Lecture 9 Lesson Page - http://www.pyroelectro.com/edu/basics/555_timer/

If the op-amp was a great invention for analog electronics, the 555 timer was the invention of the decade for digital electronics. This lesson will show you why we needed a single device like the 555 timer and how we can use a 555 timer to create a predicatable oscillator using some theory and mathematical equations.

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