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FM CONVERTER

FM CONVERTER. Team Members. Dan Harkins. Beau Blackwell. Dr. Georgios Lazarou Advisor. Shawn Welch. George Henry Team Leader. Daniel Lack. Team Responsibilities. Implementation. Block Diagram. LCD. Pre-Emphasis. Modulator. Amplifier. Modulator. LCD. Pre-Emphasis. Modulator.

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FM CONVERTER

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  1. FM CONVERTER

  2. Team Members Dan Harkins Beau Blackwell Dr. Georgios Lazarou Advisor Shawn Welch George Henry Team Leader DanielLack

  3. Team Responsibilities

  4. Implementation

  5. Block Diagram LCD Pre-Emphasis Modulator Amplifier

  6. Modulator LCD Pre-Emphasis Modulator Amplifier

  7. Modulator • Design Requirements: • Tunable • FM Radio Quality

  8. Modulator • Design Requirements: • Tunable • FM Radio Quality • Alternate topologies

  9. Alternate Modulator Topologies Direct FM Modulation of a Crystal Oscillator

  10. Modulator • Design Requirements: • Tunable • Radio SNR • Alternate topologies • Carrier Signal

  11. Modulator • Design Requirements: • Tunable • Radio SNR • Alternate topologies • Carrier Signal • Inductor choice

  12. Modulator • Capacitor choice • Frequency range (88.1-88.5)

  13. FCC Separation Standards Courtesy of: http://www.fcc.gov/mmb/asd/spacing/73207.html

  14. Pre-Emphasis LCD Pre-Emphasis Modulator Amplifier

  15. Pre-Emphasis • Requirements: • Process standard audio input for modulator • Voltage regulation • Filter

  16. Simulation of Pre-Emphasis Input 1 Output Input 2

  17. Pre-Emphasis Hardware Results P-Spice Simulation Hardware Results

  18. Amplifier LCD Pre-Emphasis Modulator Amplifier

  19. Amplifier • Requirements • FCC regulations • Signal amplification • Preparation for transmission

  20. Converter Schematic

  21. Converter Schematic Pre-Emphasis

  22. Converter Schematic Modulator

  23. Converter Schematic Amplifier

  24. Converter Schematic

  25. Display Network Schematic • Driven by PIC16F84 • Displays operating frequency to user • Prompts user to set radio • Largest power consumption Digital Interface

  26. PCB Layout Fabricated by Express PCB

  27. Input vs. Output CH A: Audio Input CH B: Audio Output Tone FM Signal

  28. Input vs. Output Input Output 5kHz 10kHz 15kHz

  29. Goals vs. Results

  30. Cost

  31. Goals vs. Results

  32. Goals vs. Results

  33. Power and Battery Life • Uses 4 AA batteries • Current: • With LCD backlit: 118mA • Normal operation: 28mA • Battery life: • Worst case (LCD on constantly): ~ 89 hours (3.7 days) • Best case (LCD on ~0%): ~ 407 hours (17 days) • Normal use (LCD on 2%): ~ 382 hours (16 days) Courtesy of: http://data.energizer.com

  34. Goals vs. Results

  35. Goals vs. Results

  36. 3.5 inches Packaged Product Depth = 1.5 inches Volume = 36.75 in3 7 inches

  37. Goals vs. Results

  38. Goals vs. Results

  39. Goals vs. Results

  40. Goals vs. Results (cont.)

  41. Developments • Stereo development • BA1404

  42. Acknowledgments Thank you: • Dr. Lazarou • Dr. Picone

  43. DEMO

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