The 555 timer in astable mode can make an LED flash on and off at a pre-determined frequency. It can also be used to generate tones of different frequencies when connected to a passive buzzer. In this video, we will set up the 555 timer in astable mode and make an LED flash with an adjustable rate.
The 555 timer can be purchased on Amazon here:
https://amzn.to/3XgnuDZ
The full tutorial with wiring diagrams and schematics is here: https://www.circuitbasics.com/555-timer-basics-astable-mode/
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