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Re: Samson S-phantom power unit (was External mic suggestion

Subject: Re: Samson S-phantom power unit (was External mic suggestion
From: "John Hartog" hartogj
Date: Thu May 29, 2008 2:56 pm ((PDT))
Hello,

It is hard to infer the normal operating voltage range from the 18V
figure on the S-phantom. It would be worth inquiring directly to
Samson's tech department.

I say this because, when I inquired to Art about their unit's 12V
figure, I found out the actual range is 12-24V. So 12V is actually the
minimum required voltage.

I am betting the voltage range for the Samson will turn out to be
about the same as for the Art and the Rolls.

I run both my Art and Rolls off AAx12 NiMH sleds which provide more
than 10 hours full power.

John Hartog




--- In  Rob Danielson <> wrote:
>
> At 10:16 AM +0000 5/29/08, Philip Tyler wrote:
> >Hi
> >
> >I don't know about the performance of the Samson unit, but both the
> >Rolls and Art units seem to perform excellently judging by the tests
> >Rob has carried out.
> >
> >But it might be worth pointing out that both the Rolls and Art
> >phantom units can be powered from 'internal' batteries, looking at
> >the PDF for the Samson it looks like it can only be powered by an
> >external DC supply which plugs into it's DC in which you could do.
> >But as the Rolls and Art devices have space for internal
> >batteries it would make for a neater unit?
>
> As Phil points out, the Samson seems to require 18volts DC through
> the external "coax" jack. If the unit matches noise performance with
> the Art and Rolls units (which iI cannot vouch for), the 18 volt DC
> requirement is not necessarily a bad thing because:
>
> 1) 2- 9 volt alkaline batteries internally installed on the Art and
> Rolls only last about 2 hours with moderate current mics (2-3ma).
>
> 2) Rechargeable 9 volt batteries are quite expensive and not very
> powerful. They will run the Art/Rolls units for only ~1.0 - 1.5 hours.
>
>
> Its great to be able to leave the phantom power supply and recorder
> "on" to enable instant monitoring and recording all the time you are
> hiking/recording. So, comparing coax/external powering on all three
> units: The Samson might run significantly longer on a sled/battery
> pack comprised of 15 - AA size rechargeable batteries (18 volts) than
> the Rolls/Art externally powered with a sled/battery pack of 10- AA
> size rechargeable batteries (12 volts). I get about 8-10 hours using
> a 12 volt (10 X 2500ma AA cells) battery pack on my Art Phantom.
> Rechargeable batteries are pretty much the only way to go for a
> number of reasons.
>
> A downside to 18 volts requirement is its harder to find a charger
> for packs over 16 volts DC. Rob D.
>
> >
> >Phil
> >
> >
> >----- Original Message ----
> >From: oatcruncher <<maxcatterwell%40o2.co.uk>>
> >To:
>
><naturerecordists%40yahoogroups.com>=
m
> >Sent: Thursday, 29 May, 2008 10:08:53 AM
> >Subject: [Nature Recordists] Re:External mic suggestions for
Olympus LS-10
> >
> >In relation to this, does anyone on the group have experience
> >of/knowledge of S-phantom power supplies as per this link please?
> ><http://www.samsonte>http://www.samsonte ch.com/products/
> >productpage. cfm?prodID=3D 1747
> >Max
> >
> >--- In naturerecordists@ yahoogroups. com, Rob Danielson <type@>
> >wrote:
> >>
> >>  At 4:49 PM -0700 5/28/08, peter rhalter wrote:
> >>  >The Denecke PS-2 - Portable Dual 48V Phantom Power Supply is
> >another
> >>  >option. You will also need a double XLR to 3.5mm cable. If the LS-
> >10
> >>  >provides plug-in power, you may need to either turn it off or
> >block
> >>  >it to avoid added hum.
> >>  >Peter
> >>  >
> >>  Hi Peter--
> >>  Yes, I can confirm there is a possibility of hum. I found that the
> >>  Denecke PS-2 unit can generate a hum when used with some recorders
> >>  that have Power in Plug (PIP) mic inputs. I got a loud hum with all
> >>  of the Sony and Sharp consumer products I tested and the capacitors
> >>  needed to eliminate it (block the DC) affected LF response more
> >that
> >>  I would have wanted. The PS-2 may work with the LS-10, but it
> >might
> >>  be wise to make sure that you can return the unit in case it
> >doesn't.
> >>
> >>  I know it seems like using a $40-70 device between expensive mics
> >and
> >>  a recorder doesn't make sense monetarily, but Eric Benjamin bench
> >>  tested the Rolls unit and found that it will not introduce noise
> >even
> >>  when used with the the lowest noise, low impedance mics and lowest
> >>  noise recorders. I A/B'd the Rolls and Art and found there is no
> >>  audible difference in the noise performance between the two. Both
> >>  units produce 48 volts.
> >>
> >>  Curt Olson reported that he removed the Art Phantom II's printed
> >>  circuit board from the metal case (and also left behind the two XLR
> >>  outputs) with no ill effects to make it a much smaller unit.
> >  >
> >>  The phantom supplies do require considerable power so you might
> >want
> >>  to consider making a 10 X AA cell (NiMH rechargeable? ) sled if you
> >  > want to record or monitor for long periods of time. Rob D.
> >>  --
> >>
> >
> >__________________________________________________________
> >Sent from Yahoo! Mail.
> >A Smarter Email
>
><http://uk.docs.yahoo.com/nowyoucan.html>http://uk.docs.yahoo.com/nowyouca=
n.html
> >
> >
> >
>
>
> --
>
>
>





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