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Soundcard based simple Oscilloscope

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mamech

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hello everyone

some years ago, I used my sound card as oscilloscope, and I remember that I got good results, and that I saw square wave on the screen from an opamp based oscillator. I was using a coaxial cable with crocodiles for connection. I remember that I did this on my old PC.

these days I wanted to repeat this interesting experience, but I do not have same material that I had before, this timeI do this with my labtop, and I searched for the same jack that I used with soundcard (the old jack is the only thing that I found again) , and this time I connected it directly to crocodiles for connection. but the problem is that things does not work as before. I built a square wave generator and I tried to see anything, but nothing appear. here you photos of the cable: Picture of me 2.png
Picture of me 3.png

any advices?

- - - Updated - - -

sorry, I solved. there was just short circuit inside the jack terminals :)
 

SunnySkyguy

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If you can get a long 3.5mm Audio cable you can use the AUX input for a scope input or the MIC input for low level signals.

Naturally the audio source must be selected under Windows and use a free program like Audacity. It can also be used as a sweep generator or square wave , noise or DTMF generator.

audacity.jpg
 

Audioguru

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Thanks, SunnySkyguy.
My old computer had Audacity but when I got my new computer a few months ago when I downloaded Audacity my anti-virus software found a virus in it so it was deleted. I tried downloading it a few times then I gave up. Today my download from Cnet works fine.
 

SunnySkyguy

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schmitt trigger

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SSguy..
this is interesting...cloud based virus scan.

But how does it work. Let's say I wan't to download a video converter software. How do I make sure it is virus free?
Do I drag and drop it into virustotal? Do I copy and paste the URL? Other?
 

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