Soundcard as an Oscilloscope?

[Zeppelin]

oscilloscope soundcard

I intend to use my soundcard as an oscilloscope. Anybody with first hand experinece? I'm especially looking for the input-protection circuitry.

While I was searching the forum, I came across **broken link removed** post.

Cedance:

yeah... when u use the software desired for running or simulating the function of Oscilloscope there is a high risk of ur sound card getting damaged... i have heard this too. I also have heard the video card also might go off.. u have to watch very carefully reg. teh signal frequency etc.. the thresholds are to be maintained.. since they are nt getting simulated but attaining the o/ps from real hardware.. u have to be doubly careful!

/Am

:?: :?: What is the 'frequency minimum threshold problem' about?
As far as I know, you will only damage the soundcard, if you apply voltages higher than the maximum allowable input; I don't see frequency playing any role here, Am I missing something?

Thank you

 

[hr_rezaee]

Hi
yes, you can use sound card as oscilloscope but max freq must be less than 20k and amplitude of signal bust be limited (-1v<A<1v).
see matlab oscilloscopeit can help you.
regards