Hi, I connected the 555 timer as shown in breadboard below. It didn't turn off after 8 secs as calculated. I tested the 555 IC in astable mode and the green LED blinked on and off. I have also rechecked all the pins, orientation of 555 IC and connections but can't find the problem. Could you spot any issues with my design or wiring? Any suggestions to troubleshoot the circuit? Thanks for your help.
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