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DIY Hobby projects, diagram, schematic

12V DC Light Dimmer Circuit Using 555 Timer IC

electronicecircuits, January 2, 2011August 15, 2023
12V DC Lamp Dimmer Circuit Using 555 Timer IC

12V DC Light Dimmer Circuit Using 555 Timer IC

This is a 12 volt at 2 amp Lamp dimmer that can be used to dim a standard 25 watt bulb by controlling the duty cycle of a astable 555 timer oscillator.

12V Lamp Dimmer Circuit Diagram Using 555 Timer IC


PARTS LIST
R11KΩ
R21KΩ
R3100Ω 2W
VR150KΩ Preset
C10.1µF (104)
C2470µF 25V
D11N4001
Q1BC140
Q22N2955
LAMP112V Light

When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness.

555 Timer IC pin configuration NE555 SA SE555 SE555C
555 Timer IC PIN Configuration

When the potentiometer is at the lower position, the capacitor will charge through both 1k resistors and the 50k potentiometer and discharge through the lower 1k resistor, producing a long positive interval and short negative interval which brightens the lamp to near full intensity.

 

BC140 NPN transistor pinout
BC140 PIN Configuration

The duty cycle of the 200Hz square wave can be varied from approximately 5% to 95%.

This DC Light Dimmer circuit drive more power light using 2 or more parallel 2n2955 transistors with good heat sink.

12V DC Lamp Dimmer Circuit Using 555 Timer ICLight Dimmer Circuit using ne555 2n2955 bc14012V Lamp Dimmer Circuit Using 555 Timer IC

Please send your ideas, which are very important for our success…

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Comments (13)

  1. question says:
    March 2, 2011 at 8:35 pm

    on the circuit, where does port 5 goes from the 555 ??

    Reply
  2. Naje says:
    March 26, 2011 at 4:29 am

    is it possible to have a digital potentiometer instead of VR1?
    I’m designing a dimmer switch which can be controlled wireless. So I have a decoder. So basically what I want is to connect the decoder, timer and the digital pot to the dimmer switch..

    Reply
  3. abdul says:
    June 7, 2011 at 4:14 pm

    pin 5 of 555 ic should not be connected any where

    Reply
  4. Er.Shahbaz Ahmad says:
    June 22, 2011 at 12:08 pm

    abou pot 5………
    any body tell me.[img]http://img2.orkut.com/images/milieu/1/1255866533791/475975442/ln/Z1dvx8rv.jpg?ver=1255866534[/img]

    Reply
  5. TOMMY says:
    July 13, 2011 at 5:45 am

    So I can drive lamp bulb 12v for 555??

    12V 2W Lamp is ok for me. I have schematic 555 for 1 led. But I want have 1 lamp bulb instead!

    S1 On lamp S2 Off Lamp. I Want have 555 on 12v.

    Resistor is 100K for 12V??

    http://tronixstuff.files.wordpress.com/2011/01/555bistablesch.jpg

    Reply
  6. MR KHAN says:
    July 27, 2011 at 7:09 pm

    hi ……………………….

    Reply
  7. Scott says:
    August 30, 2011 at 9:44 pm

    I have a string of 12v LEDs will this circuit cause any flickering?

    Reply
  8. bakhuram says:
    May 30, 2012 at 11:25 am

    i want design disco light circuit for “HAPPY WEDDING”. so. how can i it to design ??

    Reply
  9. Simon G says:
    June 16, 2012 at 6:42 am

    Hello,

    I suggest this idea :
    Sunset/sunrise light dimmer 12v and 120v

    – Imitate a sunrise and a sunset for a 20 minutes with light bulb.
    – Between them, the light can go off, if sunlight is strong enough outside a range.

    – for 12v and, if possible, 120v.

    Thanks.

    Reply
  10. nagaraj says:
    March 29, 2014 at 10:36 pm

    i want full details quk.

    Reply
  11. Harry says:
    August 12, 2014 at 8:06 pm

    Hi. Can you please explainmore about the function of both transistor in the circuit ?

    Reply
  12. Aravinda says:
    September 6, 2014 at 10:22 am

    how can i improve this to remote controlled dc dimmer?

    Reply
  13. myo zaw hein says:
    June 25, 2015 at 12:25 pm

    So,useful circuit for me. Thank you.
    But i want 6Amp instead of 2Amp, can i get 12v dimmer circuit for 6Amp.

    Reply

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