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Hi,this time I connected the "flyback diode" as well, but still result was the same. it burnt the IC.
Hello,here are the component details:R1 = 235K (2 470K resistors in parallel)R2/R4/R5 = 1KR3 = 2.2KC1 = 4700μFThis gives me High Time of about 13 min. and Low Time of about 3 seconds.As a test, I also tried one more combination, I replaced both R1 and R1 with 1K resisters keeping the capacitor the same, this gave me a High Time of about 7 seconds and Low Time of about 3.5 seconds. and then even if I connect the Relay directly between +Vcc and Pin-3 of the IC, it works fine without any issue.But if I increase the delay, it breaks the IC.