Audio FM Link Audio FM Link Blue TeamBlue Team

Justin Cobbett

Elizabeth Cullinan

Usman Hashmi

Matthew Peck

Joshua Smith

Audio FM Link (AFeL)Audio FM Link (AFeL)

What is it?– PC-Controlled FM broadcasting unit.

What does it do?– Allows user to transmit digital audio from their

home PC to any home FM band receivers.

Who could use the AFeL?– Anyone who wants more flexibility in listening

to their PC audio files (e.g. MP3’s, RealAudio)

System SketchSystem Sketch

AFeL FeaturesAFeL Features

Contains transmitter to broadcast FM signal Contains receiver to scan for an available

frequency PC connections

– USB port– Audio cable

PC software for broadcast control Audio playback via existing audio software

(e.g. WinAmp, RealPlayer)

Block DiagramBlock Diagram

System HardwareSystem Hardware

Ramsey Electronics FM-10 Transmitter KitPhillips TDA7000 FM Radio CircuitMicrochip PIC 16C745EMI Shielded Case

FM-10 Transmitter KitFM-10 Transmitter Kit

FM Radio CircuitFM Radio Circuit

PIC MicrocontrollerPIC Microcontroller

PIC 16C745– Offers built-in USB support– Inexpensive– Easy project development– Multifunctional

SoftwareSoftware

Visual User Interface– Visual Basic

Functionality– Automatic Scan– Manual Scan– Frequency Display

Welcome ScreenWelcome Screen

Input Frequency WindowInput Frequency Window

Error MessageError Message

AFeL Control WindowAFeL Control Window

SpecificationsSpecifications Nominal transmission range of 100 ft. radius.

– 31415 ft2 transmission area

Able to transmit on licensed FM (88.1-107.9). Uses standard electric outlet. Weight limit of 2lbs. Size limit of 8”L x 8”W x 2”H. Software compatibility with Windows 95/98. USB interface between PC and AFeL unit. Audio signal from sound card.

FCC RegulationsFCC Regulations

Maximum output of 100 mW for non-licensed FM transmitters

Maximum range of ¼ mileCase must provide shielding to block EMI

DeliverablesDeliverables

1.1. The AFeL UnitThe AFeL Unit

2.2. 6 foot USB cable6 foot USB cable

3.3. 6 foot audio cable6 foot audio cable

4.4. 12 volt regulated AC wall transformer12 volt regulated AC wall transformer

5.5. Disc containing softwareDisc containing software

6.6. Complete User ManualComplete User Manual

7.7. Complete Service ManualComplete Service Manual

Project BudgetProject Budget 1.      Power Supply $15.002.      Transmitter Kit $35.003.      PIC chip $10.004.      Receiver Chip $ 5.005.      USB cable $ 4.006.      Audio Cable $ 5.007.      Casing Material $15.008.      Other electronic components $20.009.      Miscellaneous $10.00  

TOTAL $119.00

QuestionsQuestions