LED Arrow running light for safety car

Imagine that your car is broken on the way home. The battery is damaged or has run out of power.

At that time, very late at night.

How to make the rear car know And slow down. To reduce accidents. This LED Arrow running light circuit may help you.

How it works

See in the circuit below. It is one type of LED chaser circuit. Also, it can drive LEDs run. We should many circuit form, right?

This circuit we use CMOS digital IC, CD4093, CD4520, and CD4094.
Use a total of 17 LEDs. To show on Arrow form.

Adjust the speed with resistors R1.

When entering the power supply to the circuit IC1.

led light running arrows showing the position

A NAND gate IC Oscillator generator circuit is connected to the input signal generator to pin 1 of IC2 and pin 3 of the IC3.


When receiving the signal from IC1 IC2 will serve up the signal from the logic into the binary.

Then sent to the pin 5 and pin 6 of IC1, IC1, which will process a NAND gate.

The IC3 is the signal from IC1 to processing and export of pin 4, 5, 6 and 7.Then entered into the base of the transistor pins Q1-Q4.

Any work on the transistor connected to the LED pin collector will glow out come.

For the format of the 17 LED Lights, arranged as a form of directional arrows.

Parts you will need

Semiconductors
IC1: CD4093, Quad 2 input Schmitt NAND Gate IC
IC2: CD4520, CMOS Dual Binary Up-Counter
IC3: CD4094, 8-Bit Shift Register / Latch with 3-STATE Outputs
Q1-Q4: BC337, 45V 0.8A NPN Transistor
LED1-LED17: As you like

0.25W Resistors, tolerance: 5%
R1: 22K
R2, R4, R6, R8: 10K
R3, R5, R7, R9: 4.7K
R10, R11, R12: 470Ω
R13: 270Ω

C1: 4.7uF 25V Electrolytic
C2: 220uF 25V 220uF 25V

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