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Puff to Off LED Circuit Working Principle: The main principle of the circuit is to turn off the LED by a puff. The puff applied to the mic is converted into a voltage whose value is very small. This voltage is amplified and applied to the circuit in order to make the led turn off. Puff to Off LED Circuit Diagram: Circuit Components: Electret condenser mic Light Emitting Diode BC 550 (NPN )transistor BC 337 (NPN )transistor BC 327 (PNP )transistor...

The USP of the Lumia is the camera and top-of-the-line build; whereas the S4 boasts of very powerful hardware. Both phones are proven beasts – The Lumia 920 showed off some real good build quality while the S3 was the phone for the entire of 2012. Let us first have a look at their specifications: Conclusion To be fair, we cannot choose one winner out of the two; both these devices are top class in their own way....

“SanDisk has been at the forefront with storage solutions that enable the broader adoption of new video capture technologies. We always design our SanDisk Extreme Pro cards with professional photographers and videographers in mind,” said Rajesh Gupta, Country Manager India, SanDisk. “Cinema-quality 4K video capture demands tremendous performance and capacity, which is exactly what we have delivered with the new 256GB SanDisk Extreme Pro CompactFlash card.” The write speed available on these cards is 65 MB per Second Square which is optimum enough to capture up to 4 K video recording....

Simmtronics XPAD FUNDROID Q1 and XPAD FUNDROID Q4 sport a 3.5 inch display with 320 x 480 pixel resolution. Both of these smartphones are powered by a 1 GHz single core processor and support dual SIM connectivity. Camera modules are also same with 2 MP/ VGA camera combination. Simmtronics XPAD FUNDROID Q1 however runs on Android 2.3 Gingerbread O.S. which is quite obsolete now. It also packs a slightly bigger 1400 mAh battery as compared to FUNDROID Q4 with 1250 mAh battery....

Car Battery Charger Circuit Working Principle: This is a simple car battery charger circuit with indication. The battery is charged from a 230V, 50Hz AC mains supply. This AC voltage is rectified and filtered to obtain an unregulated DC voltage used to charge the battery through a relay. This battery voltage is constantly monitored by a feedback circuitry compromised of a potential divider, a diode and a transistor. The relay and the feedback circuitry are fed by a regulated DC voltage (obtained using a voltage regulator)....

First, we will take a look the basics of solar panels and solar battery backup system. We will see the components of the system, their pros and cons. After that we will do the same for generators. Later, we will make the solar panels vs generator comparison to find out the differences and understand which is better for residential use. A Brief Note of Solar Panels (Solar Battery Backup) A solar battery backup is a system that uses solar panels to generate electricity and stores excess energy in a battery for later use....

What Is Windows Memory Management? Memory Management is responsible for maintaining the windows 10 memory. It ensures your OS remains effective and fast and continues to work without any glitch. The memory management deploys memory blocks to ensure the application runs in Windows. Moreover, it tracks the possible and existing memory locations in the system and maintains the performance of your RAM. Thus easy, it decides how to effectively optimize memory allocation for each program and ensure the windows run faster without any error....

When it comes to the keyboard, the Surface keyboard offers distinct advantages such as lower hardware and software costs, software optimization, faster typing, and portability. However, like a normal keyboard, the surface keyboard is also prone to problems and malfunctions. The common problems include sticky buttons, disappearing text, and keys not working. But, luckily, you do not have to discard or replace your surface keyboard if it malfunctions. There are a number of ways that you can use to rectify the problem and continue using the keyboard without any issues....

Given how important this tool is, you can take no chances on its quality and there should NOT be any compromises on picking the best clamp meter. In this article, we are going to list down some of the best digital clamp meters there are and we have curated this list based on a few key factors such as Safety: Safety is the utmost and top factor that you need to check for in a clamp meter....

Number of Lugs: Just like any other soldering component, you will run out of lugs pretty fast after working on a few circuits. Thus, almost all of them come in a pack of multiple lugs. While budget options may include 6 or 10 lugs, higher-end ones even come with 60 lugs in much larger pack sizes. Gauge: The gauge rating tells you about the thickness of soldering lugs that you are using....

Apart from the consistent thickness, they provide a smoothened finish on the surface of different pieces of wood after cutting, which is quite useful in making several projects like level tabletops, joinery, and others. Here is a quick outlook on the key factors to consider before investing in the benchtop planer. Motor Power – The motor power should provide adequate power to perform the work. However, the amount of power required depends on the particular projects you are dealing with....

Number of Tools: As you would expect from a tool set, it is going to include multiple tools in the box. Due to this, checking the number of tools included in the box is quite important to ensure that you will not have to buy more tools later on. While basic tool sets come with 6 or 7 tools, higher end models can even come with 12 or 25 tools depending on the model that you get....

Traditionally, most portable generators are either gasoline powered or diesel powered. But lately, the Propane (a type of LPG – Liquified Petroleum Gas) powered Portable Generators are also becoming common. To be fair, such Propane Generators are in fact dual fuel type generators i.e., they run on gas as well as propane. If you want to have a power source during a power cut or just want to power your electric devices in a remote location, then having a propane generator is the best option for you, especially, if you do not have ready access to gas pumps....

But due to thin dimensions, installing a webcam over the laptop can be difficult. So, you will be needing a sturdy webcam stand or tripods. They help to safely install the webcam and ease up the maneuverability. The stand holds the webcam in its place and enhances the viewing area for a better live stream. With the availability of various models, it is not an easy task to choose the correct option....

Talking about the specifications, the Toshiba Excite Go is fitted with a 7 inch display that packs a resolution of 1024×600 pixels and is fueled by the latest iteration of Android – v4.4 KitKat out-of-the-box. Powering the device is a quad-core Intel Atom processor that can deliver decent performance. While the Toshiba Excite Go packs 16 GB of onboard storage capacity that can be expanded up to 128 GB with the help of a micro SDXC card....

This router manages the 1300 Mbps Wireless AC band for the fastest wireless available and the 450 Mbps Wireless N band to connect with the common wireless devices. Needless to say, Wi-Fi Protected Setup (WPS) wizard connects other WPS supported wireless adapters with ease. You can also create a secure isolated guest network for guest internet access with restrictions. Mr Atul Jain, Country Manager at TRENDnet India said, “TEW-812DRU, AC 1750 dual band wireless router is one of the best in wireless networking hardware product....

Underwater welding was invented in 1930 for constructing and repairing marine structures, bridges, dams, and seacrafts. Besides, underwater welding is extremely popular among projects related to pipelines, ships, and oil rigs. Even nuclear power plants involve certain underwater welding tasks. In this article, we will explain everything you need to know about underwater welding. What Is Underwater Welding? Underwater welding refers to the process of welding performed in a wet environment....

The seven-inch tablet Videcon VT71 running on Android 4.0 Ice Cream Sandwich has got a 3200 mAh battery with which you can enjoy 5 hours of Web, Video of more than 7 hours and stand by of around 15 days. This tablet got a Rectangular shape with curve edges as shown in the above pic. This tablet is 12.5 mm thick, with weight of 181 grams. Here you can observe that in the top left hand side there is a camera provide....

A Laser Diode is a semiconductor device similar to a light-emitting diode (LED). It uses p-n junction to emit coherent light in which all the waves are at the same frequency and phase. This coherent light is produced by the laser diode using a process termed as “Light Amplification by Stimulated Emission of Radiation”, which is abbreviated as LASER. And since a p-n junction is used to produce laser light, this device is named as a laser diode....

There is a subcategory of metals called white metals, which are known to be considerably hard to weld. Today, we are going to take a deeper dive into the concept of white metals and the most efficient way to weld them. In this guide, we will explain white metals, their properties, their welding method, and some important aspects that can alter the quality of white welding. So, make sure you stay in touch until the end of this guide....