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Motorcycle LED Turn Signal Indicator Circuit

In this post for Motorcycle LED Turn Signal Indicator Circuit the LED flashes with chasing effect, instead of old bulb type.

IC 555 works like oscillator and gives flashing signal.

Circuit Working:

Parts List:

CategoryDescriptionQuantity
Resistors390Ω 1/4 watt5
10k 1/4 watt5
4.7k 1/4 watt3
CapacitorsElectrolytic 100μF 25V2
SemiconductorsIC 5551
Transistors BC5475
LEDs Orange 5mm 20mA10
Diodes 1N41482

This is simple motorbike LED turn signal circuit.

IC 555 used as astable multivibrator to make flashing signal.

How it works:

Motorbike battery with 12V gives power to circuit.

Main part is IC 555 with IC1 is set as astable mode with no need to trigger and it give pulse always.

C2 capacitor and R12 resistor control how fast it flash.

When power is ON then C2 charge through R12.

IC pin 3 output goes LOW with logic 0 as voltage on C2 rises.

When C2 is fully charged then output change to HIGH with logic 1.

Then C2 discharge again through R12 resistor and voltage goes down.

When voltage drop low again then output goes back to LOW.

With this up-down repeat, so LED keep blinking.

Transistors T1 to T5 work like switches and control LED current.

They turn ON one by one and make LED run in chasing style.

Diodes D1 and D2 protect transistors from voltage spike.

Resistors R1 to R13 limit current and set voltage at places in circuit.

Formulas:

Using IC 555 we can make astable multivibrator circuit for motorbike LED turn signal.

This circuit switch between two states left and right with fixed speed.

Formula for Frequency (f):

How fast it blink depends on resistor R1, R2 and capacitor C.

f = 1.44 / (R1 + 2R2) × C

where,

Duty Cycle D:

Duty cycle means how long output stay ON high vs OFF low.

D = R2 / (R1 + 2R2)

Change R1, R2 and C to make blink speed right for our motorbike turn signal circuit

How to Build:

To build a Motorcycle LED Turn Signal Indicator Circuit follow the below mentioned steps for connections:

Safety Tips:

Conclusion:

This Motorcycle LED Turn Signal Indicator Circuit is better than old bulb type which are brighter, longer life and with less power.

But for safe use we must check motorbike compatibility and use LED flasher relay and install it carefully.

References:

Turn signal for my motorcycle

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