If we forget to turn off the lights in the car or headlights on all night but in the morning you could not even start the car Because batteries lose some voltage, we lets to build the warning forgot off lights circuit better.
As perfect circuit in Figure 1. Use CMOS-IC no-MC14023B. Which is a NAND gate 3 input, Quantity: 3, a small transistor and a Buzzer only.
When rotate the car ignition key switch to stop the engine. If turns off the small headlights and opening the door out of the car, warning buzzer will sound immediately.
As perfect circuit in Figure 1. Use CMOS-IC no-MC14023B. Which is a NAND gate 3 input, Quantity: 3, a small transistor and a Buzzer only.
When rotate the car ignition key switch to stop the engine. If turns off the small headlights and opening the door out of the car, warning buzzer will sound immediately.
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