Matt Duwe CSU Fellow EE Scott Kindt Physics Teacher Robb Sommerfeld P.O.E. Teacher Mil Santos Algebra II Teacher

Amplifier Project Objective

Working in project teams, students will design & build a stereo system that will amplify the audio signal from an I-Pod.

Project teams will be divided into three groups.

(a) Amplifier design. Outsource schematic to Kate’s students.

(b) Power supply & box for electronics.

(c) Speaker & cross-over filter Design.

Stage 1 will involve building the Kelvin 20 Watt Amplifier Kit

Initial Teaching Objectives

Students will learn the basics on: -Circuits, resistors, capacitors,

transistors -Ohm’s Law, Power equation.

Time Linehttp://www.rockymountainstars.com/Amplifier_Project_CSU_GK12.htm

Group A will design the amplifier section.

Kate’s students will make the printed circuit boards for the amp.

Group B will build the power supply to meet the amp requirements.

Group C will build the speakers & filter circuit.

Sample Speakers

Role of the Junior Fellow

The Junior Fellow will be responsible for integrating all the parts into a working system.

Does the power supply meet the requirements for the amplifier?

Do the speakers have the efficiency to match the amplifier output?

Are we under the $100 budget?

What will the finished product look like????

Solar powered stereo.Hand crank up stereo.Vacuum tube amplifier.Portable battery powered stereo.

Standard solid state amplifier.

The Testing Phase

Power in vs. Power out, amplifier efficiency

Maximum output in db Frequency Response Harmonic Distortion Cross-over point for speaker filter Other measurements

Quantify & Evaluate the Data

The Project in Robb Sommerfeld’s class.

Robb’s POE class will devote more time to material science along with the CAD design & construction of the amplifier box.

Students will have the opportunity experiment with different materials to build the stereo & speakers around the Kelvin 20 watt amplifier.

Example of Design Process

1. Define a Problem2. Brainstorm3. Research and Generate Ideas4. Identify Criteria and Specify

Constraints5. Explore Possibilities6. Select an Approach7. Develop a Design Proposal8. Make a Model or Prototype9. Test and Evaluate the Design

using Specifications10. Refine the Design11. Create or Make Solution12. Communicate Processes and

Results

– ITEA Standards for Technological Literacy

Alternative Speaker Box

THE TEAM’S MISSION

Design

Brief

The Project in Mil’s Algebra II class

Mil’s Algebra II classes will build the Kelvin 20 watt amplifier however their focus will be on testing and measuring the electronics.

The Algebra II classes will also test the custom designed amplifiers made in the physics classes. The results will be compared to the Kelvin amplifier kits.

Audio Testing & Applications in Algebra II

What will students gain by doing this project?

Application of the Design process. Working together as an engineering team. Principle behind amplifiers & circuit design. Power Supplies, AC-DC conversion, rectifiers. Hi pass, low pass filters with capacitors &

inductors. How to test electronic equipment, amps &

speakers. Efficiency of amplifiers. Application s of Algebra II & Engineering. How to make a scientific poster. How to present your project & ideas to a general

audience.

Second Semester Geo Science Unit on Meteorology

How Doppler radar works Microwave frequencies Doppler Effect CSU CHILL Radar Interpreting weather radar Doppler Radar Gun to measure speed

CSU CHILL Radar

Microwave Radar Gun