Multi Rotor Fans Club Lithium-Polymer Peak Charger Circuit Diagram - Nightly This circuit was developed to charge the Lithium-Polymer cells used in a model aircraft. Lithium-Polymer cells are incredibly lightweight compared to Ni-cad battery packs of the same voltage and amp-hour rating. Their only drawback is that they require a rigid charge and discharge regime to achieve maximum life. Circuit diagram: They should be charged using a constant-current, constant-voltage method, which stops the charge once the current has dropped to about the C/10 rate. REG1 and transistor Q2 form a current-limited voltage regulator. When the battery voltage reaches about 8.4V, the regulator limits any further voltage increase, as set by VR2. The charger is set up as follows: It to 12V DC and place a digital voltmeter between the output of REG1 and the negative output for the battery pack. The circuit should now charge your battery packs to within 97% of their rated capacity. Finally, note that in most cases, REG1 will need to be fitted with a heatsink.
Mon Drone | Tout savoir sur la fabrication d'un drone DIY FPV Monkey - Nightly Spherical Parachute Patterns - Nightly This web page will produce patterns for hemisphere parachutes for model rockets. Instructions for constructing the parachutes can be found in the May/June 2000 newsletter of the Northern Illinois Rocketry Association. The article describes the construction of 12 inch diameter parachute with 8 gores and a 2 inch diameter spill hole. This web page will produce patterns for other sizes of parachutes. As you are considering the size of your parachute, keep in mind that a spherical parachute has twice the drag coefficient of a comparable sized parasheet style parachute that comes with most model rocket kits. Parachute shroud lines should be 1 1/2 times the diameter of the parachute. Patterns include a 1/4 inch seam allowance. Please check your print settings before printing the pattern.
Richard Nakka's Experimental Rocketry Site - Nightly Solid Rocket Motor Design SRM.xls is an MS EXCEL spreadsheet that takes user-inputted motor and grain geometry data and computes Kn over the duration of the motor burn, generates a pressure-time curve, a thrust-time curve, as well as performance parameters such as total impulse and delivered specific impulse. Motor performance data is also summarized for easy input into a trajectory simulation software, such as SOAR. Although primarily intended for designing motors using KN-Dextrose or KN-Sorbitol propellant, other propellants may be specified with user inputted propellant properties. Dec.21/13 716 kbytes Zipped EXCEL 2000 spreadsheet Freeware SRM.ZIP Version: 1.00 536 kbytes Zipped EXCEL 2000 spreadsheet Freeware SRM_RU.ZIP Russian Language Version 1.08 Mbytes Zipped EXCEL 97/2000 SRM-CASTELLANO.ZIP Spanish Language Version 550 kbytes Zipped EXCEL Motor Casing Design CASING.XLS Version 1.03 61kbytes EXCEL 5.0 spreadsheet Freeware Rocket Motor Igniter Design Units Converter EzAlt PDFCreator
Aeryon Labs Inc. - Nightly HMC5883L Digital Compass Module Triple Axis Magnetoresistive Sensor Module SainSmart - Nightly We accept payment through PaypalPayPal is a safer, easier way to pay. You can use your credit card or bank account without exposing your financial information. You can link your credit card or bank account to your PayPal account so you don't have to enter your card number or address when you shop on SainSmart. Using PayPal with SainSmart: 1. ” or checkout on shopping cart page after reviewing your order details. 5. Advantages of using PayPal:Payment is traceable. Payment does not require you to use your credit card online (you can transfer directly from your bank account). Prices and Rates 1.SainSmart provides two delivery methods from which to choose: (1)STANDARD SHIPPING (Free to United States, United Kindom, Canada, Australia, Germany, France, Spain, $5 to other countries. (2)EXPEDITED SHIPPING (It's based on weight VS destination. Note: Import duties, taxes and charges are not included in the item price or shipping charges. Delivery & Tracking 1. 2. Tracking website:
Microstrip Patch Antenna Design - Nightly All about Moteino | LowPowerLab - Nightly Video introduction to Moteino Rev1: Video introduction to Moteino Rev3 and RFM69H/RFM69HW transceivers and library: Moteino is a low cost low-power open-source wireless Arduino UNO development platform clone based on the popular ATMega328 chip used in traditional Arduinos, making it 100% compatible with the Arduino IDE (programming environment). Unlike traditional Arduinos, the regular Moteino does not include an onboard USB-Serial converter, instead you need to use an external FTDI adapter to load sketches, the advantages being lower cost, smaller size. They are compatible with any other Arduino clones that use the popular HopeRF RFM12B transceiver or the newer RFM69 transceiver. Moteino also comes with an optional SPI flash chip for data logging or wireless programming. Moteino-USB includes the USB-serial FTDI chip so you can use it like any other Arduino (direct programming through USB mini). Both Moteino and Moteino-USB are available in the web shop. Quick comparison Why Moteino?
modesw - Уголок самоделкина - Nightly При управлении летательным аппаратом с полетным контроллером помимо 4 стандартных каналов управления требуется дополнительный для выбора режима, к этому каналу есть требование чтобы по нему передавалось несколько уровней сигнала, каждому из уровней соответствует определенный режим работы автопилота. Однако во всех известных мне пультах многоступенчатые переключатели отсутствуют, поэтому подобную проблему решают двумя способами:- микширование нескольких переключателей, при этом каждой комбинации переключателей соотвествует какой либо режим- использование аналогового регулятора "крутилки" Комбинации из микшированных переключателей крайне неудобны тем что в ответственный момент начинаешь теряться в управлении и совсем уже нет времени вспоминать нужную комбинацию для режима. Предлагаемое решение содержит микропроцессор 5 светодиодов, 5 кнопок и аналоговый выход. Настройка Пульта управления в качестве "монитора" можно использовать экран режимов в Mission Planner. Эскиз платы и лицевой панели