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Cotter Pin Assortment 555 PC Heavy Duty Zinc-Plating Steel Pins for Automotive, Mechanics, Car Garage, Workshop, Power Equipment, Cars, Trucks, Lawn Mower, Small Engine Repair, & Fastening - By Katzco: Home Improvement - Amazon.com
555 Timer IC Working, Pin Diagram, Examples (Astable, Monostable, Bistable)
Electronics Components: How the 555 Timer Chip Works - dummies
Amazon.com: The Ultimate Beginner's Guide to the 555 Timer: Build the Atari Punk Console and Other Breadboard Electronics Projects (9781520148038): Rutherford, Jesse: Books