![12V DC Light Dimmer Circuit Using 555 Timer IC 12V DC Lamp Dimmer Circuit Using 555 Timer IC](http://www.electronicecircuits.com/wp-content/uploads/2011/01/12V-Light-Dimmer-Circuit-Using-555-Timer-IC-300x174.jpg)
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 Light Dimmer Circuit Diagram Using 555 Timer IC 12V Lamp Dimmer Circuit Diagram Using 555 Timer IC](http://www.electronicecircuits.com/wp-content/uploads/2011/01/12V-Light-Dimmer-Circuit-Diagram-Using-555-Timer-IC.jpg)
PARTS LIST | |
R1 | 1KΩ |
R2 | 1KΩ |
R3 | 100Ω 2W |
VR1 | 50KΩ Preset |
C1 | 0.1µF (104) |
C2 | 470µF 25V |
D1 | 1N4001 |
Q1 | BC140 |
Q2 | 2N2955 |
LAMP1 | 12V 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](http://www.electronicecircuits.com/wp-content/uploads/2010/02/555-Timer-IC-pin-configuration-NE555-SA-SE555-SE555C.jpg)
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](http://www.electronicecircuits.com/wp-content/uploads/2009/11/BC140-transistor-pin-Configuration-pinout-bc-140-npn.jpg)
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.
Please send your ideas, which are very important for our success…
on the circuit, where does port 5 goes from the 555 ??
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..
pin 5 of 555 ic should not be connected any where
abou pot 5………
any body tell me.[img]http://img2.orkut.com/images/milieu/1/1255866533791/475975442/ln/Z1dvx8rv.jpg?ver=1255866534[/img]
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
hi ……………………….
I have a string of 12v LEDs will this circuit cause any flickering?
i want design disco light circuit for “HAPPY WEDDING”. so. how can i it to design ??
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.
i want full details quk.
Hi. Can you please explainmore about the function of both transistor in the circuit ?
how can i improve this to remote controlled dc dimmer?
So,useful circuit for me. Thank you.
But i want 6Amp instead of 2Amp, can i get 12v dimmer circuit for 6Amp.