Soundcard based simple Oscilloscope

[mamech]

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:


any advices?

- - - Updated - - -

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

 

[D.A.(Tony)Stewart]

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.

 

[Audioguru]

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.

 

[D.A.(Tony)Stewart]

With my PC skills at removing Trojans and my dislike of slugware, I do not use any anti-virus programs, except when I download a file, then I use all of them thru a cloud service
https://www.virustotal.com/en/file/...3a37930d6d8a96ed48490e94/analysis/1414302436/

 

[schmitt trigger]

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?

 

[D.A.(Tony)Stewart]

I install the context menu, so when I open the folder, I send to > Virustotal. If the hash is found, result is instant, otherwise queued up for < 1 minute.

Locate the Desktop App which adds the context menu for explorer

https://www.virustotal.com/en/documentation/