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Car flashing light controller circuit

This example describes flashing lights motor controller can be installed in the motorcycle or car kit rear glass rear window , driving at night when the lights flicker back and forth to produce a one-way flow or flashing light effect, very eye-catching .

Circuit works

The controller circuit consists of a motor vehicle flashing lamp and LED driver circuit oscillator , as shown in Figure .

Oscillator circuit consists of operational amplifier integrated circuit ICl (Nl-N4) within the Nl and resistors R9-Rl2, potentiometer RP, capacitor C, diode VD composition .

By the seven-segment LED driver circuit voltage comparator ( ICl by the operational amplifier integrated circuit within the N2-N4, 1C2 internal N5-N8, partial pressure of the composition resistors Rl-R8 ) and the composition of light-emitting diode VLl-VLl8 . Connected to the switch motor vehicle driving at night , flashing lights circuit + l2V power is connected . + L2V voltage by R9, RlO partial pressure after Nl positive phase input voltage produces about +8 · 6V , as the reference voltage . As the voltage across C instantaneous power on the Secretary can not mutant (near OV), Nl output is high (about l2V), this high level through Rl2 and RP on the C charge , to gradually rise the voltage across C High .

When the voltage exceeds 8.6 V across C reference voltage , Nl output goes low , Nl -phase input voltage is reduced to 3V or so , then C also approved RP, Rl2 discharge, the voltage across it to C Begin to decline. When the C ends when the voltage drops below 3V , Nl then output high rejection level , C began to charge , repeat the process , so that Nl positive phase input voltage from 3V gradually rose to 8.6 V, and then slowly Slowly reduced to 3V ... ... so the cycle than to form a continuous oscillation . + L2V voltage divider by the Rl-R8 after the N2-N8 , respectively, large end of the inverting input produces 3.4 V, 4.3 V, 5.2 V, 6V, 6.8 V, 7.7 V and 8.5 V voltage As N2-N8 reference voltage .

C lower than the N2 in the voltage across the reference voltage 3.4 V when , N2-N8 are the output low , VLl-VLl8 not bright . When the voltage across C up to 3.4 V above ( slightly higher than the workers 3.4V start) , N2 output low , so VLl-VL3 light . When the voltage across C up to 43V above , N3 output high , N2 output low , VL4-VL6 light , but VLl-VL3 out . When the voltage across C up to 5.2 V above , N4 output high , N3 output low , so VL7-VL9 light , while the VL4-VL6 out .

When the voltage across C above up to 6V , N5 output high , N4 output low , it VLlO-VLl2 light , but VL7-VL9 out . When the voltage across C up to 6.8 V above , N6 output high , N5 output low , so VLl3-VLl5A bright, but VLlO-VLl2 out . When the voltage across C up to 7.7 V above , N7 output high , N6 output low , so VLl6-VLl8 light , but VLl3-VLl5 out . When the voltage across C up to 8.5 V when , N8 output high , and N2-N7 are the output low , VLl-VLl8 are off . With the start discharging C , C decreasing voltage across , when the voltage down to 8.5 V or less ( slightly below the 8.5 V start) , N8 output low , so VLl6-VLl8 light ; when C ends Voltage falls below 7.7 V , N7 output low (N8 still output low ), so VLl3-VLl5 light , but VLl6-VLl8 out ¨ Such as the constant voltage drop across C , VLlO-VLl2, Vl7-VL9, Vl4-Vl6 and VLl-VL3 then turn light off , completed the lighting of the reverse flow process .

Since the voltage across C work with the oscillator slowly increased , decreased slowly changing, so VLl-VL8 constantly positive , reverse light river flow .

Adjusting the resistance of RP , can change the oscillator frequency , thereby changing the speed of light-emitting diode flashes . Components Selection Rl-Rl2 or l/2W use 1/4W metal film resistors .

RP use of organic solid variable resistor . C use a value of 25V voltage aluminum electrolytic capacitors .

1N4007 type silicon rectifier diode VD selected .

VLl-VLl8 are selected f5mm or f8mm high- brightness light-emitting diodes , one can choose the color red or a variety of color combinations .

If it wants to increase the number of light-emitting diodes , can be every three LEDs in series , then with the other three LEDs in series in parallel .

ICl and IC2 are all made of type LM324 quad op amp IC .

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Car flashing light controller circuit