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BCD Clock

BCD Clock. Charles Burger, Nick Hiatt, Setrak Kerjilian, Tom Neish Broome Community College Binghamton, New York EET 252 Design & Fabrication Spring 2001. Project Goals. Computer Driven Binary Clock Marketable Small, Attractive Product Low Cost Production.

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BCD Clock

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  1. BCD Clock Charles Burger, Nick Hiatt, Setrak Kerjilian, Tom Neish Broome Community College Binghamton, New York EET 252 Design & Fabrication Spring 2001

  2. Project Goals • Computer Driven Binary Clock • Marketable • Small, Attractive Product • Low Cost Production

  3. Heart of the Circuit - 74LS595 IC 8 Bit Shift Register with Output Latches • 8 Shift Registers • 8 Latches

  4. Heart of the Circuit - 74LS595 IC Shift Registers • Row of cascaded flip-flops (21 bits required) • Serial Input • Parallel Output to Latches • Shifted by Clock

  5. Heart of the Circuit - 74LS595 IC • Latches • Sustains high or low value from Shift Register • Triggered by RCK Input • Outputs and Drives LED’s

  6. Other Electrical Components • Resistors • Purpose: To act as Current Limiting Device • Light Emitting Diodes • Visual Output Display

  7. Circuit Design • Circuit Design • One Chip for each digit (hrs., min., sec.) • Off-board Connector Location • Minimize Traces • Minimize PCB size

  8. Circuit Design • Breadboard Circuit Check Why Breadboard First?

  9. Printed Circuit Board Design • Design Rules • Trace and Pad Spacing • Dead Space • Component Spacing • Placement of Components

  10. 1

  11. 2

  12. Pre-Fabrication Requirements • Circuit Check • Parts List • Jumper Pin-Out • Drill Plan

  13. Pre-Fabrication Requirements Circuit Check • Why do a Circuit Check? • Ensure that Schematic and PCB Design match electrically. • Future Troubleshooting Aid

  14. Pre-Fabrication Requirements Parts List • Cost Assessment • Manufacture Preparation • Repair Information

  15. Pre-Fabrication Requirements Jumper Pin-Out • Assembly Aid • Troubleshooting Aid

  16. Pre-Fabrication Requirements Drill Plan Assembly Aid • Necessary Hardware • Drilling Location

  17. Fabrication • Fabrication of Printed Circuit Board • Fabrication of Chassis • Fabrication of Cover

  18. Mylar PhotoResist Mylar and Copper Exposed to UV Light Heat Treatment Removal of Exposed Photo Resist Etching of PCB Removed Remaining PhotoResist Drilled Holes Tinned Traces Trimmed PCB Filed Edges LED Spacer Fabrication of PCB

  19. Fabrication of PCB • Insertion and Fitting of Components • Lead Soldering • De-Fluxing • Functionality Test

  20. Fabrication of Chassis • Chose Appropriate Size Aluminum Box • Drilled Holes for DB-9, PBC Mounts, and Cover • Applied Paint

  21. Fabrication of Cover • Choice of Cover • Aesthetically Pleasing • Colorful • Testing of Cover • Manufacture • Cut plexiglass to size • Drilled holes for LEDs • Drilled Mounting Holes • Engraved Lettering

  22. Finally…

  23. Special Thanks To: Don McCarty Mr. Antanakos and of course, Mr. DiGiacomo Mr. De Voe

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