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555 multi-purpose car alarm circuit

2017-01-18 06:27  
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555 multi-purpose car alarm circuit
As the figure shown, alarm circuit is composed of a 555 and a four 2-input NAND gate circuit. When the oil pressure is too low and the brake pressure is too low, this circuit will issue the warning sound; When the car is steering, this circuit will issue the intermittent sound to tell the driver turn off the turn-light.