Intro to FreeMat

The following are clips from the FreeMat Lab tutorial package:

FreeMat has many different functions that will be helpful when solving mathematical problems :)

May 5 Class Lab

We have an Alternating Current circuit and applied signal to alter its image. 

We attempted to calculate the value for the capacitor

Notice:

Frequency vs. Voltage

30Hz - 2V

40Hz - 1.84V

50Hz - 1.68 V

60Hz - 1.54V

70Hz - 1.40V

80Hz - 1.28V

90Hz - 1.18V

Not a linear relationship

A larger value for frequency makes the voltage drop (a 1/f ratio almost).

Applying a 100Hz would result in a 1.08V and cause a phase shift
We resulted  with a  sinusoidal wave that changed its appearance as frequency was increased

There comes a point where the capacitor begins to act like a short circuit 

May 7 Class Lab

Using FreeMat

In class we practiced using FreeMat with complex numbers and transforming rectangular equations into polar form.

FreeMat is an extremely helpful tool when dealing with complicated math problems. It is beneficial for engineers to learn how to use this program to help them in their careers in allowing them to focus more on the process of the problem rather than the math alone.

April 28 Class Lab

OPERATIONAL AMPLIFIERS

AMPLIFIER PROBLEM: The range of  Vsensor is 0-1V and we desire 0-10V

 Use a 741 op-amp

Conditions:

Circuit must draw no more than 1mA

Power supply must not exceed 30mW each

Resistors should be 1/4W (standard)

Desired circuit:

Inverting amplifier with a gain of -10


Through calculations we concluded with using two resistances of  1000 Ohms for Rx and 909 Ohms for Ry.
Rth= 834.01 Ohms. The experiment was then done to test our theoretical values:

The table below shows our results:

Our goal was to obtain a gain of -10. Our data concluded verifying this through experimental practice. We learned about the power of op-amps and about different ways to confront a situation. Small variability can be neglected due to human or tool error.

Combat Robot Pictures