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One limitation is the sample rate, another the A/C coupling of the input. I think it may still be useful to test the sound card oscilloscope on your circuits,as long as you are aware of the limitations. Another option is to use a cheap controller board such as an Arduino with firmware to capture ADC readings and display this data on a PC. There are plenty of examples around, and would cost much less than 10% of a real oscilloscope. Here is a simple project I made for different Arduino / AVR controllers, with a PC display program: https://github.com/ccrause/LazScope