Lab 7: Time-varying Signals & A BJT curve Tracer

Time-varying Signals

Pre-Lab: a) sinusoidal wave.  b) triangular wave.  c) square wave The amplitude of the output would be half of the input. 

This is the set up of the experiment. 

This is input value. Amplitude is 2v.

This is the graph for the sine wave.  The frequency and period are its original value. The amplitude becomes half which is 1V. 

This is the graph for the square wave.  The frequency and period are its original value. The amplitude becomes half which is 1V. 




This is the graph for the triangular wave. The frequency and period are its original value. The amplitude becomes half which is 1V. 

LAB: A BJT curve Tracer

In this lab, we are going to investigate the collector current, IC vs. collector voltage, VCE characteristics of the BJT. We are going to use a breadboard, a 100K Ω Resistors, a 100 Ω Resistor, and a small signal NPN transistor.

Set up of BJT curve tracer circuit

 

Here are our first input wave (Channel 1) and second input wave (Channel 2).

Here is the oscilloscope of the wave it detected.