Led Resistor Calculator

Solar energy passes the desert test

A demo (DC590B) board a PIC microcontroller that interfaces with the other demo board (DC571A), a differential 8-channel 24-bit ADC (LTC2418). Only four channels are used. Two channels of ADC measurement in V-and V-out. The other two measurement channels II-in and out of tensions as a ratio of the current, using a current amplifier on the other board. The board has been slightly modified with changes in resistance ratio 0.1V/1A. I wrote the code that would cover four differential channels of the ADC, take a snapshot of the measured voltages, convert, calculate the efficiency, and display on the LCD.The result is a simple system that displays Vs (voltage of the solar panel), I-in (input current of the battery charger), Vb (battery voltage), I took out (output current of the battery charger to the 12V lead-acid battery), and calculated yield (Vb x I out) / (Vs-x I-in) x 100. The last step was to make the unit run off a 9V alkaline battery to carry with me, but also able to use the 12V lead-acid battery. Another tip (DC823B) used a 5V buck regulator to regulate the entire system of solar battery charger.I connected the battery 9V Alkaline V-terminals in the demo board with the 5V output selection jumper.

Update: Elektor Electronic Toolbox (iPad Edition) (Productivity ...

Elektor Electronic Toolbox combines electronic reference material with calculation and conversion tools in one handy app. Whether a professional or hobbyist, the app gives users a collection of the most important electrical information right at their fingertips.<b>PLEASE NOTE:</b> The App supports the following languages: English, French, German, Italian, Netherlands, Spanish and runs on all devices from iPod Touch, iPhone 2,3G,3GS,4 and iPad from iOS 3.1.2 to iOS 4.x. Both Apps (iPhone and HD) are now identical so there is no need to buy the other version if you already have one. <b>Elektor Electronic Toolbox combines 28 different categories, all with a consistent look and feel. Categories include:</b>• Type listings (with color coding) for Resistors including SMD types and Capacitors• Databases for Transistors, FETs, Triacs, Thyristors, Diodes and ICs• Calculating circuit values for Resistor, Capacitor, Coil, and Filter circuits• An Ohms Law calculator• Unit conversion for numerous types of Measurements (pressure, energy, distance, speed, weight, etc.)• A database for common electrical Symbols• An Indices database of common electrical components• Calculation of voltage regulators with 78xx,79xx,LM317 or LM337• NE555 circuit design• Op-amp circuit calculation• Number base converter (Hex, decimal, binary etc.)• Frequency, period wave-length calculation• LED / resistor calculation• Voltage divider calculation• R/L calculations• BJT calculations• Schematic Diagrams• Pinouts of Audio, Video, Computer or phone socketsWith many of the categories, input values can be entered with unit levels included (m, k, μ, etc.), providing automatic conversion to the appropriate value. The app provides visual displays of the circuits and components being used, further simplifying its use. An enormous database is also included with information for over 15000 transistors, ICs, diagrams, and component specifications, all available without an Internet connection.Database examples:• The transistor, FET, Triac, Thyristor und Diodes database contains over 45000 types and a full text search is available to find and compare types• The transistor database includes data such as NPN/PNP, silicon/germanium, Ptot, Vcbo, Icmax, etc.

LED Calculator - Current limiting resistor calculator for LED arrays

Free Desk Top LED resistor Calculator-http://tiny.ly/x54Q

Introduction to Light Emitting Diode Technology and Applications

1.1.4.3.2.1 Determining the Resistor Values If you need to hook up LEDs in parallel ... In fact, if you enter the search term “LED calculator,” you can find ...

Open Softwear

If you need to calculate the resistance to use for your LED I recommend you use an online resistor calculator. (www.dannyg.com/examples/res2/resistor.htm). ...

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For our purposes, consider luminous intensity the “brightness” of an LED. ... These calculation's are based on Ohm's law. To use a resistor calculator, ...

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LED Resistor Calculator Mark V. Dobrosielski ... The second section, Calculated I & R Values and Suggested Resistors, calculates the needed resistor values ...

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In a few cases, a series resistor must be added between one lead of the optoisolator's ... of even a hand calculator can be used to control external events. ...