Using a resistor to limit the current can be used for small LEDs. For such low power LEDs, where the supply current is not critical it works okay. But for high-power LEDs, a better way is to use the Constant Current Driver. As the name suggests, the constant current driver will supply the same current whatever voltage it is supplied with and whatever the forward voltage … [Read more...] about Constant Current Driver Design based on LM317
Voltage, current, and resistance are three properties that are fundamental to almost everything you will do in electrical and electronics engineering. They are intimately related. In this article, we used water in a river analogy to explain what are current, resistance and voltage. This method will help the beginners to imagine and understand these fundamentals much … [Read more...] about What Are Current, Resistance and Voltage?
A Light Emitting Diode that emits one color when forward biased and another color when reverse biased is called a multicolor RGB LED. Related Article: Working of Light Emitting Diode (LED) One commonly used schematic symbol for these LEDs is shown below. Working of Multicolor RGB LEDs Multicolor RGB LEDs actually contain two PN junctions that are … [Read more...] about How Multicolor RGB (Red Green Yellow) LEDs Work?
A light-emitting diode (LED) is a diode that gives off visible light when forward biased. Light-emitting diodes are not made from silicon or germanium but are made by using elements like gallium, phosphorus and arsenic. By varying the quantities of these elements, it is possible to produce light of different wavelengths with colors that include red, green, yellow and … [Read more...] about Working of Light Emitting Diode (LED)
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an analog to digital converter. We are using internal ADC of Arduino to make Digital Voltmeter … [Read more...] about Arduino DC Digital Voltmeter