[Arny Krueger]

"mcp6453" wrote in message

On 5/1/2011 7:31 PM, Phil W wrote:
"mcp6453":

Is tying the left and right outputs of a computer sound
card together a problem?

http://goo.gl/s1Brc

read this
http://www.rane.com/note109.html

and check out some of the other Rane notes (Support - Library) for
useful general information.


hope that helps,
Phil

Les and Phil, thanks for the article. I totally
understand the problem. My question probably centers more
around whether computer manufacturers have already
included a resistor in series with the outputs to prevent
damage when the outputs are shorted or combined. Any
thoughts?

It's pretty standard to put a "building out" resistor in series with the
off-board output of any op amp.

Value - 22, 75, 220, 620 ohms.

It is also pretty standard to include some kind of short-circuit protection.

That all said, the 100% safe (or as close to that as you can get) solution
for Y-cables includes some series resistors of its own. I usually use 620
ohm resistors.