Greets All

I plan on Using my laptop as a cheap oscilloscope using Visual
Analyzer 2009 does anyone know the amount of current that the mic in
port of a laptop can handle (don't want to blow the mic in port)  I'll
only be measure in the audio range but will be coupling the ac signal
with a DC signal.  Using this circuit http://scitoys.com/scitoys/scitoys/light/light.html

I want to see what the signal looks like that comes out of the laser
communicator.

Aloha
tia sal2

r...@gmail.com wrote:
> Greets All
> 
> I plan on Using my laptop as a cheap oscilloscope using Visual
> Analyzer 2009 does anyone know the amount of current that the mic in
> port of a laptop can handle (don't want to blow the mic in port)  I'll
> only be measure in the audio range but will be coupling the ac signal
> with a DC signal.  Using this circuit http://scitoys.com/scitoys/scitoys/light/light.html
> 
> I want to see what the signal looks like that comes out of the laser
> communicator.
> 
> Aloha
> tia sal2
600 mv pk. I would use a couple of 1n914 diodes in parallel back to
front to protect the computer on the computer side of the transformer.


Good day.

On Wed, 27 May 2009 21:09:49 -0400, Jamie
<j...@charter.net>
wrote:

>r...@gmail.com wrote:
>> Greets All
>> 
>> I plan on Using my laptop as a cheap oscilloscope using Visual
>> Analyzer 2009 does anyone know the amount of current that the mic in
>> port of a laptop can handle (don't want to blow the mic in port)  I'll
>> only be measure in the audio range but will be coupling the ac signal
>> with a DC signal.  Using this circuit http://scitoys.com/scitoys/scitoys/light/light.html
>> 
>> I want to see what the signal looks like that comes out of the laser
>> communicator.
>> 
>> Aloha
>> tia sal2
>600 mv pk. I would use a couple of 1n914 diodes in parallel back to
>front to protect the computer on the computer side of the transformer.
>

Or use Line In, which is good for at least 3V
pk-pk and usually closer to 5V.  The diodes are
still a good idea.  Even better, use a series
resistor (1K to 10K) ahead of the anti-parallel
diodes.  (View in monospaced font):

Outside world ---- R -o--o--- Sound Card
                      |  |
                      -  V
                      ^  -
                      |  |
  ---------------------------- 


Best regards,


Bob Masta
 
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