About: Ibrar Ayyub

A circuit that properly charges sealed lead-acid batteries ensures long, trouble-free service. Fig 1 is one such circuit; it provides the correct temperature-compensated charge voltage for batteries having from one to as many as 12 cells, regardless of the number of cells being charged. The Fig 1 circuit furnishes an initial charging voltage of 2.5V […]

Switching DC/DC voltage converters are popular because they provide efficient power conversion that can exceed 90 percent. That is an advantage both when input power is at a premium and when it is difficult to get the heat out (common challenges for engineers designing compact portable products). With key power component manufacturers offering products that […]

(Phys.org) —In a maze of blindingly complex reactions that snap oxygen atoms off cellulose or other bio-sources to create energy-dense fuel, the starting molecule’s size has a curious effect. If the oxygen-rich molecule is too short to comfortably stretch to a catalyst’s active site, oxygen atoms are split from its hydrocarbon chain instead of staying together as happens when the molecule can reach across, according to scientists at Pacific Northwest National Laboratory (PNNL) and Baylor University.

This is a open source project of RC Car with control from Android Phone via Bluetooth. The controller is used with .NET Micro Framework: FEZ Panda II, but you may use any controller works with .NET Micro Framework core (Netduino, GHI Electronics board’s and other). All source code is available at GitHub. To control the machine […]

Thalamus is a small board containing a USB-capable 32-bit 72MHz ARM Cortex-M3 microcontroller, 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer and barometer. Thalamus started out life as a flight controller for the R10 Quadrotor systems, providing stabilization at 400Hz. However, packing a fast microcontroller with native USB capabilities, and with two SPI ports for communications, Thalamus […]

This is a small project to get you started with the electric imp and a Thermistor so you can see how you can get temperature readings updating live on a web site. This instructable will address both the hardware and the web site along with all the parts in between. I’ve tried to keep it […]

A group of researchers led by Hendrik Bolink of the Institut de Ciència Molecular (ICMol) of the Scientific Park of the University of Valencia has developed a thin film low cost photovoltaic device with high power conversion efficiency. The results of this work, done in collaboration with researchers of École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, were published in the scientific magazine Nature Photonics.

Suppose that you need to test a 1.5V, AA-size alkaline battery. You can apply a short circuit and measure current, or you can measure open-circuit voltage, but neither method properly tests the battery. A suitable test current of approximately 250 mA gives you a more reasonable test. You can use a 6Ω resistive load at […]

This voltage monitor has been designed to remotely display battery voltage so that people monitor and maintain their batteries easily. It was designed for use on off-grid reneable energy systems (such as my solar PV system), but it would also be useful to anyone who has a lead-acid battery, such as caravans, boats and cars. […]

(Phys.org) —3M has announced a joint venture with Cambrios Technologies, a nanotechnology company, to produce a new line of touch sensitive screens based on silver nanowire ink developed by Cambrios. The announcement marks a move by 3M into nanowire based technology for touchscreen displays and away from the traditional indium tin oxide design.