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How can i get 50% duty cycles?enter image description here

Vincci
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    Funnily enough the linked "duplicate" doesn't have the classic answer, which is Andy's second circuit, which works very well if the output isn't heavily loaded. –  Oct 24 '16 at 09:13
  • Is there other methods to do it? can i change the resistor value or capacitor? – Vincci Oct 24 '16 at 09:20

1 Answers1

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Try this: -

enter image description here

R1 dictates charge time of C1 and R2 dictates the discharge time.

Or this: -

enter image description here

Taken from here

Alternatively put a d type flip-flop on the output to divide the frequency by two and deliver a very good 50% duty cycle.

Andy aka
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  • Is there other methods to do it? For example by changing the resistor value or capacitor value? – Vincci Oct 24 '16 at 09:21
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    You cannot ever achieve a perfect 50% duty cycle with the standard circuit because charging the capacitor is done via two resistors whilst discharge is done via one resistor so, duty can be nearly 50% to nearly 100% with the standard circuit no matter how hard you try to change any value. – Andy aka Oct 24 '16 at 09:26