LED strip dimmer circuit using 555 ic | PWM LED dimmer

In this video, we will make a simple 12v LED strip dimmer circuit using a 555 timer. We can easily control led brightness with this 555 PWM LED dimmer circuit.

Required components for the LED strip dimmer circuit
1. 555 timer ic 1no
2. IRFZ44N MOSFET 1no
3. 50k Potentiometer or trimmer 1no
4. 0.1uF ceramic capacitor 2no
5. 1k Resistors 2no
6. 1N4007 Diodes 2no
7. Breadboard

During the video, I have shared both the breadboard schematic and circuit diagram of the PWM led dimmer. Here we can easily control the 12v led brightness with the potentiometer.

#LEDdimmer #555ic #TechStudyCell

Working of the 555 led dimmer circuit:
The 555 timer Astable arrangement creates a square wave with time high and time low. The ratio of these times can be varied by changing R1, R2 and C1 in a typical 555 astable arrangement.
Here we have made  R2 (50K POT) as a variable resistor for changing the duty cycle of the output signal. Capacitor C1 Charging through D1 diode and Discharge through D2 diode will generate PWM signal at 555 timer's output pin  (PIN3). Accordingly, the MOSFET turns on and off.

The time the square wave is high can be calculated by 0.7 x (R1+R2) x C1

The time the square was is low can be calculated by 0.7 x R2 x C1

This a very useful 555 ic project and after watching this video you can easily make this led dimmer circuit on the breadboard.

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[TechStudyCell]

Hi, during the video I have shared circuit diagram and breadboard schematic with the required component specifications. So after watching the complete video, you can design this circuit without any trouble. Please do share your feedback. Thank you.

[jamesallen]

Thank you for sharing this idea. I made this with 1N4007 and then 1N4148, and there was no noticeable difference. Thanks again.

[emanuelsrrr]

Great! I tried it with an IRF3205 and works perfectly!

[derFleder]

Thank you! What would I have to change to make this work efficiently with a 5V LED Strip?

[zemoac]

Hi, interested in substitute the potenciometer for a LDR in order to simulate the sun light, can you help me in this necesity?

[imrankadirov]

@Tech StudyCell Collected as shown, everything works, but only you did not answer the question how many amperes of load will it withstand ??? does it depend on the transistor? on the diagram is IRFZ44N on the datasheet costs 35-49 amperes and will it really stand?

[abbasrasti]

Hi Friend In your schematic circuit and PCB the capacitors have polarity are they correct

[chillidogkev]

Looks a very good video but got half way through and couldn't stand that awful music any more so turned off. In general I absolutely hate videos of serious, technical things that have no human vocal interaction and have an irritating synthesiser music backing track. It's impossible to concentrate. The two things just don't go together.

[computerhouse]

Sir can you make this using touch sensor pll

[imrannadiroglu]

Thank you very much for the video. How many amperes can you load?

[fikajlo]

I made the circuit but I can't get the led diode to work on 100% power when I turn the potentiometer fully it only goes up to 60% what can I do to make it able to run the LEDs on 100% power?

[kennmossman]

A 1N4007 diode??? Are you expecting a PIV of 1000 Volts? Surely a signal diode such as the 1N4148 would be far better choice.