Programmable Power Supply Using OPA548

Project provides 1.2 to 20V DC output with current limiter adjustable to 0-5A. I have tested the circuit with 250mA output without a heat sink. Project is capable to drive 3A continues load and 5A peak, large size heat sink required for full load. The tiny power supply based on low cost OPA548 high-voltage and high-current operational amplifier is ideal for driving a wide variety of loads. The project provides excellent low-level signal accuracy and high-output voltage and current. The circuits operate with single supply 24V DC and logic supply 5V DC. The IC is internally protected against over-temperature condition and current overload. Trimmer potentiometer PR1 sets the output voltages, PR2 helps to set the current limit 0 to 5Amps.
Programmable Power Supply Using OPA548 – [Link]

Bomist – Parts Inventory and BOM Management for Electronics

It all started a few years ago with Component Organizer, than BOMER and it’s now called BOMIST. The software runs locally, so no server nor setup required and you can have as many databases as you want (just run as many instances of BOMIST as you want). Additionally, it is integrated with Octopart, meaning you get plenty of useful real-time data: datasheets, descriptions, package names, values, prices as well as other useful information are automatically fetched online. Also, importing data into BOMIST is VERY easy which means you’ll get up and running in no time. BOMIST will keep improving, many new features are already inline and your feedback is always greatly appreciated. Give it a try, it’s FREE.

Volterman, Your Personal Smart Wallet

With the rapid growth of technology, smartphones and e-payments are replacing cards, cash, and wallets. However, developers are still trying to keep wallets relevant in the 21st century, and Volterman is the newest attempts. Besides WiFi hotspot and power bank, Volterman also provides novel security features to protect your phone and wallet from loss.

Similar to other smart wallets, Volterman has a GPS tracking capability, so you can find it easily in case it lost. Through Bluetooth connectivity, it connects to the smartphone to ensure that you will not forget one of them. An alarm will start ringing to notify you and pick up what you have missed.

The new innovative idea on Volterman is a small built-in camera. It captures everyone trying to open the wallet while “lost mode” is running. The pictures are sent directly to the paired smartphone, meaning that you will know who is using your wallet and where is he. With an embedded SIM card, you are also able to track your wallet via the website.

Volterman’s Embedded System Specification

Inside the wallet, there is a full computing system to do all the stuff. The main components are:

  • CPU: ARM Cortex A9
  • Memory: 512MB RAM, and 32GB ROM
  • SD card: 64GB embedded card
  • Bluetooth: 5.0
  • Camera: 4MP
  • Mobile Network: Worldwide 2G, 3G
  • Wi-Fi: 802.11 BGN, Hotspot
  • GPS: A-GPS, GLONASS
  • Connector: magnetic connecter by Volterman
  • Power Bank: 2000mA, 2600mA, 5000mA, in addition to the capability of wireless charging.
  • Input voltage: 5V, 1A
  • Output voltage: 5V, 500mA

An interesting point is that the purchase price is covering the data charges for the GPS tracking and sending of photos to the Volterman server. According to the makers, Volterman will automatically connect to local networks in 98 countries, but at the moment the exact tariffs from country to country are unclear. However, it is offering up to 3 times cheaper internet cost than the regular price, with an early estimate of around $15 per 1 GB.

The Volterman comes in three different sizes: a small cardholder model $98 with 2,000-mAh power bank, a conventional bifold wallet $135 with 2,600-mAh power bank, or a larger travel size $157 designed to hold more cards, a passport and with a 5,000-mAh power bank.

After reaching more than one million dollars on IndieGoGo, Volterman is now ready for mass production and estimated to start shipping and the first quarter of 2018.

Take a look at the crowdfunding campaign video below:

Proto Board Power Supply

David Johnson-Davies @ technoblogy.com build a breadboard friendly power supply to power your Arduino or other low power electronics. The power supply is able to deliver 0V to 5.5V at up to 0.5A and it’s powered from two Li-Ion rechargeable batteries. The output can be adjusted using a rotary encoder, and the voltage is displayed on a three-digit 7-segment display. The whole circuit is controlled by an ATmega328.

72 Channels Serial To Parallel Driver Board Using 74HC595 & ULN2803

72 channels Serial (SPI) to parallel driver board has been designed for various applications. This project can be used as multi Solenoid driver, large size 7 segment display driver, bar graph driver, and LED driver. The project works with 5V logic levels. Output load supply 12V-48V DC and each output can drive 500mA load.

