Zener Diode Circuits and Applications - a summary or tutorial covering the essentials of the Zener diode or voltage reference diode used in many power supply and other circuits. Zener diodes are used in many circuits in a variety of ways. The most common Zener diode circuit is one in which the Zener diode is used as a voltage reference element. This type of circuit uses the constant voltage as a reference in one of a variety of forms of power supply circuit. There are other Zener diode circuits and applications. Simple Zener diode ciruit for voltage regulator When used in a regulator cirrcuit, the Zener diode must have the current entering it limited. In a practical circuit, the simplest form of current source is a resistor. Simple circuit of a Zener diode shunt regulator The value of the series resistor is simple to calculate. Resistor value (ohms) = (V1 - V2) / (Zener current + Load current) Where: V1 is the input voltage V2 is the Zener diode voltage Zener diode circuit for PSU with series transistor Circuit tips By Ian Poole
Troubleshooting and Repair of Consumer Electronic Equipment Including: Test Equipment, Supplies, Parts, Incredibly Handy Widgets(tm), Sources of Information, and Where to Find Broken Stuff Version 2.47 (21-Feb-12) Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: This notice is included in its entirety at the beginning. There is no charge except to cover the costs of copying. Table of Contents Preface Author and Copyright Introduction Getting Into Troubleshooting Comments on How to Learn Repair THE Question: To Repair or Not to Repair If You Decide That You Don't Want to Bother Repairing Something Smoking Around Electronic Equipment General Safety Considerations Basic Troubleshooting Some of My Rules of Troubleshooting Some Quick Tips or Rules of Thumb On-Line Tech-Tips Databases Getting Inside Consumer Electronic Equipment How to Build Obsolescence In Before the Name Goes On Tools, Test Equipment, and Other Stuff Hand Tools Emergency Screw Removal Plastic Screw Thread Repair Workbench and AC Power Adhesives
Mike's Electric Stuff Concise electronics for geeks Copyright (C) 2010 by Michal Zalewski <lcamtuf@coredump.cx> There are quite a few primers on electronics on the Internet; sadly, almost all of the top hits resort to gross oversimplifications (e.g., hydraulic analogies), or convenient omission, when covering subtle but incredibly important topics such as the real-world behavior of semiconductors. There are some exceptions, to be sure - but they tend to suffer from another malady: regressions into mundane, academic rigor, complete with differential equations and complex number algebra in transient analysis - a trait that is highly unlikely to be accessible, or even useful, to hobbyists. The physics of conduction [link] As you probably recall from your school years, the dated but still useful Bohr model of the atom explains that atoms consist of a dense center (nucleus) with a variable number of protons and neutrons. The strongly bound and heavy nuclei of stable isotopes do not undergo any structural changes under everyday circumstances.
Learn Bil Herd’s DIY Surface Mount Assembly Process You can do your own Surface Mount Technology based PCB assembly with just a handful of tools and some patience. At the heart of my SMT process is stopping to inspect the various steps all while trying to maintain a bit of cleanliness in the process. Surface mount or Surface Mount Technology (SMT) is the modern way to assemble Printed Circuit Boards (PCB) and is what is commonly seen when opening a modern piece of tech. It’s much smaller than the older Through-Hole (TH) technology where the component leads were inserted into holes in PCB, and act we called “stuffing” since we had to stuff the components into the holes. A few specialized tools make this a lot easier, but resourceful hackers will be able to pull together a solder paste stencil jig, vacuum tweezers, and a modified toaster oven with a controller that can follow the reflow profile of the solder paste. Component Size Matters Surface mount package names can be a little bit confusing. Caring for Solder Paste Applying the Solder
How to Succeed in a Massive Online Open Course (MOOC) by Apostolos Koutropoulos & Rebecca J. Hogue “MOOCs provide a new methodology and modality for teaching and learning. This newness does pose some problems for learners, but also provides for exciting new possibilities. MOOCs require learners to be more proactive in their education and in building their personal learning networks (PLNs). Everyone can be successful in a MOOC, provided that certain steps are taken and strategies devised before, during, and after a MOOC.” In the past couple of years, massive online open courses (MOOCs) have become a trend among many members of the educational online community. This is particularly true of faculty who are interested in open educational resources. The structure and design of each MOOC varies. A learning management system such as Moodle or BlackboardOnline groups such as Yahoo or Google groupsAn aggregation of various distributed platforms, such as blogs and Twitter, or using gRSShopper (pronounced grasshopper) Before a MOOC starts Review the website Consider time During a MOOC Participation
Catalog of 150 open-spec, community-backed Linux SBCs under $200 Our 2021 catalog of 150 open-spec, maker-oriented SBCs that run Linux or Android provides updated prices and descriptions plus a comparison spreadsheet of major features. The following summaries of 150 community-backed and predominantly open-spec Linux/Android hacker boards under $200 are listed in alpha order. They list specs and lowest available pricing recorded in the last two weeks of December 2020 with products either shipping or available for pre-order with expected ship date by 2Q 2021. Please also check out our introduction article covering the latest community-backed SBC trends (see link below). Alphabetical index: Low-power Arm hacker board classic keeps it fresh with add-onsCompany/project — OlimexProduct pageProcessor — Allwinner A20 (2x Cortex-A7 @ 1GHz); Mali-400 GPUMemory — 1GB DDR3 RAM; opt. 8GB eMMC, 8GB NAND, and 16GB eMMCPrice — $49 (40 Euros); 48 to 60 Euros ($73) for ext. flash versions Arduino returned in 2018 with a reboot of its original, MIPS-based Arduino Yun.
Raspberry Pi: Tutorials, Models, How to Get Started With more than 34 million units sold, the Raspberry Pi is not only one of the world’s most popular computers; it’s also one of the most important. Originally designed to help kids learn about technology, this inexpensive single-board system is the leading choice for makers, developers and hobbyists who want to do everything from building industrial robots to setting up retro arcade machines. Whether you’re eight or 80, if you love technology, the Raspberry Pi is made for you. And with models ranging in price from $4 to $75, anyone can afford to buy one. Here’s what you need to know to make the most of Raspberry Pi. Choosing a Model and Getting Started with Raspberry Pi If you don’t own a Pi, you should definitely get one. The Raspberry Pi Pico series of boards (which includes the $6 Raspberry Pi Pico W) carries the Pi name but is a completely different kind of board. For every Pi model, except the Raspberry Pi Pico, you’ll also need: A microSD card of at least 16GB. Tutorials and Support
Welcome to our new website! - Raspberry Pi You’ll have noticed something a bit different when you visited Raspberry Pi this morning. As a lot of you know already, the Raspberry Pi family is actually made up of two organisations, both based in Cambridge, UK. There’s us: Raspberry Pi Trading: we’re the Computer People. We engineer, make, and sell Raspberry Pi computers. We also make a bunch of other stuff: including add-on boards, or HATs; microcontrollers like Raspberry Pi Pico; accessories like keyboards and power supplies; and books and magazines. Then there are our colleagues across the city: the Raspberry Pi Foundation. Up until now, we have all used a single website, raspberrypi.org, for all our content, whether that content was about our educational work or about Raspberry Pi computers. Raspberry Pi Computers Right now, you’re visiting raspberrypi.com, a completely new website from us, the Computer People, aimed at those of you who want to use or buy a Raspberry Pi or one of our other products. Raspberry Pi Foundation