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Motor vehicle steering flasher 12

2016-09-01 06:25  
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Motor vehicle steering flasher 12
The motor vehicle steering flasher described in the example uses high-power transistors as electronic switches, the circuit is simple, easy to make. The working principle The motor vehicle steering flasher is composed of the flash circuit resistors R1-R3. Capacitor C, diode VD, transistors V1, V2, it is shown in Figure 7-21. S is the vehicle turn signal switch; HLl and HL2 are the left turn signal and right turn signal respectively. Before turning signal switch S (in the center), the oscillator circuit composed of vl, v2, and external RC components does not work. Placing S in the L or R position, the oscillation circuit works, V2 makes intermittent conduction with a certain frequency , Ll or HL2 is flashing. Component selection RI-R3 selects 1/4W carbon film resistor or metal film resistors. C uses 25V electrolytic capacitors. VD uses lN5402 silicon rectifier diode. VI selects 3DGl2 or S8050 silicon NPN transistor; V2 uses 3AD30 germanium PNP transistors.