Now that we understand what the 555 is, and how it operates, it's time to explore what it can be used for.

The 555 has 3 basic modes of operation:

  1. Monostable/one-shot: The trigger input is used to make the output high for some amount of time, after which is goes low until it is triggered again.
  2. Astable/free-running: The output switches between high and low at a specific frequency and duty cycle.
  3. Bistable: The output is controlled by two inputs. This basically just exposes the internal flip-flop.

This guide was first published on Mar 13, 2018. It was last updated on Mar 13, 2018.

This page (Applications) was last updated on Jan 15, 2021.