your 74HC154 is a perfectly servicable digital 4-to-16 demultiplexer. However, in order to handle audio signals, you need to adopt the heresy that there are more than two states (on and off) to the universe. When you go to the analog side, you need to start considering such poisonous concepts as gain, bandwidth, and RC-time-constants. These are not all taken care of for you, like they are in the cheery world of digital design.

If sucessfully tame the black magic and voodoo of the analog world you can, a fatter paycheck you will have! Few who enter the analog world survive with their mental facilities intact (or their livers, there's something about analog design that drives people to hard liquor)....

Anyway, as to the specifics of your question:

Originally Posted by The Godfather

Two of these
http://www.standardics.philips.com/p...switches/4051/

What he said. Same demux concept, except the logic insides controls a series of transmission gates, and only one is open at a time. If you truly are doing a 1-to-16 thing here, you might also want to find a buffer chip to split your 1 input signal into 2 signals before feeding them into your demux's. sharing the one node between the two chips may not yield the best result....

[ghporter]

You will need, as Dork. says, to use some sort of analog switch to route the audio, and a good linear buffer amplifier to isolate the source from the outputs as well. There are digitally controlled analog switch ICs around, but I'm not current on any of the stuff anymore, so I can't say "use this one."

[DeathToWindows]

is there any way for me to use the Maxim MAX336 or MAX382 (respectively, 1:16 and 1:8 MUXen)? Or should I just go ahead and order the Phillips parts or equlivient.

[DeathToWindows]

Damn server burps.