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Headset volume issue

 
 
naza
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      12-25-2007
I have brought a 5.1 surround sound system for my PC, it all works
fine, but before i brough it I had a set with speakers, non-amplified
and a headset which I used for Voip and games. Because they were non-
amplified all the volume sliders were max, jsut to get a slight
output, which worked fine, as I mainly just used the headset. But now
the 5.1 surround sound system has it own amplifier in it, so leaving
the volume sliders so high is not an options as the sound gets
clipped, and sooner or later the amplfier in the speakers will go as
well. I have reduced the volume but now the volume of the headset is
just too low. I have checked the settings and the headset port is set
correctly and the ouput from that port is for headphone, not lineout.
Is there a solution to my problem, I a headphone jack on the speakers
but no mic. Is there some sort of external amplifier that I can use to
increase the volume?
 
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Paul
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      12-25-2007
naza wrote:
> I have brought a 5.1 surround sound system for my PC, it all works
> fine, but before i brough it I had a set with speakers, non-amplified
> and a headset which I used for Voip and games. Because they were non-
> amplified all the volume sliders were max, jsut to get a slight
> output, which worked fine, as I mainly just used the headset. But now
> the 5.1 surround sound system has it own amplifier in it, so leaving
> the volume sliders so high is not an options as the sound gets
> clipped, and sooner or later the amplfier in the speakers will go as
> well. I have reduced the volume but now the volume of the headset is
> just too low. I have checked the settings and the headset port is set
> correctly and the ouput from that port is for headphone, not lineout.
> Is there a solution to my problem, I a headphone jack on the speakers
> but no mic. Is there some sort of external amplifier that I can use to
> increase the volume?


I looked for "USB powered headphone amplifier" and found this.
What is wrong with it ? No volume control. You need a separate
volume control, so you can achieve the right balance between
devices.

http://www.boostaroo.com/store_detail.php4?id=11
http://www.boostaroo.com/pdfs/T794_Owners_Manual.pdf

There is a RadioShack version, but it runs on batteries.
(A typical RadioShack trick to keep you enslaved, and quite
unnecessary if you can find a good USB powered version.)

******* Geeky section *******
To make a volume control, you could use a dual potentiometer.

To start, the amplifier in the original Boostaroo is shown
here. The TDA7050 is a small device, intended specifically
for headphones.

http://www.nxp.com/#/pip/pip=[pip=TDA7050_CNV_2]|pp=[v=d,t=pip,i=TDA7050_CNV_2,fi=,ps=0][0]

You can see how NXP (Philips Semiconductor) intended to control
the volume, here. The two 22K ohm potentiometers have a total
of six terminals, three terminals for each channel. Basically,
the potentiometers form attenuators, that sit in front of
the amplifier chip.

http://www.nxp.com/products/blockdiagrams/MSB405.gif

This shows the same basic information as the NXP diagram. The
right hand diagram shows the wiring for one channel of the stereo
pair. There are two "wafers" on the dual pot, meaning there is
room to control two channels by rotating the same potentiometer
shaft. (I.e. It is a stereo volume control.)

http://www.bcae1.com/images/gifs/volcont.gif

This Radio Shack product 271-1732, is a dual volume control for
stereo applications. Yes, it is 100K, but it will still work.

http://www.radioshack.com/product/in...ductId=2062359

There is a closeup of the connections on the volume control
device here. The middle pin of the two sets-of-three, is the
wiper contact. The outside pins are the ends of the resistance
material.

http://www.applefritter.com/images/pot-5443.jpg

You would need male and female 1/8" stereo plug and jack, some
wire, solder, soldering iron, and some help, to put all that
stuff together, to make something useful from your boostaroo.

******* End Geeky bits *******

If I could find a reasonably priced product, that didn't use
batteries, and had a volume control, I wouldn't be reduced
to showing you that. The problem with audiophile equipment,
is the steep price. For example, I saw a headphone amp for
$1000 and that isn't reasonable for anybody. But the
people who make the cheap stuff, need to be beaten with a
clue stick, because they miss the most important of
details (volume control).

I cannot expect you to solder together an attenuator, to
make something useful from that Boosteroo, but at least
I can demonstrate the missing bits.

Your local stereo store may have something better to offer.
Tell them what you want to do, that the solution must have
a volume control, and they'll help you out. You won't get
the solution for $50 though.

Paul
 
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