Enterprising undergrad engineering students can achieve a lot if given the right set of tools. Once you level up to designing some complex circuits, a signal generator and an oscilloscope would definitely go a long way in helping you in debugging your projects. I bought my first oscilloscope ( Acute DS1202 200MHz PC based) for INR 37,500 after accumulating my salary for 4 months at my first job. But I always wished I has an access to an oscilloscope as a student. It seems that now days there is a low cost option for students to use: the PCs sound card. Most modern motherboards have an onboard Audio Codec Chip which is used to accept and output sound, you can find atleast 3 audio jacks labeled Microphone, Line In and Line Out on the back side of your CPU Cabinet. You can then use specialized freeware/shareware applications which can turn your PC into an Oscilloscope/Signal Generator. Here are screen shots of some of these: Oscilloscope 2.51 (aka Winscope) - the captured wavefor...