Simple & Easy Dimmer Circuit Using 555 IC for LED Strip Lights





Introduction: Simple & Easy Dimmer Circuit Using 555 IC for LED Strip Lights

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In this tutorial i will show you how to build a dimmer for the LED Strip Lights using 555 IC.

To build your own Dimmer Circuit using 555 IC you can watch the video embedded in this step or continue reading

Step 1: Parts List

***Parts List***

1. 555

2. 0.1uF Ceramic Capacitor - 2

3. 1N4007 - 2

4. 8 Pin IC Holder

5. 47k Ohm Pot

6. Resistor (1k & 120 Ohm)

7. BC547

8. PCB & wires


***Purchase or Affiliate Links***


1. LED Strip Light -

2. 555 IC -

3. Pot Knob -


1. LED Strip Light -

2. 555 IC -

3. Pot Knob -

Amazon USA

1. LED Strip Light -

2. 555 IC -

3 .Pot Knob -

Amazon IND

1. LED Strip Light -

2. 555 IC -

Note: all the purchase links provided are affiliate links

Step 2: Circuit Diagram

Construct the circuit diagram as shown in the circuit diagram. The circuit should be powered above 10 volts & the voltage should not exceed more then 14 volts. To control the brightness you can use the pot.



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15 Discussions


Question 3 hours ago

This is exactly what I want to do with my LED strip - Thank you!

Do you know how I could add a simple sine wave oscillator to make it fade in and out automatically ? Or is that very complicated?

What is the voltage and current rating inputted here for 555 and Bc547

Excuse me,

i know how the 555 timer works

but how the whole circuit works ?

like what do the diodes do and what do the capacitors do?

thanks though

Really Interesting!
I have a question...
There are some resistors in the circuit but what is it the value of watt of the them?
1/2W? Or more? Do I need to choose the same value of the led strip?

instead of using tip31, is it possible to use an N channel mosfet(ex. irlz44n) in order to get more current?

1 reply

I want to add a tip 31 transistor what kind of resistor should i use in R2,

because i use 120 ohms and led strip doesn't go up to full brightness


It is a good call to use a 555 for this application. In this times paople tends to abuse of microcontrollers in detriment of real electronics.

Pics, Attinys, Arduinos and other products come and go, but 555 will last for ever!

1 reply

That's for sure.. 555 timer can be used in so many application like light detector, dark detector, schmitt trigger, timer & many more.


11 months ago

Each LED in the strip uses 6.7 ma. The transistor specified has a maximum current rating of 100ma, which means it can only power 15 LEDs. The video shows of roll of LEDs being powered. Am I missing something or is a different transistor being used?

1 reply

No, The transistor used is same as shown in the circuit diagram.

The transistor specified has a maximum current rating of 100ma which is true & its not ideal for lighting more then 15 leds but if you refer the datasheet - maximum current rating - continuous is rated at 100ma. Since we are using PWM there is no flow of current continuously (this is where i took the advantage of this transistor).

Now coming to the drawback of using BC547 - with duty cycle 50% or above you cannot use this for long time for that you need to replace BC547 with the transistor like TIP31.