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Google "555 astable multivibrator" and look at a few of the websites you get back. There are MANY that talk about how the circuit works... all the way down to the nitty-gritty details about the level comparisons and current mirrors inside the 555 IC.
555 timer is a clock provider, in fact n oscillator. it generates a constant square wave, its frequency and time period can b set through the attached RC circuit. the valus of R, C can b set through farmulae including duty cycle.
In its design its is an 8 Pin IC
you can have a useful view of
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