Introduction: PWM Lamp Dimmer Using NE555 Timer

This is an engineering level project in which we use PWM to dim the intensity of the LED light. Here, the DC source is connected to NE555 timer. The PWM signal always depends on the duty cycle, so we can vary the duty cycle through NE555. If we vary the duty cycle, we can generate the pulse with various width. So we use timer to generate the PWM to dimmer the LED or increase brightness of the LED. Get detailed information about this circuit in the post - PWM LED Dimmer using NE555 Timer.

Comments

author
jimgarbe made it! (author)2017-02-22

Yup, It works --- IF---- you ground the no. 1 pin ---- AND --- the entire, lower- right hand line in the schematic between the ground and the transistor output must be eliminated. I have a 10K pot but the best results is when I added an additional 560Ohms (roughly) between the no.7 pin and the pot, lowering the duty cycle to "just barely able to see the lights." Works great!

DSC00204.JPGDSC00205.JPGCircuit-Diagram-of-PWM-LED-DIMMER-USING-NE555_edited.png
author
krishnac43 (author)2016-10-14

Don't try this it doesn't work....... If u want it to work don't give supply there. But u can give supply to 7th terminal of 555 timer IC with 1k resistor by varying potentiometer u can absorb the output.

author
krishnac43 (author)2016-10-14

Is this project really work.

author
WilliamD157 (author)2016-07-03

One more comment - pin 1 of the 555 needs to go to ground. michael_tsx is also correct...

author
ol FERAL lo (author)2016-03-17

Why display 555 like that? This circuit make no sense

author
michel_tsx (author)2014-03-21

In your schematic your leds are directly grounded, bypassing the 2N2222

author
mdemi (author)2014-03-20

put as many led as possible in series. this will reduce the current consumption.

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