optical out sound card for linux?

[James Knott]

tleslie wrote:
> On Sat, 2007-07-07 at 09:57 -0400, phiscock-g851W1bGYuGnS0EtXVNi6w at public.gmane.org wrote:
>   
>>>>> I read that with highest end head phones, they are
>>>>> "extremely high impedance headphones"
>>>>> and they can suck large with cheap
>>>>> sound amps, and I am guessing a sound blaster
>>>>> card is just that.
>>>>>           
>>>  I'm curious if it's just the soundblaster (and PC sound
>>>       
>>>> hardware in general) which sucks, or if the headphones really draw a
>>>> lot of juice.
>>>>         
>> Just to clarify, higher impedance phones would draw *less* current. Ohm's
>> law: I=E/R where R in this case is an impedance.
>>     
>
> Yes thats what i read, apparently these will draw much more, or ask for
> more Voltage, is it possible the voltage requirements are throwing the
> card for a loop?
>
>   

Devices don't "ask" for a voltage.  The voltage (Vl) across the device
is determined by the current flowing through it, which is determined by
the device impedance (Zl), the source voltage (E) and source impedance
(Zs), such that Vl = E * Zl/(Zs + Zl).

-- 
Use OpenOffice.org <http://www.openoffice.org>
--
The Toronto Linux Users Group.      Meetings: http://gtalug.org/
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://gtalug.org/wiki/Mailing_lists