Geoff, thanks for the explanation. Now, I know why I'm having volume problems.
earlier, Geoff Eden, wrote:
Okay, here we go.
Both your sound card and your triple talk have similar small chip
amplifiers that are, essentially, current pumps. When you put two
of them pumping to the same output, electronically speaking, they
see each other and the impedance, (resistance) of the circuit
changes significantly for both amplifiers and their output will
change accordingly. As two things are never exactly the same, one
will tend to dominate and the other be suppressed.
The solution is to isolate the two audio output streams. If you
don't, eventually you risk burning out one of the amplifier chips.
If you have the skill you could create a small circuit board and
isolate the two output circuits from each other with, probably 10K resistors.
If you don't have the skill, then purchase a very low-cost mixer and
put both channels into it and feed a small amplifier. Some mixers
actually come with an earphone amplifier built into them.
I can't make a recommendation, as the mixer I own is overkill and
costs about $200. I would bet with a little hunting you can find
something for less than 50.
Perhaps somebody here on the list can make a mixer recommendation.
Jeff
-----Original Message----- From: john schwery
Sent: Tuesday, November 20, 2012 9:29 AM
To: pc-audio@pc-audio.org
Subject: mixer?
I posted earlier that I have volume problems with my system. I am
using a PCI triple talk synth and my system volume is drowning out
the volume of my synth. I have my system and my synth running to a y
cord to my headphones. Should I get a sound mixer, and if so, which
mixer. Or, should I get a pre-amp for my synth. I need 2 headphone
level inputs going to a headphone output. I would like volumes on
both inputs and also a volume on the output. Thanks for any help.
John
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John
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