555 Astable Multivibrator

T(on)= 0.693(R1+R2)C1 T(off)=0.693(R2)C1 f=1/T duty= T(on)/T(total) x 100 C2 is 0.01uF app:-Built-up circuit on a breadboard, 0-30 DC supply, multimeter, CRO up 8,4 LHS= 7 near 8, 2 and 6 just corner besides RHS= 3,5 equally divided bottom= 1 at first half square the circuit 8 and 4 to the extreme 10v R1 in between 8,7 verticle R2 in between 7,2 verticle C1 in between 6,1 verticle C2 in between 5,1 verticle