Soundcard Scope Soundcard Oscilloscope deutsche Version Author: Christian Zeitnitz Main features: The PC based Soundcard Oscilloscope receives its data from the Soundcard with 44.1kHz and 16 Bit resolution. The data source can be selected in the Windows mixer (Microphone, Line-In or Wave). The frequency range depends on the sound card, but 20-20000Hz should be possible with all modern cards. The oscilloscope contains in addition a signal generator for 2 channels for Sine, Square, Triangular and Sawtooth wave forms in the frequency range from 0 to 20kHz. Download the latest version: scope V1.41 Obtain a commercial license here Interested in a customized version? Support the development of this program by obtaining a private donation license Additional features The program has completely been written in LabView (™ by National Instruments). Signal Sources The signals for the oscilloscope can be internal to the computer (MP3 player, function generator etc.) or from external sources (line-in, microphone). Downloads
Seeking Wisdom » resistor color codes As a teacher, I’m always on the lookout for new and interesting ways to promote learning in my classes. As a geek, its cool to find ways to do that with technology. I recently found out about an awesome website, Merlot.org, that serves as a place for teachers of all disciplines to share lessons and information. Nick Reeder, of Sinclair Community College in Ohio, has come up with some “Challenge” games that I really like: The Metric-Prefix Challenge helps students practice and learn their metric prefixes. Test equipment is essential to troubleshooting and observing electronic circuits. Understanding and remembering resistor color codes is critical to successful circuit analysis. Another very cool tool, from David Shaheen at Owen Community College, is the Resistor Placement Game. Tools like these are great for visual and kinesthetic learners, but they are fun for almost everyone!
Dr. Monk's DIY Electronics Blog Practical Physics This website is for teachers of physics in schools and colleges. It is a collection of experiments that demonstrate a wide range of physical concepts and processes. Some of the experiments can be used as starting-points for investigations or for enhancement activities. Many have links to carefully selected further reading and all include information and guidance for technicians. Physics is a practical science. Good quality, appropriate physics experiments and investigations are the key to enhanced learning, and clarification and consolidation of theory. We have published a new set of resources to support the teaching of practical science for Key Stages 3-5. Seeking Wisdom Get the Grammar Right I had a little meltdown this week after reading about 30 of those silly pictures on Facebook that people put the funny captions on… well, they would be funny if they were grammatically correct. I just couldn’t take it any longer, so I had to post a comment. Whether you are sending a text, posting on Facebook, or writing a paper for one of my classes, taking the time to keep your writing grammatically correct is important on multiple levels. Ohm’s Law Calculators Online Some students have problems visualizing the application of Ohm’s Law and the equations for voltage, current, resistance, and power. *The use of these tools to get homework and practice answers will not help make you smarter or promote understanding! Keep Track of Your Grades This MS Excel spreadsheet can be used to set and compute grades for all your classes! The directions are on the front page and its pretty self explanatory. Games for Learning Electronics Metric Number Line with Mnemonics Finally, M.
Make PCBs at home with magazine paper and your laser printer How to make PCBs at home in 1 hour & W I T H O U T special materials What you need You need also: a blade cutter, scotch tape, sandpaper, kitchen paper, cotton wool, vice, hacksaw. How it works Laser printers and photocopiers use plastic toner, not ink, to draw images. Finding the right paper The perfect paper should be: glossy, thin, and cheap. Paper preparation I discard pages heavily printed, preferring pages with normal-size text on white background. Printer setup Laser printers are not designed for handling thin, cheap paper, so we must help them feeding the sheets manually instead of using the paper tray. Printing Disclaimer: your laser printer is not designed to handle this kind of paper. This is my PC thermometer circuit printed on IEN magazine paper. How to cut raw material PCB material is fibreglass like, and a trick to cut it effortlessly is to score a groove with a blade cutter or a glass cutter. Cleaning the board for transfer Preparing for transfer Iron it! Peeling The hanger tool .
RESISTOR COLOR CODE CALCULATOR As can be seen in the above 4 Band Resistor Color Codes chart, the first two color bands have values of brown = 1, red = 2, orange = 3 and so on. The third color band is the multiplier of the first 2 bands. Here, black is 1, brown is 10, red is 100 and so on. Putting this in other words, the value of the third band (the multiplier) is the number 10 raised to the power of the color code. For example, red in the third band is 10² or 100. The 4th band is the resistor's tolerance and shows how precisely the resistor was manufactured. Now that we know the values of each color, let's try calculating a few examples of resistance values. Looking at resistor #1, we see the colors red red green gold. Resistor #2 has the colors orange orange yellow silver which "translates" into 3 3 ×10,000 or 330,000 ohms and a tolerance of 10%. Resistor #3 has the colors yellow violet silver meaning 4 7 ×.01 or .47 ohms and no fourth band indicates a 20% tolerance. Five Band Resistors Resistors In Parallel
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