ECE 431 Radio Enclosure ECE 431 Radio Enclosure Design ProjectDesign Project

Vladimir GoncharoffVladimir Goncharoff

IntroductionIntroduction

ECE 431 – Analog ECE 431 – Analog Communication CircuitsCommunication Circuits

(RF Circuit Design)(RF Circuit Design)

Laboratory Project:Laboratory Project:

AM Broadcast Band ReceiverAM Broadcast Band Receiver (500-1700 KHz) (500-1700 KHz) Manual and Digital TuningManual and Digital Tuning Every student builds a radioEvery student builds a radio Prototyping-style construction methodPrototyping-style construction method

Manhattan-style construction:Manhattan-style construction:

Design Problem:Design Problem:

There is too little space on the There is too little space on the existing copper-clad board to allow existing copper-clad board to allow for expansion and experimentationfor expansion and experimentation

Solution Approach:Solution Approach:

Redesign the radio enclosure to Redesign the radio enclosure to accommodate a larger circuit board accommodate a larger circuit board (or boards)(or boards)

ResearchResearch Identify needs and wantsIdentify needs and wants Survey prospective customersSurvey prospective customers Study existing designsStudy existing designs Brainstorm design alternativesBrainstorm design alternatives

Desired Enclosure FeaturesDesired Enclosure Features

Increased circuit board area than the existing designIncreased circuit board area than the existing design Easy to manufactureEasy to manufacture Low materials costLow materials cost Helps with constructing and testing the radio circuitsHelps with constructing and testing the radio circuits Low EMI with the outside worldLow EMI with the outside world Low EMI between different sections of the radioLow EMI between different sections of the radio Aesthetically pleasing appearanceAesthetically pleasing appearance SturdySturdy

Existing Radio Enclosure DesignExisting Radio Enclosure Design

Possible Improved Enclosure DesignsPossible Improved Enclosure DesignsCross-Section SketchesCross-Section Sketches

Design Alternative #1Design Alternative #1

6” x 12” single-sided board

Design Alternative #2Design Alternative #2

5” x 6” double-sided board

Design Alternative #3Design Alternative #3

Two 5” x 6” single-sided boards

Design Alternative #4Design Alternative #4

Two 5” x 6” single-sided boards

Design Decision MatrixDesign Decision Matrix

Criterion Weighting Factor

Design #1Rating

Design #2

Rating

Design #3

Rating

Design #4

Rating

a 9 10 5 8 10

b 7 4($5.00)

10($2.45)

8($3.20)

8($3.20)

c 3 5(130 in2)

6(110 in2)

8(80 in2)

10(50 in2)

d 10 10(+18 in2)

5(+8 in2)

5(+8 in2)

5(+8 in2)

e 8 10 3 7 9

f 3 7 5 8 10

g 5 8 10 10 6

h 8 10 3 7 9

i 8 5 10 7 7

j 6 8 10 7 4

WeightedSum:

542 436 486 510

Design Alternative #1 is “best”Design Alternative #1 is “best”

3-D Models of the Final Design3-D Models of the Final Design

3-D Models of the Final Design3-D Models of the Final Design

Dimensioned Drawings:Dimensioned Drawings:Assembly ViewAssembly View

Exploded Assembly View with Parts ListExploded Assembly View with Parts List

Dimensioned Individual Part DrawingsDimensioned Individual Part Drawings

Assembly InstructionsAssembly Instructions

Putting together the 9x12 enclosure v2.wmvPutting together the 9x12 enclosure v2.wmv

the endthe end