looking for schems to build 48 ph power supply

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"Mike Rivers" wrote ...
> Are you sure you want phantom power with that voltage? There's an
> official phantom power of 12V and some mics are designed to work with
> as low as 9V, but with a range like that, you may be talking about a
> different (not phantom) power scheme like that used to power condenser
> mics in aircraft headsets. That applies the voltage across the mic
> wires (the single-ended center conductor and the shield) through a
> resistor, and a capacitor is used to isolate the DC from the powered
> microphone output.
>
> Phantom power applies the same voltage (referneced to ground or
> shield) to both leads of a two-wire microphone connection, and it's
> most commonly 48V.

Oleg knows what 48p is. (From reading about his years of
experiences on r.a.m.p.s) But indeed, it would be better to
have a few more details about what he is trying to do.

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> >>I am looking for schemes to build 48 ph power supply which can work with
> >>6-18 v dc range


Marlin P. Jones & Assoc., Inc
10V to 20V in (+12V to 48V ) 48V out
http://www.mpja.com/productview.asp?product=15438+PS
$10.95

--

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

In article <10qucbqc0j39k5d@corp.supernews.com> rcrowley7@xprt.net writes:

> Oleg knows what 48p is. (From reading about his years of
> experiences on r.a.m.p.s) But indeed, it would be better to
> have a few more details about what he is trying to do.

Oh, boy, did I misread that query! I saw the "48" part the second time
around, and the mention of a lower voltage range triggered an
experience I had recently with powering aircraft headset microphones.
Sorry for the misdirected reply.

I'd use a DC-DC converter, or a stock phantom supply and a commercial
inverter. No sense in trying to build something you can buy.

--
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
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Tom Loredo <loredo@somewhere.cornell.edu> wrote:
>
>Another simple example, much like Scott's idea but using inverters
>as the oscillator, and "doublers" instead of a transformer:
>
>http://paia.com/phantsch.gif

One caution: all of the circuits called out so far will not meet the
P48V current specification. Many of them will struggle to put out 2 or 3
mA and then drop their voltage under the stress.

If you're using a mic that has a high phantom power current requirement
(e.g., Earthworks, Schoeps), these circuits will not work.

--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
moskowit@core-sound.com Tel: 201-801-0812, FAX: 201-801-0912