Tuesday, January 19, 2016

Simple PWM Lamp Dimmer using NE555 IC - Electronic Circuit Schematic Diagram

ElcoHow. - We think as electronic student or hobbyist will not foreign again with 555 IC. It is because there are many application of 555 IC in electronic design and project. One of the application using 555 IC is  PWM Lamp Dimmer.

In here we will give you one electronic circuit of Simple PWM Lamp Dimmer using NE555 IC like in Figure 1. below. Beside we give you electronic circuit, we also will give you component list of this circuit and simple description about this Simple PWM Lamp Dimmer using NE555 IC.

Electronic Circuit

Figure 1. Simple PWM Lamp Dimmer using NE555 IC (Source: Screenshot of Circuitstoday)

Component List
  1. IC1 = NE555
  2. R1,R2,R4 = 1K
  3. R3 = 50K
  4. D1 = IN4007
  5. C1,C2 = 0.01 uF
  6. Q1 = 2N2222
  7. Q2 = BD139
  8. L1 = 12V/5W lamp

Electronic circuit like in Figure 1 above is Simple PWM Lamp Dimmer using NE555 IC circuit. According Circuitstoday site that published this circuit describe that NE555 timer IC which is wired as an astable multivibrator operating at 2.8KHz forms the heart of this circuit. Resistors R1,R2, POT R3 and capacitor C1 are the timing components. Duty cycle of the IC’s output can be adjusted using the POT R3. higher the duty cycle means higher the lamp brightness and lower the duty cycle means lower the lamp brightness. Diode D1 by-passes the lower half of the POT R3 during the charging cycle of the astable multivibrator. This is done in order to keep the output frequency constant irrespective of the duty cycle. Transistors Q1 and Q2 forms a darlington driver stage for the 12V lamp. Resistor R4 limits the base current of transistor Q1.

For more about description about Simple PWM Lamp Dimmer using NE555 IC circuit like Understanding the variable duty cycle astable multivibrator and How does the frequency remain constant irrespective of the position of POT3 knob, please read more these information here.

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