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Wireless Earphones

Wireless Earphones. Avionne Maurice & Jacqueline Suarez Advisors: Prof. Hassib & Hedrick March 5, 2005. Why Wireless Earphones? Project Description Similar Products Original Project Specifications Actual Project Specifications Components. Transmitters Receivers

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Wireless Earphones

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  1. Wireless Earphones Avionne Maurice & Jacqueline Suarez Advisors: Prof. Hassib & Hedrick March 5, 2005

  2. Why Wireless Earphones? Project Description Similar Products Original Project Specifications Actual Project Specifications Components Transmitters Receivers Block Diagram Implementation Results References Questions OUTLINE

  3. WHY WIRELESS EARPHONES? • Wanted to develop a device which hasn’t been explored thoroughly in the wireless field • Increase our knowledge in wireless and RF (radio frequency) technology • Construct a device which would be useful and fun to use

  4. PROJECT DESCRIPTION • Wireless earphones are lightweight ear-clip stereo headphones made by Maxell. • The earphones will be used in conjunction with a portable audio player. • Increased range of listening.

  5. SIMILAR PRODUCTS GBA-SP Wireless Earphone • Built-in FM Radio • Transmitter requires no batteries. • Earphone receiver runs only on 2 AAA batteries. • The right earphone serves as the control center. • The left earphone houses the battery compartment.

  6. SIMILAR PRODUCTS Acoustic Research 900MHz Wireless Stereo Headphones • Headphones work with audio or video devices, like TVs, DVD players, computers, etc. • Transmission range about 300 feet. • Rechargeable batteries • Transmitter is bulky • Headphone vs. Earphone

  7. ORIGINAL PROJECT SPECIFICATIONS • Suppression of unwanted signals at 45 dB minimum • FM modulation • Battery Life: 8 hours minimum • Receiver: Ear bud size • Transmission Range: 300 ft minimum

  8. ACTUAL PROJECT SPECIFICATIONS • Suppression of unwanted signals at 40 dB • FM modulation • Battery Life of Receiver: 25 hours • Battery Life of Transmitter: 25 hours • Receiver: Ear-clip size • Transmission Range: 200 ft

  9. COMPONENTS • RF transmitter • RF receiver • Battery • Earphones • Antenna

  10. OLD TRANSMITTERS • Originally we had 3 different transmitters from which to choose. • Each transmitter had a wide supply voltage, long transmission range, and average in cost. RTF3-433   FM RF Transmitter Module Quasi AM/FM RF Transmitter Module TXM-xxx-A/F   FM RF Transmitter Module

  11. OLD RECEIVERS • Initially there were two receivers to match the three transmitters. • Fairly expensive – about $50.00 • Dimensions weren’t very small SILRX-xxx-A/F   FM SuperHeterodyne Receiver Module QMR1-433   Quasi AM/FM Receiver Module

  12. NEW TRANSMITTER FMST-100 STEREO TRANSMITTER • Tunable from 76-108MHz • Compatible with any audio device, like a CD player or tape deck • Uses a BA1404 IC chip • Transmission range is 200 feet • With 9 V battery, has a battery life of 25 hours • Price: $29.95

  13. NEW RECEIVER TDA7000 FM Radio Receiver • Supply voltage range: 2.7 to 10 V • Supply current: typical 8 mA • Frequency range: 1.5 to 110 MHz • Sensitivity: 1.5 mV • With 3 V battery, has a battery life of 25 hours • Price: $15.95

  14. BLOCK DIAGRAM IMPLEMENTATION • A CD player was used for the input signal. • The audio signal was then received by the FMST-100 stereo transmitter. • Within the FMST-100 stereo transmitter the signal is amplified and modulated by the BA1404 IC chip. • The signal is then transmitted and received using the antennas. • Inside the TDA7000 FM Radio Receiver chip, the signal is demodulated and amplified so it can be heard with the wireless earphones.

  15. RESULTS • Transmitter is functional • Debugging completed for transmitter • In the process of debugging receiver

  16. Mount transmitter in box • Increase stability of transmitter • Design an antenna system

  17. REFRENCES • www.bestbuy.com • www.jameco.com • http://www.semiconductors.philips.com • http://www.users.bigpond.com/cool386/tda7000/tda7000.html • http://www.microbattery.com/Toshiba%20Webpages/lithium%20coin%20new.htm • http://www.semiconductors.philips.com/pip/TDA7000.html

  18. SPECIAL THANKS TO Gene Davison Professor James Hedrick Professor Ekram Hassib

  19. QUESTIONS?

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