Class AB Audio Amplifier | HACK A WEEK This week we’ll take a look at another type of audio amplifier, the class AB amp. As we saw in Hack #19 the class A amp has a transistor that is biased with a voltage that makes it essentially stay turned on all the time. This single transistor handles the entire waveform both positive and negative. This project is fairly easy to build and all the parts are readily available. Keep on hackin! Parts list: 2 – 2N3904 NPN transistors 1 – 2N3906 PNP transistor 1 – 47 uF electrolytic capacitor 1 – 470 uF electrolytic capacitor 1 – 100K ohm resistor 1 – 1K ohm resistor 2 – 1N4148 diodes Schematic: Natural Pools or Swimming Ponds Natural Pools or Natural Swimming Ponds (NSPs) Let nature clean the water... Chemical-free water garden and swimming pool. The plant portion, or regeneration zone, is separated from the swimming area by the wall seen a few inches below the water’s surface. www.naturalswimmingpools.com The pools have skimmers and pumps that circulate the water through the regeneration zone and back into the swimming area. There are many options as to design. A gradual slope contains the plants, gravel and loamy sand, a wall keeps them separate from the swimming area. Vacuum but twice a year and tend to the plants as needed. The regeneration zone can be along the perimeter of a natural pool or a pond unto itself but connected to the swimming area. www.gartenart.co.uk For a true natural pool with no help from ultraviolet light or other such technology, the requirement is half swimming area, half regeneration area. www.biotop-natural-pool.com Plants steel the nutrients away from algae. www.gartenart.co.uk
Browse like Bond: Use any computer without leaving a trace with Tails - Gadgetbox on msnbc.com If James Bond logs on to a computer, he doesn't want to leave a bunch of files, cookies, or his IP address out there for someone to find. It might seem extreme, but sometimes it's a good idea to take the same precautions yourself. In this post, we'll walk through how to use a USB stick or DVD to anonymize, encrypt and hide everything you do on a computer no matter where you are. When we say "browse without leaving a trace", we truly mean it. Tails is a portable operating system with all the security bells and whistles you'll ever need already installed on it. What Tails Is and What's Packed Into ItThe magic of Tails is that you don't have to do a lick of work: once you create your boot disc you'll have a completely anonymous, totally private operating system preloaded with all the software you (or James Bond) would need. Built-in online anonymity: The key feature that's going to appeal to most people is Tails' built-in online anonymity. Step 1: Download the Necessary Files
Online Sample Sales | Find the Latest Online Sample Sales on SheFinds Online sample sales are one of the best phenomenons to ever happen in online shopping. Get great sales and deals with these daily online sample sales. We’ve compiled a list of the best online sample sales, so you don’t have to scour the web (or your inbox). Here, you’ll find the best online sample sales, as well as sample sale invite codes, so you barely have to do anything. Just shop! Get thinner, fitter, and naked-er for summer! more crazy good deals! online women's sample sales Raise is the first peer-to-peer gift card marketplace where consumers can buy discount gift cards from popular brands or sell unwanted gift cards for cash. Discover fashion and lifestyle collaborations among top designers, media figures and tastemakers. A new kind of retail experience, one that exists 100% online and bypasses all the middlemen to create beautiful designer goods, always under $100. This site features sales from 10 high-end designers (as well as luxury home lines) a day, 7 days a week.
10 Futuristic Materials Lifeboat Foundation Safeguarding Humanity Skip to content Switch to White Special Report 10 Futuristic Materials by Lifeboat Foundation Scientific Advisory Board member Michael Anissimov. 1. Aerogel protecting crayons from a blowtorch. This tiny block of transparent aerogel is supporting a brick weighing 2.5 kg. Aerogel holds 15 entries in the Guinness Book of Records, more than any other material. Carbon nanotubes are long chains of carbon held together by the strongest bond in all chemistry, the sacred sp2 bond, even stronger than the sp3 bonds that hold together diamond. “Metamaterial” refers to any material that gains its properties from structure rather than composition. We’re starting to lay down thick layers of diamond in CVD machines, hinting towards a future of bulk diamond machinery. Diamonds may be strong, but aggregated diamond nanorods (what I call amorphous fullerene) are stronger. Transparent alumina is three times stronger than steel and transparent. inShare28 Materials
C language - Simultaneous button push & Switch Like the example you provided of 157 where it's sent as '1' '5' and '7' is there a way to put all three of those in one element? Yes and no. If by one element, you mean something like an int, then, no, not directly. If by one element, you mean an array of chars, then, yes. We need to go back to your original question. I am trying to read inputs from Serial.read(). Where is this data coming from, and what triggers that source to send data? Serial data transmission is asynchronous. It also means that the sender needs to present the data in a way that the receiver can tell how to deal with the data it receives. If the sender is going to send 4 values, 157, 213, 101, and 89, as characters, and includes no separators, the data stream will look like this: "15721310189". Given a stream like that, it is impossible to reconstruct the data from the sender. If the data is sent like "157;213;101;89;" instead, then the receiver has a hope of reconstructing the data.
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Change the Windows 7 Login Screen Background Image When you login to your Windows 7 computer (assuming you haven’t used something like this tutorial to turn on automatic login), you’ll generally see a login window with a background looking something like this. It’s fine; there’s nothing wrong with it. But sometimes a change is good so in this article we’ll show you how to change the background image behind the login screen to anything you want. The first step is to open up the Start Menu by clicking the orb in the lower left corner of the screen. Now, in the Start Menu search box, type regedit, to open up the Registry Editor. When the Registry Editor appears in the Start Menu, click the Enter key to launch it. Now, right-click on the HKEY_LOCAL_MACHINE folder, and choose the Find option. The search window will appear so perform a search for OEMBackground. Note: it’s possible that OEMBackground doesn’t exist on your system; if this is the case, adding a new DWORD value with the name of OEMBackground will fix things.
Alibaba Discounts TVs to Woo 193 Million Chinese Online Alibaba Group Holding Ltd. is taking a new approach to boosting sales online: paying its customers to cut their prices. China’s biggest e-commerce company plans to spend 300 million yuan ($47 million) on summer promotions for goods ranging from iPhones to televisions to air-conditioners sold through its Tmall. The website, which operates a marketplace similar to EBay Inc. (EBAY:US)’s, is subsidizing its vendors’ deals for their customers. The program steps up Alibaba’s battle with online rivals 360Buy.com and Tencent Holdings Ltd. (700) for China’s Internet shoppers, estimated at 193 million by Boston Consulting Group. “They are taking money out of their own pockets and helping clients slash their prices to steal users from 360Buy,” said Michael Clendenin, managing director of research company RedTech Advisors. Under the program, which is focused on electronics, vendors on Tmall can apply to the Alibaba unit for subsidies to make up for discounts. “Copycats never survive,” he said.