ECE 2280 Labs
Project 1: Regulated DC Power Supply
Design a dual rail, regulated, DC power supply to supply enough current to operate an op-amp based microphone and speaker circuit created as part of the second class lab and supported by the concepts of the third lab.
Lab 1 – Exploring Signals and Bode Plots
- Reacquaint yourself with the laboratory equipment and procedures
- Compare experimental and derived Bode Plots
- Understand Bode plots
- Lab 1 handout
Lab 2 – Op-amp Circuits
- Become familiar with operational amplifier circuits
- Design circuits containing operational amplifier(s) to meet given requirements
- Construct, test, and debug operational amplifier circuits
- Lab 2 handout
Lab 3 – Diodes
- Understand the basic operation and characteristics of a diode
- Understand basic circuits containing a diode
- Lab 3 handout
DC power supplies are extremely common in the world of electronics. They are used for almost every type of electronic equipment (i.e. computers, TVs, stereos, cell phones, etc.). In addition to requiring a DC voltage, most equipment requires that the voltage be well controlled or regulated. Design a dual-rail, regulated, DC power supply to supply enough current to operate the microphone and speaker circuit from lab #2.
Design a dual-rail, any voltage, regulated, DC power supply capable of supplying enough current and voltage to operate the microphone and speaker circuit from lab #2. The power supply is to be powered from the wall outlet. The supply must have a maximum voltage ripple of 1%.
Project Documents and Files
Project 2: MOSFET Audio Amplifier
Lab 4 – MOSFET Transistors
- Understand the MosFet operation
- Finding the process transconductance parameter along with the threshold voltage for both the p-type and n-type MosFet
- Understand how the MosFet can be used to supply current to an amplifier through a current mirror configuration
- Understand how the MosFet can be used as an amplifier
- Lab 4 handout
Design a MOSFET amplifier(s). Establish a DC bias point by selecting appropriate values. Design for a large gain, low output impedance, and high input impedance. Investigate the frequency response of a two-stage amplifier.
Design a multi-stage amplifier(s) to work as the noninverting amplifier for the previous microphone/speaker circuit: voltage gain of |Av| = 101 V/V, low output impedance and high input impedance. Your amplifier(s) has to work in the microphone/speaker circuit.
Project 3: Multistage Audio Amplifier
Lab 5 – BJT Transistors
- Become familiar with the operation of the BJT transistor
- Testing the BJT transistor in a circuit
- Investigating the use of the BJT for impedance matching
- Building and testing an amplifier
- Lab 5 handout
Design a multi-stage amplifier. Establish a DC bias point(s) by selecting appropriate values. Design for a large gain, low output impedance, and high input impedance. Investigate the frequency response of a multistage amplifier.
Design a multi-stage amplifier to have enough gain to amplify your voice signal to hear it at a normal level out of the speaker. (It must not sound like a whisper.) You will need to have enough power to drive the speaker. You cannot have any clipping or distortion. Your low frequency 3dB should be less than 100Hz. You need to use at least 1 BJT amplifier (any configuration). You need at least two stages for the amplifier (suggest using a common collector as the last stage).