capacitance to accuracy better than 0.5% has been improvised and rendered auto-ranging by means of an 89c51 circuit. The principle is that of a “direct” or fundamental principle of the time constant of the component. For e.g.‚ the time taken to charge a capacitor to 50% of the applied voltage is given by 0.5 V = V (1- exp (-t/τ) ) The value of t is determined as 0.69314718τ. Knowing t by an uninterrupted time measurement on the processor‚ we can find the value of capacitance. Applications: * It
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integral to modern electronics. They can convert a voltage source (typically 8 V to 25 V) into a lower regulated voltage (typically 0.5 V to 5 V). Stepdown converters transfer small packets of energy using a switch‚ a diode‚ an inductor and several capacitors. Though substantially larger and noisier than their linear-regulator counterparts‚ buck converters offer higher efficiency in most cases. Despite their widespread use‚ buck-converter designs can pose challenges to both novice and intermediate power-supply
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droplet and the electrode‚ generating electrical current that can be used to power the external load. Figure 2. Schematics of the electric circuit. variable capacitor C is the REWOD unit‚ which represents a harvester set-up‚ that is‚ a set of droplets in contact with the electrode grid [1]. The droplet thus acts like a variable capacitor. As the areal overlap at the liquid–solid interface decreases‚ so does its capacitance‚ and excess charge flows back through the electrical circuit. In
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compensate‚ series capacitors are connected‚ decreasing the effect of the inductance. Shunt compensation In shunt compensation‚ power system is connected in shunt (parallel) with the FACTS. It works as a controllable current source. Shunt compensation is of two types: Shunt capacitive compensation This method is used to improve the power factor. Whenever an inductive load is connected to the transmission line‚ power factor lags because of lagging load current. To compensate‚ a shunt capacitor is connected
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ELECTRONICS CAREER www.ecatn.blogspot.com BARC SAMPLE QUESTION PAPER FOR ELECTRONICS If you like my site please support us by sharing website (www.ecatn.blogspot.com) to your friends 1. Differential amplifiers are used in a. instrumentation amplifiers b. voltage followers c. voltage regulators d. buffers 2. The output voltage Vo of the above circuit is a. -6V b. -5V c. -1.2V d. -0.2V 3. The ideal OP-AMP has the following characteristics. a) Ri=∞ ‚A=∞ ‚R0=0 b) Ri=0 ‚A=∞ ‚R0=0 c) Ri=∞ ‚A=∞ ‚R0=∞
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Transformer 2.1.2 Rectifier 2.1.3 Smoothing 2.1.4 Regulator Component List Schematic of Variable Power Supply Working of the Circuit 2 2 2 2 3 3 4 5 2.2 2.3 2.4 3-HARDWARE PORTRAYAL 3.1 3.2 3.3 Transformer Diode Capacitor 3.3.1 Electrolyte Capacitor 3.3.2 Unpolarised Capacitor 3.3.3 Capacitor Colour Code Resistor 3.4.1
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• Working of Security System • Power Supply Description ▪ Transformer ▪ Bridge Rectifier ▪ Shunt Capacitor ▪ Voltage Regulater • GSM • About The Sensors ▪ Gas Sensor ▪ Infraed Sensor ▪ Fire Sensor • Component Discription ▪ A . Microcontroller ▪ B . Transformer ▪ C Resistors ▪ D Capacitors ▪ E IC ▪ F Diodes •
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CHAPTER 1 INTRODUCTION 1.1 Introduction of Project ―GSM based Control System‖ implements the emerging applications of the GSM technology. Using GSM networks‚ a control system has been proposed that will act as an embedded system which can monitor and contr ol appliances and other devices locally using built-in input and output peripherals. Remotely the system allows the user to effectively monitor and control the house/office appliances and equipment via the mobile phone set by sending commands
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University of the Philippines College of Science PHYSICS 72 SET A Second Semester 2010-2011 First Long Examination National Institute of Physics 2nd Sem AY 2010-2011 Physics 72 INSTRUCTIONS: Choose the best answer and shade the corresponding circle on your answer sheet. To change your answer‚ cross-out and sign your original answer and then shade your new answer. No computational devices allowed (e.g. calculators‚ mobile phones). Following instructions is part of the exam. Useful
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Input Filter Design for Switching Power Supplies: Written by Michele Sclocchi Michele.Sclocchi@nsc.com Application Engineer‚ National Semiconductor The design of a switching power supply has always been considered a kind of magic and art‚ for all the engineers that design one for the first time. Fortunately‚ today the market offers different tools that help the designers. National Semiconductor was the first company to offer the “Simple Switcher” software‚ and an on-line simulation tool
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