Light Dimmer


Posted on Feb 4, 2014

The concept behind the light dimmer is to control the voltage to the light lamp or any source. Light dimmers regulate the voltage to the source they are connected to. This regulation of voltage increases or decreases the light intensity. Light dimmers first appeared in the market around 1960s. In the beginning light dimmers used adjustable power resistors and transformers to


Light Dimmer
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regulate the voltage. The use of transformers in early light dimmers did not prove a success. The light dimmers produced poor results and were expensive and non durable. As the electronics made progrss over the time, new methods and components were invented. Thyristors and triacs came to teh market and because of these components, new modern light dimmers were invented which were cheap, durable and gave better results. Today, modern light dimmer manufacturers use thyristors and triacs in their construction. Light dimmers are very inexpensive and ranges from $5-$30 depending on the model and manufacturer. Light dimmers are the best replacements for regular light switches because of there many features like durable, easy installation and different attractive styles. Light dimmers have the following important features. We can build our own light dimmer circuit for fun or for our science project. Following is the circuit diagram of a 12V light dimmer switch. The circuit is constructed with 555 time oscillators and resistors. Two different circuits are shown for light dimmer. One shows the circuit when lamp is connected to the positive connection and the other connected to the negative side of the supply. The circuit uses the principle of capacitors which is when charged produces short positive interval and long negative interval which dims the intensity of the light. Light dimmers are connected to mains, therefore safety...




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