Please explain how this ckt works

[jitun2]

Here im posting the schematic of a pulse width modulator dircuit using 555 timer IC.I have seen the output in a CRO it Comes fine.Now can someone please explain how does this works.

 

[hotwaterwizard]

Check these websites.

**broken link removed**

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http://www.cpemma.co.uk/pwm.html

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[mramos1]

Here im posting the schematic of a pulse width modulator dircuit using 555 timer IC.I have seen the output in a CRO it Comes fine.Now can someone please explain how does this works.

I think the first link from hotwaterwizard sort of takes you to the site it came from. I do not normally make my chips pink in color.

**broken link removed**

Search for "555 PWM circuit on google".