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12V DC Light Dimmer Circuit Using 555 Timer IC

2014-12-17 12:22  
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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%.

You can 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


 


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