Transcript Slide 1
EEET0462 Electronics Project Management And Design Step Four : Execution สุ ริยา วิทยาประดิษฐ์ [email protected] Mobile : 089-788-6242 Design execution Copyright © S.Witthayapradit 2010 Design execution Copyright © S.Witthayapradit 2010 Preliminary Design (Pre-Design) [Technology Selection] Component Selection [Electrical Characteristics & Volume & Cost] Schematic or Electrical Circuit [Standard Circuit & Simulate] Prototype Development [Bread Board & Universal PCB , PCB Assembly] Manufacturing & Mock up [Soldering & Model(Sketchup or solidwork ] Preliminary Design “Technology Selection” Copyright © S.Witthayapradit 2010 Plate-Through Hole Technology(PTH) Surface-Mount Technology(SMT) PTH & SMT Mixed Preliminary Design “Technology Selection : Total Cost (1)” Copyright © S.Witthayapradit 2010 Budget Production Volume Preliminary Design “Technology Selection : Total Cost (2)” Copyright © S.Witthayapradit 2010 Cost Analysis spreadsheet Price per Item Description Total Cost per Quantity 1 100 1000 1 100 1000 1 PCB Assembly 1 59.50 41.63 35.03 59.50 41.63 35.03 2 Enclosure 1 11.50 10.85 9.85 11.50 10.85 9.85 3 Front Panel Label 1 1.85 1.76 1.55 1.85 1.76 1.55 4 Total Assembly & Test 1 40.00 40.00 40.00 40.00 40.00 40.00 112.85 94.24 86.43 Component Selection “Assembly” Copyright © S.Witthayapradit 2010 Axial SMD 3W 2W 1W W 1/2 W 1/4 W 1/8 Component Selection “Type and Power Rating” Copyright © S.Witthayapradit 2010 Cost Factor X = 0.02 Resistor Type Tolerance Power Rating Carbon film +/- 5% to +/10% 1/8 , 1/4 , 1/2 , 1W , 2W 1X Metal film +/- 1% 1/8 , 1/4 , 1/2 W 2X Precision Metal Oxide +/- 1% to +/- 2% 1/2 , 1/4 W 4X Power Metal Oxide +/- 5% 1/2 to 3W 15X Wire wound +/- 1% 1 to 50W 100X Component Selection “Tolerance & Cost” Copyright © S.Witthayapradit 2010 Component Selection “Capacitors” Copyright © S.Witthayapradit 2010 Chip Capacitors Capacitors Component Selection “Capacitor Selection” Copyright © S.Witthayapradit 2010 Dielectric Working Voltage Frequency Range Size Cost Ceramic 25 to 30kV High Small Low Mica 50 to 50kV High Medium Low Polyester 30 to 10kV Low to Medium Medium to large Medium to High Polycarbonate 30 to 10kV Low to Medium Medium to large Medium to High Polystyrene 30 to 10kV Low to Medium Medium to large Medium to High Polypropylene 30 to 10kV Low to Medium Large Medium to High Polyethylene 30 to 10kV Low Medium to large Medium to High Mylar 30 to 10kV Low to Medium Medium Medium Electrolyte 10 to 500 Low Capacitance to size ratio Low Tantalum 10 to 35 Low Small Low D.Joseph Stadtmiller , “Electronics Project Management and Design” , P’198 -199 , Prentice-Hall , 2001. Component Selection “Integrated Circuit” Copyright © S.Witthayapradit 2010 Summary : Component Selection Copyright © S.Witthayapradit 2010 คณ ุ สมบัติทางไฟฟ้ า(Electrical Characteristics) Power Rating , Working Voltage , Frequency – Range , Temperature , Tolerance รูปร่ าง(Package) การผลิต(Production) ราคา(Price) ปริมาณ(volume) Prototype Development “Bread Board or Proto-Type Board” Copyright © S.Witthayapradit 2010 VCC . O/P uA741 VCC I/P R2 VEE U1 2 - V+ R1 OS2 1k 3 + V- OUT OS1 uA741 4 I/P 7 10k 0 VEE GND 5 O/P 6 1 Prototype Development “Universal PCB & Adaptor PCB” Copyright © S.Witthayapradit 2010 VCC Universal PCB R2 VCC 10k 2 - O/P 7 U1 V+ R1 OS2 1k 3 + V- OUT OS1 5 uA741 O/P 6 1 I/P GND uA741 VEE GND 4 I/P 0 VEE VCC O/P I/P Adaptor PCB VEE GND Printed Circuit Board Design Copyright © S.Witthayapradit 2010 0.105 Inch2 0.15 Inch2 0.375 Inch2 SMT(sot-23) SMT(so-8) Through hole(DIP) Resistor 2.00 2.00 0.40 IC 10.00 10.00 5.00 PCB(30B/inch2) 3.15 4.50 11.25 Total Cost 15.15 16.50 16.65 *** ราคาโดยประมาณและไม่ คานวณต้ นทุนการผลิต Manufacturing & Mock Up “Soldering” Copyright © S.Witthayapradit 2010 Hand Soldering Machine - wave soldering - Reflow Soldering - Laser Soldering - Infrared Soldering Manufacturing & Mock Up “Soldering Video” Copyright © S.Witthayapradit 2010 wave soldering Reflow Soldering Laser Soldering Infrared Soldering Manufacturing & Mock Up “Model” Copyright © S.Witthayapradit 2010 “Altium Design” Manufacturing & Mock Up “Model” Copyright © S.Witthayapradit 2010 “SolidWork” “Google SketchUp” EEET0462 Electronics Project Management And Design Step Four : Execution จบบรรยาย คำถำม และ คำตอบ References:D.Joseph Stadtmiller , “Electronics Project Management and Design” , Prentice-Hall , 2001.