Good day to you all, today i will discuss about a light dimmer using a triac and a diac. I hope you will learn something from it. There are many types of devices that will make a light dimmer but we use a triac and a diac to produce a light dimmer.

http://www.trailerlife.com/wp-content/uploads/2017/02/RV-clinic-light-bulbs-1.jpg
<a href="http://www.trailerlife.com/lifestyle/interior-lights-dimming/"><sup>image source</sup></a>

### What is a Light Dimmer, TRIAC, and DIAC? 
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<div class="pull-right">
 https://cdn.steemitimages.com/DQmQLT15MRGLhGTXV89YgBp9pg7fFTgyQzS6qKGFjCkwpMh/pizap.com15274162236611.jpg
<center>Photo credits from above: <a href="http://www.noushouse.com.au/store/product-list.php?Clipsal_C-BUS_Output_Units_Dimmers-pg1-cid78.html">1</a>
<a href="http://www.yourduino.com/sunshop/index.php?l=product_detail&p=330">2</a>
<a href="http://www.globalsources.com/gsol/I/Rectifier/p/sm/1133382620.htm">3</a></center>
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Light dimmer are devices that are used to lower or higher the brightness of the light. Using a potentiometer, that act as a rheostat, we can change the intensity of the light output. 

TRIAC (TRIode for Alternating Current) is a device that is widely used in power control and switching applications. It is usually called a bidirectional triode thyristor or bilateral triode thyristor.

DIAC (Diode for Alternating Current) is a diode that only conducts a current after the breakover voltage that has been attain momentarily.

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### The procedures and the materials used
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Type of Material | quantity 
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Light Bulb (25 W)| 1 piece
Universal Printer Circuit Board| 1 piece
Socket| 1 piece
Switch| 1 piece
Potentiometer (500kΩ)| 1 piece
BT136 Triac| 1 piece
1N5758 Diac| 1 piece
0.12uF Capacitor| 1 piece
3.3kΩ Resistor | 1 piece
wire| 2 meters

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This project involves the designing and planning of a light dimmer using a TRIAC and DIAC. There are two phases in designing a light dimmer using a TRIAC and DIAC. The first one is the simulation part and second one is the physical part where there is a designing on a universal printed circuit board (PCB).

We construct our circuit in simulation so that we can experiment if the design can produce a precise output or not. In simulation part, we do not need to buy components in testing the design we only need a simulation program running on a computer. In this case, we use multisim to simulate a light dimmer using a TRIAC and DIAC.

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<div class="pull-left">https://cdn.steemitimages.com/DQmYGzbdNcegQaLXC1Yud4pV7qNuv1H7eJFajs96C63QpFs/1.png</div>

<div class="pull-right">https://cdn.steemitimages.com/DQmNVezgnZX4nXqMeUmYLuL19jfZHJUPn8FSa7bgPReRdct/Untitled.png</div>
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<div class="pull-right">https://cdn.steemitimages.com/DQmQjeh2Uci2o8rWHSpnYUuRbGJPBQAh3zyC5HEN6K3xQ6M/Untitled.png</div>

We ensure a slowly but surely process in making this project because we might end up buying a new materials if it fails. 

After a couple of hours of making this project, this is our output of the circuit. It was indeed a simple light dimmer project. A simple can make it a better solution rather than a complex one.

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We test it in a 220V AC source so that we will know it will work or not. Take note that this is the first time we test in a 220V AC source. 

<div class="pull-left"> <center>https://cdn.steemitimages.com/DQmct7MfvDaehawnaMxUWwtDCwL3wVyKCw17qGJXY2adrHi/Untitled.png</center>
<center><i>A maximum adjustment of the potentiometer</i></center></div>
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<center>https://cdn.steemitimages.com/DQmco55Kct8SQHGHLg7BD1xQgDaZCqvkXjt35cgi4mSWjH5/Untitled.png</center>
<center><i>An average adjustment of 
the potentiometer</i></center></div>

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<center>https://cdn.steemitimages.com/DQmfGJrBLBFm8kYFL4JueyozzvvzX3MwsJZg2gaxFDEdQzU/Untitled.png</center><center><i>A low adjustment of the potentiometer</i></center>

### Conclusion
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With our enormous brainstorming from the project, we learn how to design and construct the dimmer light circuit in physical part/hardware in universal PCB. This project helped us to know how to construct the circuit of dimmer that use in some houses using triac and diac and potentiometer as a rheostat. In the whole, we successfully design the light dimmer on the universal PCB and it worked.