[Asterisk-Users] IAXy Power in Australia?

[Roy Eddleston]

Jeremy

Don't bother looking for a PSU with a lower current rating,  The IAXy
like any electrical device is designed to run at a particular voltage
and consumes a certain amount of power (W) at that voltage.

In simple terms this means that if the voltage is constant and the
design parameters of the device don't change, the device will only draw
the amount of current it needs to operate and no more.  So a device that
draws 500mA at 9V to operate, will only draw 500mA regardless of whether
the PSU is capable of supplying 500mA (0.5A) or 5000mA (5A).  

This is why the electrical supply to your house may be capable of
hundreds of amps (A) but your living room light with a 60W bulb only
draws the 0.25A it needs to operate.

Obviously an underrated PSU will not be able to provide enough current
at the rated voltage and so the voltage will drop and the PSU will
overheat, resulting in failure of the PSU and possibly the device
connected to it, depending on the protection devices in the PSU.  An
overrated PSU (current wise) will just run cooler and be more capable of
delivering the current the attached device needs. 

This is also why it is vital to have a fully regulated or switched PSU
because there is no regulation circuit in the IAXy itself and if the
voltage to the IAXy circuit changes so do its power and current
requirements, making it unstable.

OHM's LAW is a wonderful thing :)

Cheers!

Roy...

 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Jeremy Bogan
> Sent: 28 August 2004 22:07
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] IAXy Power in Australia?
> 
> > Have you tried feeding it less amps at all?
> 
> Not yet, but i'll see if I can find a power supply with less amps.
> 
> --
> jeremy bogan    [ jeremy at segpub.com.au ]
> segment publishing - design.develop.host
> 
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