LED Roulette - https://circuitdigest.com/electronic-circuits/555-timer-roulette-circuit

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10 top 555 timer IC:

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Dark Sensor 

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Servo Tester

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Tone Generator 

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Water Level Indicator 

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Electronic Piano

 

Electronic Dice 

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Line-Follower Robot 

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Clap Switch Circuit Using IC 555 Timer & Without Timer - https://www.electricaltechnology.org/2014/10/clap-switch-circuit-electronic-project.html

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555 Pocket Keyboard - https://www.instructables.com/id/555-Pocket-Keyboard/

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Blinking LED with Timer circuit 555 - https://youtu.be/yBVGU02rlAg

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Timer IC 555 Dual Blinking and flashing - https://youtu.be/pwNjKc5L0zk

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How to make 32 LEDs flash with a 555 IC timer - https://youtu.be/c_MVvt-Epec​