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phantom 48v to t-power 12v adapter?

  
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J.A.A.

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Since: Mar 23, 2005
Posts: 11



(Msg. 1) Posted: Tue Jan 10, 2006 7:16 pm
Post subject: phantom 48v to t-power 12v adapter?
Archived from groups: rec>arts>movies>production>sound (more info?)
Any working low cost solution for feeding t-power mic from phantom 48v
preamp.

I was thinking about to modify my AKG B18B 18v phantombox to work as a
T-Power AB 12v powersupply. any schematics, ideas?

regards,
Jukka

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Douglas Tourtelot

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Since: May 31, 2004
Posts: 512



(Msg. 2) Posted: Tue Jan 10, 2006 7:16 pm
Post subject: Re: phantom 48v to t-power 12v adapter? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I have a PSC for sale; $25 plus shipping. Please contact me off-list if you
are interested.

Regards,


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Douglas Tourtelot, CAS
Seattle, WA
tourtelot RemoveThis @speakeasy.net

"J.A.A." <hyeena RemoveThis @fi.sci> wrote in message
news:oKTwf.364$2f.267@read3.inet.fi...
> Any working low cost solution for feeding t-power mic from phantom 48v
> preamp.
>
> I was thinking about to modify my AKG B18B 18v phantombox to work as a
> T-Power AB 12v powersupply. any schematics, ideas?
>
> regards,
> Jukka

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Richard Crowley

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Since: Jul 28, 2005
Posts: 35



(Msg. 3) Posted: Tue Jan 10, 2006 7:16 pm
Post subject: Re: phantom 48v to t-power 12v adapter? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Jukka wrote ...
>I wonder would that P48t122 work with 18v Phantom as well or does it
>really need true 48v Phantom.

The circuit shown in P48t122 needs a minimum of 12.6V of
"phantom power" because of the 12V shunt regulator provided
by the zener diode (1N5242B) The circuit would work fine
with 18v "phantom".

> If 18V is enought for this design - building whole thing inside
> AKG B18 seems solution for me (no need for extra enclosure, connectors
> etc.) and I wont get -10dB PAD when using early Shure FP24 (it has this
> feature when feeding 48V phantom).

But if you are going to build it into an adapter like the AKG B18,
you don't need either of the 4K7 ohm resistors as shown. You
only need a single (~2K5) resistor directly from the +18V supply
to the top (un-grounded side) of the zener and the filter capacitor
in parallel with it.
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