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  1. 555 Timer Tutorial: How It Works and Useful Example Circuits

  2. 555 Timer Circuits

  3. 555 Timer Tutorial - The Monostable Multivibrator

  4. 555 timer IC - Wikipedia

  5. 555 circuits using the 555 Timer as an Astable Oscillator

  6. 555 Timer IC – Working Principle, Block Diagram, Circuit

  7. Introduction to the 555 Timer - Circuit Basics

  8. 555 Timer Circuits and Projects - 25+ Simple and Advanced 555

  9. 555 Timer - Electronics Reference

  10. 555 Timer IC – Block Diagram, Working, Operating Modes