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+public link-https://www.tinkercad.com/things/gDDdAoHANiJ-magnificent-waasa/editel?sharecode=D0rq9lTsbbO935-sBFrH3FerTkwvC51C23d-xkqQTMM
+
+Explanation:
+
+Initially the circuit without diodes  consists of two resistance R1 and R2 and capacitor C . Then t1(oscillator charge ) is given
+by t1=0.693(R1+R2)C and t2 (capacitor discharge)  by t2=0.693R2C.
+Thereby total time T=t1+t2 and duty=t1/T*100.
+After connecting diode capacitor charges through R1 as R2 is shorted while  during discharge capacitor dischages through R2.
+Thus duty reduces to R1/(R1+R2)
+on choosing R1=R2 duty can be made 50%.
+ 
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