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

 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.

 Students will learn the basics on:  -Circuits, resistors, capacitors, transistors -Ohm’s Law, Power equation. Time Line _Project_CSU_GK12.htm

 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?

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

 Power in vs. Power out, amplifier efficiency  Maximum output in db  Frequency Response  Harmonic Distortion  Cross-over point for speaker filter  Other measurements

 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.

1.Define a Problem 2.Brainstorm 3.Research and Generate Ideas 4.Identify Criteria and Specify Constraints 5.Explore Possibilities 6.Select an Approach 7.Develop a Design Proposal 8.Make a Model or Prototype 9.Test and Evaluate the Design using Specifications 10.Refine the Design 11.Create or Make Solution 12.Communicate Processes and Results – ITEA Standards for Technological Literacy

Design Brief

 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.

 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.

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