ECE 791/792 Oral Proposal Project Team: Peter Lorenz, Ryan Lashin ECE Faculty Advisor: Dr. Kent Chamberlin Current Date: 10/30/2009 Project Completion Date: May, 2010

Tesla coil that reproduces sound Solid State Digital Control Design broken into three main parts o Audio detector o Solid state coil driver o Tesla coil General Overview

Part I: Audio Detector Converts audio signal into control signal Researching several different conversion methods Detector needs to be voltage isolated from driver circuit

Part II: Driver Circuit (Control Circuit) Audio detector signal switches MOSFET MOSFET controls current flow through inductive load o High – signal generator drives through inductive load o Low – No current passes through inductive load

Part II: Driver Circuit (Signal Generator) Signal generator – sawtooth waveform o Converts to train of positive impulses Needs to supply high power (200 W-400 W best est.) Needs to convert wall power to usable signal

Part III: Tesla Coil (Coil Design) Essentially giant air-core transformer o Large turns ratio (approximately 10 to 1200) Determines resonant frequency o Driver circuit needs to match resonant freq. Most challenging part to build physically

Part III: Tesla Coil (Output) Output – train of impulses bounded by square envelope o Impulses at resonant frequency Resonant freq. >> audio freq. o Approximates continuous discharge Envelope contains audio information

Timeline

Cost Estimate Cost projectionsSectionComponentsCostTotal Audio detector: Amplifier:$30 Signal modulation components:$20 Voltage isolation: $15 $65 Driver circuit: Power mosfet:.83 cents apiece with 10,000 unit order High voltage signal generator:$200 $200 + ((# of mosfets)*.83) Tesla coil: Wire:$40 PVC pipes:$15 Torroid components:$50 $105 Misc: High voltage capacitors:$300 Misc. electrical parts:$150 $450 TOTAL PRICE:$820 + ((# of mosfets)*.83)

Project is challenging but feasible Components may be expensive, but cost can be offset Power requirements make implementation more difficult o Heat dissipation techniques will be required Personal safety measures will be taken Project is a good representation of the theory we have learned thus far o A chance to practically apply our knowledge Conclusion

Questions?