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9 Mar 2015


Determine the power absorbed by the VCVS in the figure. Solution: The VCVS consists of an open circuit and a controlled-voltage source. There is no current in the open circuit, so no power is absorbed by the open circuit. The voltage vc across the open circuit is the controlling signal of the VCVS. The voltage Vc (across 2 ohm resisitor) measures vc to be vc = 2V. The voltage of the controlled voltage source is vd = 2 vc = 4V. The current in the controlled voltage source is 6V/4 ohm= 1.5A. The element current id and voltage vd adhere to the passive convention. Therefore, p = id*vd = (1.5)(4) = 6W is the power absorbed by the VCVS.

Power and Dependent Sources - [Link]

9 Mar 2015


Node-RED is a visual programming interface for the Internet of things. It doesn’t require coding experience, making it easy to connect your physical things to the cloud.

Node-RED is based on Node.js. The Node-RED application runs as a web server, and you customize and manipulate functional “flows” from any computer’s browser, local or remote. The server application can run on an inexpensive device like the Raspberry Pi.

Take Your Beans to the Cloud! LightBlue Bean Supports Node-RED, Brings Easy Creation of Internet-Connected DIY Projects Without Coding Experience

  • Provides Simple, Visually-Driven Project Development for Students, Hobbyists, Creatives, Prototypers
  • Interact with Low Cost Beans via Internet for Home Automation/Monitoring, Robotics, Class Projects, Art Installations, Point of Purchase Displays, More
  • Build Internet-Triggered Devices that Tweet, Post to Facebook

Introducing Node-RED - [Link]

9 Mar 2015


by 3dpburner.blogspot.com.es:

It is created with the same concept as RepRap, using 3D printed parts and some easy to find “vitamins” (non printed hardware).

I tried to make it as cheap as possible, by using cheap electronics and a “low power” laser (a laser diode).
The X/Y working area is fully customisable and the max working object height is up to 50-60mm.

The cutter/engraver basically uses the 3D printed parts, M8 and M3 size hardware (rods, nuts,washers and bolts), some small bearings and GT2 pulleys and belts. I got most of the parts from my “old” RepRap printer.

The X/Y working area is fully customsable by changing the length of the 8mm rods.

The electronics uses an Arduino UNO with a cheap CNC shield and two Pololu based stepper drivers to drive two NEMA17 stepper motors.

3dpBurner – A 3D printed laser cutter/engraver - [Link]

9 Mar 2015


by Rui Santos:

In this project you’re going to create a simple HTTP client with an ESP8266 WiFi module. Having your ESP8266 connected to your network, it requests the current Bitcoin price. This is an example on how to retrieve data from the web.

First, flash your ESP8266 module with NodeMCU

NodeMCU is a firmware that allows you to program the ESP8266 modules with LUA script. And you’ll find it very similar to the way you program your Arduino. With just a few lines of code you can establish a WiFi connection, control the ESP8266 GPIOs, turning your ESP8266 into a web server and a lot more.

Retrieving Bitcoin Price Using ESP8266 WiFi Module - [Link]

9 Mar 2015


by robertgawron.blogspot.com:

Old CRT monitor or TV is a great source of electronic components that can be used in DYI constructions. One of them is a flyback transformer that can provide 10-30kV output. The input voltage can be in a range from a couple of volts to over a dozen of volts, power consumption is a couple of watts. In my construction input voltage is 9V, power consumption is 5W.

A flyback transformer is driven by one or two transistors that should be also extracted from the same TV or monitor, those are high voltage transistors, that are hard to substitute and if bought separably can be expensive.

High voltage supply (10-30kV) made from CRT television flyback transformer - [Link]

9 Mar 2015


Anyone can build a robot quickly with this kit. We take care of all the wiring so that you can focus on making it uniquely yours. by Funnyvale:

Hackabot Nano is a very compact many-in-one plug-and-play Arduino Robot. The goal is to help everyone build a feature-rich robot without all the messy wiring. You simply connect the motors, plug in the sensors and controller and you may start programming. We even provide sample programs to help you get started.

In addition, a free Android app will be developed once we hit our stretch goal of $10000. With the app, even kids can navigate the robot with a smart phone or tablet.

Not into robotics? You can use this as a platform to build your Arduino based IoT (Internet of Things) devices as well.

Hackabot Nano: Compact Plug and Play Arduino Robot - [Link]

9 Mar 2015


by njneer.com:

I used to get the feeling that it wasn’t obvious enough that I really enjoy working with embedded systems. I decided to change that by designing a binary timepiece that is portable, easy to use, has long battery life, and has a very barebones “circuits and components” feel to it. After wearing the final product for about a month now, I feel like I was successful on all of those goals:

The Binary Wristwatch - [Link]

9 Mar 2015

KF5OBS writes:

DipTrace is a sophisticated schematic and PCB layout software. I had it installed on my computer for over a year but have never really used it. Since I needed a super simple PCB for some 78XX / 79XX type linear regulators, I decided to use this opportunity for my first steps with DipTrace.
DipTrace offers different prices for different packages. The cheapest version, DipTrace Starter (300 pins, 2 signal layers), is available for $ 75. DipTrace Full offers unlimited pins and unlimited signal layers for $ 895. All versions of DipTrace come with a humongous parts library and 3D models for a large amount of general purpose parts. In case a part or footprint is not included in the libraries, DipTrace offers both a component editor and a pattern editor for custom parts.
I needed a super small PCB for 78XX type voltage regulators. This mini project was perfect for my first steps with DipTrace. Please be aware that this article is going to be extremely coarse as it is supposed to be a general overview of the DipTrace software. The functionality of this software is rather complex as this is a professional design tool. More detailed articles will follow.

PCB layout design with DipTrace – An overview - [Link]

8 Mar 2015

Pacemaker from the1970s using 4000 CMOS!

Pacemaker teardown - [Link]

8 Mar 2015

What’s inside a 2000 vintage Globalstar GSP1600 Tri-Band Satellite Phone? Behold the Erectile Antenna, a helical designed extending antenna.

EEVblog #721 – Globalstar Satellite Phone Teardown - [Link]





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