1.) 1. (Table and graph) Use the transistor by itself. The goal is to create the graph for IC (y axis) versus VBE (x axis). Connect base and collector. DO NOT EXCEED 1 V for VBE. Make sure you have the required voltage value set before applying it to the base. Transistor might get really hot. Do not TOUCH THE TRANSISTOR! Make sure to get enough data points to graph. (Suggestion: measure for VBE = 0V, 0.5V, and 1V and fill the gaps if necessary by taking extra measurements).
Figure 1: VBE and Ic
Figure 2: Voltage vs. Current
- The circuit presented in Figure 1 of the worksheet was built on the breadboard. We then added different voltage values all of them below one, in order to see the relationship between VBE and IC. The data means that there is a certain voltage (VBE) required before Ic can flow.
2.) (Table and graph) Create the graph for IC (y axis) versus VCE (x axis). Vary VCE from 0 V to 5 V. Do this measurement for 3 different VBE values: 0V, 0.7V, and 0.8V.
Figure 3: IC vs VCE
Figure 4: Table of data graphed in figure 3.
- We built a circuit as the one in problem one, this time with two different voltage values. We performed three different trials with different voltage values for each one. We started off with an initial voltage of zero, which gave us 0 current independently from the second voltage added to it. We then bumped the voltage to 0.7, which gave us an increasing current value dependent on the second voltage added. On trial number 3 the results were similar to trial number 2, just a little bit higher since we bumped up the initial voltage from 0.7 to 0.8. The data is interpreted as Ic being dependent on VCE which are both dependent on VBE.
3.) (Table) Apply the following bias voltages and fill out the table. How is IC and IB related? Does your data support your theory?
|Figure 5: Table displaying data of relationship between IC and IB|