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I was doing this circuit which I found on the Internet. My question is what is the logic behind the functioning of this circuit? Thanks!

enter image description here

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    \$\begingroup\$ How about a link to wherever you found it? \$\endgroup\$ – JRE Apr 9 at 14:11
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You press the button, it rings the bell and turns on the light for a set amount of time if it's dark outside.

IC2 is almost certainly a 555 timer chip.

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