I have used 3 digits 2.3Inch 7 segment displays as an example, this board can handle up to 9 digits. The board can serve many applications like, Stop Watch, digital timer, counter, score board, token display and lot more.

Project built around 74HC595 and ULN2803 ICs, The 74HC595 devices contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has parallel 3-state outputs. Separate clocks are provided for both the shift and storage register.

72 Channels Serial To Parallel Driver Board Using 74HC595 & ULN2803 – [Link]

LCR-Reader MP: the Ultimate PCB Debugging Tool

With LCR-, ESR-meter, AC/DC Voltage/Current meter, Oscilloscope and Signal Generator this device covers all needs for low frequency PCB debugging.

LCR-Reader-MP recently released by Siborg Systems Inc. which joins the LCR-Reader family of handheld LCR- and ESR-meters, offers users unprecedented functionality for testing circuits and components and a record high basic accuracy of 0.1%.

The IEEE International Electron Devices Meeting (IEDM) is an annual nano- and microelectronics conference held in December since 1955. The scope covers technological breakthroughs in the areas of semiconductor and related device technologies, manufacturing, design, modeling, physics and circuit-device interaction.

Digital Multimeter LCR-Reader-MP is a continuation of the LCR-Reader line of products and features a design of combining a lightweight multimeter, and LCD display and a set of tweezers with gold-plated probes. The device is controlled using a jog-wheel navigation similar to the one used in the original Smart Tweezers ST-1. The new device offers more measurement features than any other tweezer meter uo to date. These features include: oscilloscope mode, LED/diode measurements, AC/DC voltage measurements, continuity testing, pulse counting, signal generator, super large capacitance measurements, etc. Most importantly it offers the ability to test at 100 kHz test frequency that allows for a 0.01 pF resolution for capacitance and 1 nH resolution for inductance.

FastCAP Launches a Chip Ultracapacitor

FastCAP Systems has launched its latest product – a board mountable chip ultracapacitor. This new product offering is the first low ESR, thin-profile, reflowable ultracapacitor on the market and is now available for purchase in FastCAP’s online store.

This chip ultracap has the highest energy density of any board-mountable ultracapacitor. The sealed ceramic package is pick and place compatible, RoHS compliant and Pb-free reflow compliant.

The supercapacitor provides maintenance free storage in a small form factor, perfect for thin devices that require reliability and long lifetime at high temperatures (up to +85°C). This new technology is well suited for applications such as power loss protection for solid state drives, power buffering for lithium-ion batteries, and auxiliary power supplies for peak and pulsed power, wireless sensors, and energy harvesting.

Banana Pi M2 Magic, Smallest Banana Pi Board

Sinovoip had announced its new board Banana Pi M2 Magic. At first, it is an ARM SoC development board that features a high computing performance in a 51mm square portable design. In addition to onboard WiFi and Bluetooth, M2 Magic offers 8GB eMMc storage and DDR3 SDRAM of 512 MB. There is also an SD card slot for more storage, to install an OS for example.

Banana Pi M2 Magic

Banana Pi M2 Magic specifications:

  • SoC: Allwinner R16 or Allwinner A33, quad-core ARM Cortex-A7 processor with ARM Mali 400 MP2 GPU
  • System Memory: 512MB DDR3
  • Storage: 8 GB eMMC flash (option: 16, 32 or 64GB) + micro SD slot
  • Display Interface: 4-lane MIPI DSI connector
  • Camera Interface: CSI connector supporting up to 5MP sensor, 1080p30 H.265 video capture
  • Video Decoder: Multi-format FHD video decoding, including Mpeg1/2, Mpeg4, H.263, H.264, etc H.264 high profile 1080p@60fps
  • Audio: Onboard microphone
  • Connectivity: Wifi 802.11 b/g/n, Bluetooth 4.0 LE (AP6212)
  • USB: 1x USB 2.0 host, 1x micro USB 2.0 OTG port
  • Expansion: 40-pin header with GPIOs, UART, I2C, SPI, PWM…
  • Misc: Reset & power buttons, RGB LEDs,
  • Power Supply:
    • 5V @ 2A via DC power barrel
    • 3.7V Lithium battery support
  • Dimensions: 51 x 51 mm
  • Weight: 40 grams

Alongside the processor and the memory at the front side of the board, you will find a 40-pin GPIO header, a DSI display slot, an Antenna connector, a CSI camera slot, a USB OTG adapter, a USB2.0 port, a microphone and a DC power jack. On the rear side, there is an antenna, a PMIC AXP223, a battery interface and a microSD card slot.

