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The car brake lamp fault monitor (2)

2015-02-03 01:46  
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The car brake lamp fault monitor (2)
The working principle of the circuit (2)The car brake lamp fault monitor consists of resistors R1-R3, diodes VD1 and VD2, NOR gate integrated circuit IC(Dl-D4), LED VL1 and VL2, see as figure 7-54. S is the car brake lamp switch, HL1 and HL2 are both the car brake lamps.Before the pedal is stepped down, S is in the breakdown state, both VD1 and VD2 are blocked, Nor gates D1 and D3 are both outputting high LEV, both D2 and D4 are outputting low LEV, neither of VL1 and VL2 is glowing.