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***

Banggood

1. LED Strip Light - https://goo.gl/sCdDTX

2. 555 IC - https://goo.gl/eePxAN

3. Pot Knob - https://goo.gl/eZRT9L

AliExpress

1. LED Strip Light - https://goo.gl/1jgvRF

2. 555 IC - https://goo.gl/sb37S5

3. Pot Knob - https://goo.gl/MVeCHH

Amazon USA

1. LED Strip Light - http://amzn.to/2eVDY2J

2. 555 IC - http://amzn.to/2vgxMcD

3 .Pot Knob - http://amzn.to/2h2F5hN

Amazon IND

1. LED Strip Light - http://amzn.to/2vSfYkV

2. 555 IC - http://amzn.to/2uHPjc4

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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19 Discussions

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todorpet

Question 5 days ago

Hello there! I decided to do this same project with slightly differences
as in some of the updates mentioned in the comments. Basically I am
using the same schematic, however instead of the BC547 I am using TIP31C
and the LED strips are 5 meters long( 400mA per meter = 2 A in total
for all the lights to work correct I guess). Did not had power supply of
12V 2/3 A , so I had to use the closes I have which is 12.44V and 8A .
Still, it is not working and I am starting to think that my soldering is
not good. No smoke when I switch it on :D , however the first time
heard a cracking noise and I think that the NE555 or TIP31C might be
dead. Any ideas on what might be causing the issues and if that power
supply that I am using is ok? Thank you!

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SirLucians Solutions

Question 5 weeks ago

amazing editing. looks like you just put the piece in and it got soldered

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DimaS29

7 months ago

Here is the pcb layout:

Board.PNGSchematic.PNG
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DimaS29

7 months ago

Here is my circuit connections: 1) General 2) Close on the op amp 3) Close on the bd13

WhatsApp Image 2018-11-16 at 23.57.05.jpegWhatsApp Image 2018-11-16 at 23.57.04 (1).jpegWhatsApp Image 2018-11-16 at 23.57.04.jpeg
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sonicam

Question 11 months 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?

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Kishan Hebbar ModsM

Question 1 year ago

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

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InBrTgAaaL

1 year ago

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

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FedericoC26

1 year ago

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?
Thanks!

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bkeskin

1 year ago

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

1 reply
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VlatkoS2

1 year ago

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

FVFTYQDJ5UA4152.MEDIUM.jpg
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MarceloG19

1 year ago

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
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DIYTechStudioMarceloG19

Reply 1 year ago

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

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johnm1

1 year 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
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DIYTechStudiojohnm1

Reply 1 year ago

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.