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  1. 555 Timer Pinout - Learning about Electronics

  2. 555 Timer Tutorial: How It Works and Useful Example Circuits

  3. 555 timer IC - Wikipedia

  4. Comprehensive Guide to 555 Timer with Pinout, Specs

  5. IC 555 Pin Description and Working [with Formulas]

  6. 555 Timer IC Pinout, Diagrams, Features, Operating Modes, …

  7. Guide to 555 Timer Pinout, Specs and Operating modes

  8. 555 Timer IC – Working Principle, Block Diagram, Circuit Schematics

  9. 555 Timer Tutorial - How To Configure a 555 Timer IC - Jameco …