This electronics video tutorial explains how to make a LED blinking circuit using the 555 timer IC. R1 and C1 controls the frequency of the circuit and therefore the flash rate of the light emitting diode. R1 and R2 controls the duty cycle which determines the percentage of time the LED will be ON compared to when it's OFF.

LED Flasher Circuit:
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RC Phase Shift Oscillator Circuit:
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Wien Bridge Oscillator Circuit:
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Colpitts Oscillator Transistor Circuit:
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Hartley Oscillator Circuit:
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Single Transistor Esaki Oscillator Circuit:
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Single Transistor LED Flasher Circuit:
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What Is Negative Resistance?
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Colpitts Crystal Oscillator Circuit:
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Pierce Crystal Oscillator Circuit:
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555 Timer - Pulse Generator Circuit:
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Voltage Controlled Oscillator Circuit:
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60 Hz Sine Wave Generator - 555 Timer:
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555 Timer Signal Generators:
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Final Exams and Video Playlists:
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Full-Length Videos and Worksheets:
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555 Timer:
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