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# 555 bumper cars circuit

2015-01-31 03:51
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IC adopts ambipolar time base circuit 555, its load current can reach 200mA, it can drive toy motor directly. K1, K2 are toggle switch, when the car moves, K1, K2 are closed, due to 2 foot is high level, 3 foot is low level, the motor terminal's voltage is about 3V(the left is negative, the right is positive), the motor is positive turning, the car moves forward; when the car meets the object, the humper K is butted, 2 foot is connected to ground, the circuit is set, the output turns to high level(about 6V), the motor terminal's voltage is still 3V, but the motor is negative turning, the car gets back. Due to the action of car's reverse wheel, it is moving back and turning. After the circuit is set, C1 is charged by R1, when C1's voltage is charged to more than 6 foot's threshold level 2/3 VDD=2/3(E1+E2)=4V, then the monostable circuit's temporal stability is ended, the car recovers to the former state and moves forward again.

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