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Please pass the breadboard February 5, 2009

Posted by Rich in school.

So yesterday I built an oscillator out of some resistors, capacitors, and a couple of transistors. It’s cool, I just hook it up to a power supply and out comes a 5.8 kHz sinusoidal signal! Designing the thing was beastly but it works.

Today I built a digital filter in MATLAB that only passes frequencies around 3 kHz. We used it to filter out a bunch of Morse code that was interfering with the “signal of interest” at 3 kHz. It worked beautifully and we successfully decoded the Morse code signal we wanted without all the interference.

Tomorrow I’ll be working with my group on our Concept Generation and Selection document as part of our senior project. We’ll show why we chose one concept over another; for example, we’re using a matched filter in a digital demodulator — now, should it be a third-order Butterworth lowpass filter or a square root raised cosine? We chose the SRRC pulse shape but we have to document why and what criteria we used to select it.

All in the week of a student electrical engineer.



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