We present a circuit for those who want to give the impression that there are people at home when they are away. A lamp that will light up every half hour is activated, and this time is adjusted through the trimpot. By turning on the outputs at the base of the transistors, which are connected to a NAND port, the circuit will start when the outputs of 555 and mpinos12 of 4017 are all at the high level. To stay on for 3 minutes, do not connect the 555 output to the NAND port, but on the positive side of the supply.
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