Electronic*circuit*design*and*component*selec2on*
Nan$Wei(Gong(
MIT(Media(Lab(
MAS.S63:(Design(for(DIY(Manufacturing(
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Electronic Circuit Design and Component Selection: A Guide for DIY Manufacturing, Study Guides, Projects, Research of Electronics
Electronic circuit design comprises the analysis and synthesis of electronic circuits. Contents. [hide]. 1 Methods. 1.1 Network simulation software. 1.1.1 Linearization around operating point; 1.1.2 Piece-wise linear approximation. 1.2 Synthesis. 2 See also. Methods[edit]. To design any electrical circuit, either analog or digital.
Typology: Study Guides, Projects, Research
2017/2018
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Electronic circuit design and component selec2on
Nan-‐Wei Gong
MIT Media Lab
MAS.S63: Design for DIY Manufacturing
Goal for today’s lecture
• How to pick up components for your project
• Rule of thumb for PCB design
• SuggesMons for PCB layout and manufacturing
• Soldering and de-‐soldering basics
• Small -‐ medium quanMty electronics project producMon
• Homework :
Design a PCB for your project with a BOM (bill of
materials) and esMmate the cost for making 10 | 50 |
(PCB manufacturing + assembly + components)
Design Process
Test Circuit
Module
Selec2on
PCB Design
Component
Placement
PCB
Manufacturing
Design Process
- Test circuit – bread boarding/ buy development tools (breakout boards) / simulaMon
- Component Selec2on – spec / size / availability (inventory! Need 10% more parts for pick and place machine)
- PCB Design – power/ground, signal traces, trace width, test points / extra via, pads / mount holes, big before small
- PCB Manufacturing – price-‐Mme trade-‐off/
- Place Components – first step (check power/ground) -‐-‐ work flow
Development Boards
- good reference for circuit design and component selec2on SomeMmes, it can be cheaper to pair your design with a development board for your “product” if you are only manufacturing in a small quanMty..
Simulate you (analog) circuit if needed!
hap://www.ecircuitcenter.com/ haps://www.circuitlab.com/ hap://phet.colorado.edu/en/simulaMon/ hap://www.openmusiclabs.com/testpage/ hap://www.daycounter.com/ …and more!
Electronic Components Distributor
Components
Wire Selec2on
- WIRE GAUGE – AWG (American wire gauge)
- the diameters of round, solid, nonferrous, electrically conducMng wire. The
cross-‐secMonal area of each gauge is an important factor for determining its
current-‐carrying capacity.
- JACKET (InsulaMon)
- The jacket physically protects the internal components of a cable,
improves the cable’s appearance and provides flame retardancy –
Protects from the environment–Protects from the rigors of installaMon
hap://www.belden.com/docs/upload/InsulaMons-‐Jackets.pdf
Jumpers between chips
30 AWG solid wire
Antenna for Zigbee Radio
¼ wavelength solid 23 AWG wire
Connector for flexible
flat cable (for
programmer)
hap://search.digikey.com/scripts/DkSearch/dksus.dll? x=0&y=0&lang=en&site=us&KeyWords=switch
DIP switch TacMle buaon
SPST switch
SPDT switch
Switches -‐ mechanical or actuators
BaYery NiCad NiMH Lead Acid Li-‐Ion Li-‐Polymer Rechargeable Alkaline Gravimetric Energy Density (Wh/kg) 45 -‐ 80 60 -‐ 120 30 -‐ 50 110 -‐ 160 100 -‐ 150 80 (iniMal) Internal Resistance (mΩ) (includes peripheral circuits)
6V pack
6V pack
12V pack
7.2V pack
7.2V pack
6V pack Cycle Life (to 80% of iniMal capacity) 1500 300 -‐ 500 200 -‐ 300 500 -‐ 1000 300 -‐ 500
(to 50%) Self-‐discharge / Month (room temp) 20% 30% 5% 10% 10% 0.3% Cell Voltage (nominal)
1.25V 1.25V 2V 3.6V 3.6V 1.5V
Load Current -‐ peak -‐ best result*
20C
1C
5C
0.5C or less
5C
0.2C
>20C
5C or less
>20C
5C or less
0.5C
0.2C or less Opera2ng Temperature -‐40 -‐ 60°C -‐20 -‐ 60°C -‐20 -‐ 60°C -‐20 -‐ 60°C 0 -‐ 60°C 0 -‐ 65°C Maintenance Requirement 30 -‐ 60 days 60 -‐ 90 days 3 -‐ 6 months not req. not req. not req.
hap://www.rfcafe.com/references/electrical/baaeries.htm
Three basic things -‐ Cell Voltage, Load Current, Amp-‐Hour (symbol Ah, AHr, A·∙h, A h)
Footprint -‐ same component / IC comes in different footprints
hap://en.wikipedia.org/wiki/File:Cap-‐elko-‐smd-‐polarity.jpg
Capacitors Voltage raMng for capacitors –
Really important for power circuits
hap://www.bcae1.com/capacitr.htm
Footprint -‐ same IC comes in different footprints
Courtesy of Analog Device’s poster
SMD (surface-‐mount device) ICs
hap://www.topline.tv/SMDnomen.pdf