Today, I wired up the power PCB boards for the DC motors and then talked and read about Halleffect sensors. The box that will hold the sensors is too small, so we spent some time figuring a way to combine two boxes into one to fit all of our components. Then, we spent a lot of time talking about transfer functions, Laplace transforms and how they help us disentangle linear, timedependent equations from their timerelationship and yield convenient equations that describe the behavior of a system at different frequencies.
We want to apply a highpass filter to "remove" the lowfrequency noise from the signal in our Halleffect sensors and achieve low frequency seismic noise isolation. So, we used the following highpass filter circuit and found its transfer function V_{out}/V_{in}. It is my homework to find the values for R_{1}, R_{2}, R_{3}, C_{1}, and C_{2}, so that our transfer function gives large output at high frequencies (above 50Hz) and small output at low ones (below 5Hz).
