If you want to analyze electronics waveform you need an Oscilloscope. Unfortunately, the price for good scope is too expesive. There are good enough solution for this, you can try use PC based Oscilloscope like visual analyser. The scope uses your Sound card as ADC. Since it use soundcard, the oscilloscope only work with signal that has range frequency 20-20kHz. But, I thinks it very useful for student and hobbyist.