Front and rear sides

This board is oriented for IoT applications in general. Since there is no HDMI interface, M2 Magic is suitable for headless use, or you can use the MIPI DSI display interface to connect a screen. It also doesn’t have an Ethernet interface, so you will have to use WiFi and Bluetooth connectivity.

The board will run Tina IoT Linux, which is a lightweight Linux distribution optimized for Allwinner R-Series processor.

Tina IoT Linux

Both A33 and R16 versions are available in the market. A33 version is for $23, while R16 is for $28. You can get it from any global distributor or cooperative partner of Banana Pi products. Finally, you can reach more information and data at the official wiki.

High Voltage Capacitor Charger for Photo-Flash Using LT3751

The project is built for professional photo flash systems. Circuit generates high voltage from low voltage battery to operate a photo-flash tube. The project can also be used in other applications like high voltage capacitor charger, emergency strobe, high voltage power supply, security, detonators etc. LT3751 is the heart of the project.

The LT3751 is a high voltage input flyback controller designed to rapidly charge a large capacitor to a user-adjustable high target voltage set by the transformer turns ratio and three external resistors. Optionally, a feedback pin can be used to provide a low noise high voltage regulated output. The LT3751 has an integrated rail-to-rail MOSFET gate driver that allows for efficient operation down to 4.75V.

High Voltage Capacitor Charger for Photo-Flash Using LT3751 – [Link]

Imagina Book, For Augmented Reality Education

Virtual reality and Augmented reality became essential technologies these days. They have an important role in making products much exciting and entertaining, especially in education. Recently, Livit Studios announced its new augmented reality book series “Imagina Book“.

Imagina Books is an educational book series that converts the classic and traditional book into an interactive and 3d visualized. It provides a new reading and learning method which leads to better understanding and also more enjoyable experience for kids.

Imagina consists of two components, a mobile application, and a printed booklet. Using the app is easy, so the kid in only need to put the camera on a page and then an interactive animated 3D model will appear on the screen.

This technology can cover most of the scientific topics by making some customization to the app and print a new book. However, the first book of the series is about the human body, and Livit had launched it through a kickstarter campaign. It is a journey inside the human body allows kids to explore their body organs and functions with an interactive augmented reality experience. Below I will talk more about the book and the application.

Imagina Book Features

The book is a hardcover 32-page booklet for children from 8 to 12. It is designed to be attractive for kids and to have a substantial amount of science on its own. It also consists of several sections, each one talk about a system in the human body.

Sarah and Adam are two friendly characters who will take the learners on a journey to explore their body. They make the learning experience more friendly and enjoyable for kids. In addition, the printed book is a high quality and colorful, to make sure that kids will love it.

Imagina Book App Features

The app is compatible with both IOS 9 and above devices, and Android 5.0 and above devices. Inside the app, the “gamification” process is one of the main aspects of the learning process. The 3D games include levels and achievement goals to help the learner develop a sense of competition among his peers and friends.

Main features of Imagina book app:

  • 3D Models Overlay
    The app simply adds another dimension to the 2D conventional world of books. It overlays 3D models of each organ or system on each page of the book.
  • Organs Animation
    Each model is a realistic rendering of the body organs and systems with accurate animations that portray the functionality of each organ.
  • 3D Info Labels
    The user can inspect the anatomy of the human body organs with the help of accurate 3D labels for each part of the organ.
  • Interaction
    The user can interact with 3D models by resizing and rotating them to better visualize each organ.
  • Screenshot & Share
    The user can take screenshots from the application anytime and share these shots via social media.
  • In-Game Currency
    You gain coins when you finish each level. You use coins to build your own in-game hospital.
  • 3D Games
    For each organ, they made a customized 3D interactive game in which Sarah and Adam help the learner identify the basic anatomy of the organs.

Although there are still 17 days remaining for the kickstarter campaign, Imagina Book achieved their goal of $9,000. And with $21, you can pack your early bird copy of the human body book, while the original copy is available for $25.

More details and information can be found on the official website.