background preloader

How to Make a Crystal Radio in 10 Minutes

How to Make a Crystal Radio in 10 Minutes

http://www.ehow.com/how_7673227_make-crystal-radio-10-minutes.html

How to Build a Robot Tutorial - Society of Robots Introduction to Gears No good robot can ever be built without gears. As such, a good understanding of how gears affect parameters such as torque and velocity are very important. In this tutorial I will first talk about the basics of gears, how to use them properly along with simple equations, and then I will go into specific types of gears. Mechanical Advantage, Torque vs. Rotational Velocity Gears work on the principle of mechanical advantage. This means that by using different gear diameters, you can exchange between rotational (or translation) velocity and torque. Electronic Projects For Beginners I made a guide for those people who are still starting with their electronics hobby. I started connecting wires, batteries, bulbs, buzzers and motors when I was 4 years old . Now that I am 13 years old, I now have a good amount of experience to build complicated electronic circuits. Learning electronics isn't that easy but if you put love and passion to it, I assure you that you would enjoy building your own experiments. It takes years of jamming parts, soldering, gluing projects to become a good hobbyist. By fulfilling these projects that where shared by different Instructable members, I can assure you, with a little bit of passion and practice, you could become successful with your future experiments and inventions.

What 5 Things can You Do to Change the System? A few weeks ago a reader on this blog asked me an interesting question that I have been mulling over for some while: can I list 5 things everyone needs to do to change the system? It’s a tall order, but I decided to give it a bash. I don’t plan to prescribe anything here, and no one should take my word for it as I’m no paragon of purism. Trinity College of Biblical Studies-Tuition Free Online Ministry Degree Trinity College of Biblical Studies is a Tuition free Bible College. All the class material is free and online. All the requirements for the classes are in the class syllabus or the first page of the class.

Build Your Own Server Why pay somebody to do it for you when you can build it yourself! [global] panic action = /usr/share/samba/panic-action %d workgroup = "Name" netbios name = "Server name" invalid users = root security = user wins support = no log file = /var/log/samba.log log level = 3 max log size = 1000 syslog = 1 encrypt passwords = true passdb backend = smbpasswd socket options = TCP_NODELAY dns proxy = no passwd program = /usr/bin/passwd %u passwd chat =*Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX\spassword:* %n\n . obey pam restrictions = yes pam password change = no null passwords = no #Share Definitions [homes] comment = Home Directories browseable = yes writable = yes security mask = 0700 create mask = 0700 #!

How To YouTube Your Way to Van Gogh Level Skillz Whether you’re getting your bachelor’s degree in painting, graphic design or sculpture, there’s so much to learn about art — from its lush history to materials — that it can sometimes feel overwhelming. Yet art students shouldn’t fret. There’s a whole lifetime ahead to learn and numerous resources both in the classroom and outside of it for expanding your knowledge. One great place to seek out help with becoming a better artist is on YouTube. Vehicle for Training Lay Leaders Christian Leaders Institute Christian Leaders Institute World Head Quarters 700 Washington Street Suite 260 Grand Haven, Michigan 49417 Corporate Phone Number 616-777-0305 Customer Service Requests or difficulty in making an offering or donation need to be submitted in writing in order to serve you better . Login at your student account and click the Help Desk button to share your problem. If you cannot login email: helpdesk@christianleaders.net.

Build a Laser 3D Printer - Stereolithography at Home Here is how to make a Stereolithography 3D Printer. It is still a bit of a work in progress but so far it is working pretty well. This is mainly an experiment which started as a Delta Robot Stereolithography Printer but ended as a more traditional Cartesian Stereolithography Printer.

Wimoto motes - Your Sixth Sensor Wimotos are a family of small, wireless sensors for your iPhone, iPad, Android, Linux or Raspberry Pi device that measure environmentals such as ambient temperature, humidity, light, soil moisture, soil temperature, object temperature, human presence and movement. They last for about a year on a single battery and don't require an Internet connection to work. You can upload your data to our cloud service for analysis via our free app, or use the optional Wimoto Cloud Cube to do it for you in realtime via Wifi. Instead of launching a weather app, wouldn't it be nice to know what the weather right outside your home is right now? Or if it's too dry or cold at night in your baby's bedroom?

25 Amazing Benefits & Uses For Hydrogen Peroxide Hydrogen peroxide is the only germicidal agent composed only of water and oxygen. Like ozone, it kills disease organisms by oxidation! Hydrogen peroxide is considered the worlds safest all natural effective sanitizer. It kills microorganisms by oxidizing them, which can be best described as a controlled burning process. When Hydrogen peroxide reacts with organic material it breaks down into oxygen and water.

World History: The Best Online Courses To Learn From In college, history was my least favorite subject. Every semester, I avoided the world war seminars and the ancient history lectures — that is, until I took Stephanie McCurry’s History of the Slave South. McCurry, like all excellent history professors, was able to make the past come alive for our class, focusing on a compelling narrative that doesn’t receive enough attention: the history of enslaved labor in the United States. McCurry’s class teaches the inherent value of studying history: If we don’t, we run the risk of forgetting important (often difficult) stories. And when we do, we come away with a fuller understanding of what it means to be human.

How to Make a Three-Pendulum Rotary Harmonograph A harmonograph is a mechanical device that uses swinging pendulums to draw pictures, believed to be originally invented in 1844 by Scottish mathematician Hugh Blackburn. This 3-pendulum rotary type of harmonograph gives a wide variety of pleasant results, and is fairly easy to build once you've settled on a design and have acquired the appropriate materials and tools. This is a great project to do with kids and can result in endless experiments creating new types of geometric designs. Skip to More Results and Movie Two lateral pendulums swing back and forth at right angles to each other with arms connecting to a pen. One moves the pen from side to side, and the second moves it from front to back on the paper.

DIY Polygraph Machine: Detect Lies with Tin Foil, Wire and Arduino DIY Polygraph Machine: Detect Lies with Tin Foil, Wire and Arduino Lying is awesome. From a very young age, children learn that flat out denying the truth gets you out of trouble and helps keep you calm in the face of horror. But what happens when you just have to know if someone, say, used your toothbrush? You could ask them to take an expensive and arduous polygraph test.

10 theories that explain why we dream Kinja is in read-only mode. We are working to restore service. I like #7 and #8 of sorts, as they sort of fit in with the kinds of dreams I have.

Related: