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汽车在行驶中改变方向或倒车,需要将方向灯或尾灯开启、闪亮。若装上一个汽车换向音响器,在灯闪亮的同时还能发出音响信号,可以提醒驾驶员在开启方向灯后,不忘记恢复方向开关,还能使行人更加注意。 汽车方向音响器的电路如图所示。S1为汽车原方向灯开关,S2为新加倒车开关。HL1、HL2、HL3分别为汽车左右方向灯与尾灯(或刹车灯),VD1、VD2、VD3是隔离二极管,K为控制继电器,VD4为继电器保护二级管,HA1、HA2是音响器,R1、R2和C以及V1、V2组成开关延时放大器。
When the car changes direction or reverses, you need to turn on or off the direction light or taillight. If fitted with a car reversing sounder, the lights shining at the same time can also send a sound signal to remind the driver to turn on the lights, do not forget to resume the direction of the switch, but also make pedestrians pay more attention. Car direction sounder circuit as shown. S1 for the original car light switch, S2 for the new reversing switch. HL1, HL2 and HL3 are the left and right direction lights and taillights (or brake lights) respectively, VD1, VD2 and VD3 are isolation diodes, K is the control relay, VD4 is the relay protection diode, HA1 and HA2 are sounders, R1, R2 and C and V1, V2 switch delay amplifier.