Phantom power from the computer?

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HI all,
Does anyone know if it's possible to use a computer's existing
power taps to build a phantom power source for use with a Delta
1010LT's mic inputs? My delta card has two mic preamps but no phantom
power source, and though it's not crucial, I'd like to have phantom
power available to them if need be. Has anyone dealt with this
situation before? Any suggestions? Thanks
William J

 

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"William J." <WillsJS@hotmail.com> wrote in message
news:jgb6u01g3nipoi506fn0qugni9oqm31i2u@4ax.com

> Does anyone know if it's possible to use a computer's existing
> power taps to build a phantom power source for use with a Delta
> 1010LT's mic inputs? My delta card has two mic preamps but no phantom
> power source, and though it's not crucial, I'd like to have phantom
> power available to them if need be. Has anyone dealt with this
> situation before? Any suggestions? Thanks

Tain't nothing over +12 volts among any of the standard outputs of computer
power supply.

One popular approach is to add a voltage-quadrupling switching power supply
such as the one found in this schematic:

http/www.rane.com/pdf/ms1bsch.pdf

see the parts around Q4, D1, and the LM317L

You also can solve this problem by either front-ending the 1010LT's line
inputs with a small mixer that has phantom power (2 channels) and inserts
(more than 2 channels), adding external mic preamps, or getting a phantom
power adapator such as those provided by Audio Technica.

 

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>Does anyone know if it's possible to use a computer's existing
>power taps to build a phantom power source for use with a Delta
>1010LT's mic inputs? My delta card has two mic preamps but no phantom
>power source, and though it's not crucial, I'd like to have phantom
>power available to them if need be. Has anyone dealt with this
>situation before? Any suggestions? Thanks
>William J

get an outboard phantom supply.
Phil Brown

 

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William J. wrote:

> My delta card has two mic preamps but no phantom
> power source, and though it's not crucial, I'd like to have phantom
> power available to them if need be.

That sound to me like lots more trouble than it's worth, unless you
enjoy doing that kind of thing. I'd just get an Audio_Technica or other
outboard phantom supply and be done with it.

--
ha

 

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In article <jgb6u01g3nipoi506fn0qugni9oqm31i2u@4ax.com> WillsJS@hotmail.com writes:

> Does anyone know if it's possible to use a computer's existing
> power taps to build a phantom power source for use with a Delta
> 1010LT's mic inputs?

Possible? Sure. Practical, no. You'd need a DC-DC converter to step up
the internal 5 or 12 volt supply, then you'd have to get it to the mic
inputs through the appropriate resistors. The cost is probably why
M-Audio didn't do it in the first place.

> Has anyone dealt with this situation before? Any suggestions?

Sure, with an outboard phantom power supply, or for even better
performance, an outboard mic preamp with phantom power that's better
than the internal preamp.

Audio-Technica, among others, makes an outboard phantom power supply.


--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

 

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On Tue, 11 Jan 2005 01:44:38 GMT, William J. <WillsJS@hotmail.com>
wrote:

>HI all,
> Does anyone know if it's possible to use a computer's existing
>power taps to build a phantom power source for use with a Delta
>1010LT's mic inputs? My delta card has two mic preamps but no phantom
>power source, and though it's not crucial, I'd like to have phantom
>power available to them if need be. Has anyone dealt with this
>situation before? Any suggestions? Thanks
>William J

Whatever you do is likely to be more trouble and expense than getting
a small mixer or stand-alone phantom power box.

You need a mixer anyway, surely? Why else have a card with multiple
audio outs?

CubaseFAQ www.laurencepayne.co.uk/CubaseFAQ.htm
"Possibly the world's least impressive web site": George Perfect

 

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Archived from groups: rec.audio.pro (More info?)

On Tue, 11 Jan 2005 01:44:38 GMT, William J. <WillsJS@hotmail.com>
wrote:

>HI all,
> Does anyone know if it's possible to use a computer's existing
>power taps to build a phantom power source for use with a Delta
>1010LT's mic inputs? My delta card has two mic preamps but no phantom
>power source, and though it's not crucial, I'd like to have phantom
>power available to them if need be. Has anyone dealt with this
>situation before? Any suggestions? Thanks
>William J

It would be too complex for a one-off DIY project. If you get it
wrong, you smoke the Delta card ... or maybe more. Even if you get it
right, it could introduce noise to your mic inputs.

Buy an outboard phantom power supply. Make sure that the one you buy
will work with all of your mics that need phantom power. Some mics are
OK with as little as +12V at 2mA (most AKG); others require a full
+48V at 6mA.

Mike T.