Issue with Talons

[Ether]

Originally Posted by RyanN

As scary as it sounds, you can also use a computer's line-in port and Audacity to take in a waveform.

True. I've been meaning to try that sometime. I use Audacity all the time for ripping my old collection of cassette tapes.

You'll want to use a voltage divider to limit the voltage going into your PC as to not fry your sound card, but it's doable and works pretty well in my experience.
http://www.ledametrix.com/oscope/index.html

What's the input impedance of a typical sound card, do you know? It looks like he's got the voltage divider bass-ackwards. He said he wanted to divide his 5-volt input down to 1 or 2 volts.

Food for thought:
If all you are trying to do is measure the timing (not observe the waveform) of a digital signal then you don't need the sound card's ADC. All you want is to capture and timestamp the edges. The parallel port works great for this. You can poll the data pins of a parallel port at 680KHz or so... way beyond the frequency of the audio card.