[Asterisk-Users] OT: Grandstream power supplies..

[Brenton D. Rothchild]

Generally speaking, something like this would require a regulated power
supply,
as the internal components are most likely needing 5VDC, instead of the
phone
taking over 5V and regulating the power itself (which drops the voltage in
the
process, hence taking over 5V...).  I'm guessing that you will require at
least
a regulated supply.

You don't necessarily need a switch mode power supply.  Their benefits, as I
understand them, only come into play for large power applications where
efficiency
and power factor come into play.  The main benefits of switch mode for you
would
be, most likely, a smaller footprint and a slightly better power efficieny
(somewhere
on the order of 1 Watt).

When you talk of variable adapters that are either 4.5V or 6V, does that
mean
that they range from 0-4.5V and 0-6V (as in variable)?  If so, you could use
a 6V variable set for 5V output.

Looking at Maplin's website, your best shot might be the '15W SMPS AC/DC
Adaptors',
Order Code PJ85G - 5VDC output at 2.5A.  You're right, Maplin is expensive.

The only thing I would stress is that if your phone is malfunctioning and
drawing
more current than the previous 400mA adapter could source (hence the failure
of
the previous adaptor), this larger current adaptor would allow the phone to
draw
even _more_ current, probably releasing some of the magic smoke inside the
electronics
(which is what makes ICs work, right? :)

-Brenton


----- Original Message -----
From: "WipeOut ." <wipeout at linuxmail.org>
To: <asterisk-users at lists.digium.com>
Sent: Tuesday, August 12, 2003 7:09 AM
Subject: [Asterisk-Users] OT: Grandstream power supplies..


> Hi,
>
> Quick question to all the electronics gurus out there..
>
> I unpacked my second GS phone yesterday (had it for about a month!) and
set it up.. This morning the power supply is dead..
>
> I have looked for a new one online (In the UK using Maplin let me know if
you know a better place.) becasue it would probbaly take too long to get one
sent from China or the US and I need to get that station operational again..
>
> There seem to be many choices for power supplies.. Looking on the bottom
of the broken one it is a 5VDC 400mA output.. When I looked online for a new
one the choices are for regulated, unregulated and switch mode power
supplies with the regulated and switch mode ones being VERY much more
expensive than the unregulated ones..
>
> Which kind would do the job??
>
> Also most of the variable output adapters are 4.5v or 6v, Not the required
5v..
>
> Any help would be appreciated..
>
> Thanks..
> --
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