Re: ALSA sound recording frustration
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>
>---- Original Message ----
>From: lee@yun.yagibdah.de
>To: debian-user@lists.debian.org
>Subject: Re: ALSA sound recording frustration
>Date: Thu, 27 Nov 2008 19:15:50 -0600
>
>>On Thu, Nov 27, 2008 at 07:06:42PM +0200, Rob de Graaf wrote:
>>
>>> > The headphone connector is for headphones, it is not for
>connecting
>>> > recording devices: If the voltage and/or current are too
>high/much,
>>> > you can damage the soundcard.
>>>
>>> An input which measures voltages (here the microphone input) has
>>> infinite large impedance, hence no current will flow.
>>>
>>> You are correct by the amplitude of the voltage.
>>
>>How can there be voltage (or voltage measured) without current
>>flowing?
>>
>>
>>http://en.wikipedia.org/wiki/Volt:
>>
>>"The volt is defined as the potential difference across a conductor
>>when a current of one ampere dissipates one watt of power."
>>
>>
>>no current <--> no voltage
>>
>>
>>--
>>"Don't let them, daddy. Don't let the stars run down."
>>http://adin.dyndns.org/adin/TheLastQ.htm
>>
I think you are stretching the definitions here. The input impedence
really isn't "infinite" it's just very large. As a result a very
small (but non-zero) current will produce the voltage. Ohms law
still holds
Larry
>>
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>>
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