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HV Nixie DC-DC Switching Power Supply

Nixie tubes need about ~180Vdc to light up and thus on most devices, a DC-DC converter is needed. Here we designed a simple DC-DC switching regulator capable of powering most of Nixie tubes. The board accepts 12Vdc input and gives an output of 150-250Vdc. The board is heavily inspired by Nick de Smith’s design.

Description

The module is based on the MAX1771 Step-Up DC-DC Controller. The controller works up to 300kHz switching frequency and that allows the usage of miniature surface mount components. In the default configuration, it accepts an input voltage from 2V to Vout and outputs 12V, but in this module, the output voltage is selected using the onboard potentiometer and it’s in the range 150-250Vdc. The maximum output current is 50mA @ 180Vdc.

The MAX1771 is driving an external N-channel MOSFET (IRF740) and with the help of the inductor and a fast diode, high voltage is produced.

MOSFET has to be low RDSon, the diode has to be fast Mttr, typically < 50nS, and capacitors have to be low ESR type to have good efficiency.

Precautions must be taken as this power supply uses high voltages. Build it only if you know what you are dealing with. Don’t touch any of the parts while in use.
Pay attention on the placement of C1 tantalum capacitor, as the bar indicates the anode (positive lead)

Schematic

Parts List

PartValueLCSC.com
R11.5M - 0805 SMDC118025
R310k 0805C269724
R45k trimmer SMDC128557
Rs0.05 Ohm - 0805 SMDC149662
C1100uF Tantalium SMDC122302
C2, C3100nF - 0805 SMDC396718
C44.7uF / 250V SMDC88702
C5100nF / 250V SMD 1210C52020
ICMAX1771 SO-8C407903
L1100uH / 2.5 AC2962892
Q1IRF740 D2PAK (TO-263-2)C39238
D2ES2F-E3, ES2GBC145321, C2844160
X1, X2Screw Terminal - P=3.5mmC474892

Oscilloscope Measurements

Yellow is the MOSFET Gate voltage and Green the output high voltage (~180Vdc). We see that the transistor switches with a low frequency of 146Hz and with a peak gate voltage of 12.8V
zoom in to the above short pulses reveals 3x pulses with 48.7Khz frequency to the gate of MOSFET. Also, the peak to peak ripple on output is 6V
further zoom to the output ripple reveals some short ringing and the peak ripple voltage.

Efficiency

The module’s efficiency is calculated for two output currents (50mA and 25mA) at 180Vdc voltage output and 12V input. In the first case, the Pout = 8.1W while the Pin=10.96W, so efficiency is calculated at 73.9%. In the second case, the Pout = 4.1W while the Pin=5.52W, so efficiency is calculated at 74.2%. We see that for lower currents efficiency is a little greater than for the maximum current of 50mA.

Gerber View

Photos

If you would like to receive a PCB, we can ship you one for 6$ (worldwide shipping) click here to contact us

MAX1771 Datasheet

Selpic offering Portable Printers at 20% discount on the eve of Father’s Day

Posted on by mixos

Selpic is popularly known for its Portable Printers across the globe. The company recently announced Selpic P1, S1, and S1 Plus portable printers at an affordable price while carrying useful features. To celebrate Father’s Day, Selpic is offering a huge discount on Selpic S1 and S1+ portable printer at the ongoing discount extravaganza. The Selpic S1 is available at the reduced price of $199 and S1+ is available for $239.

Both the handheld printers are a useful accessory that can help you to print text, images, QR codes, barcodes, graphics on any surface including wood, textiles, leather, ceramic, glass, walls, and carboards. These printers get easily paired with iOS and Android devices.

Selic S1 houses a 40ml ink cartridge and can print 900 A4 appears with 5% ink coverage. The intuitive app allows you to easily print any graphic easily by aligning at the correct position and size. It supports multi-line printing which improves the speed and enables the ability to print menus and guest lists easily.

Upon a single charge, Selpic S1 can work 6 hours non-stop and can remain on standby for 72 hours. It weighs only 260 grams.

There are slight changes in the Selpic S1+ including the larger print head of 1.0″ which enables to print at the speed of 20~300 mm/s. IN layman terms, you can slide and print within a second at this speed. However, it carries same 40ml ink capacity cartridge which can print over 900 A4 appears. The portable printer features a 1200 mAh battery which can provide 6 hours of continuous usage.

Both the printers are boon for the graphic designers, they can easily design and print the logos for better visualization.

The users can grab Selpic S1 and S1+ at a 20% discounted price of $199. Selpic has bundled the printers with Ink cartridge set and is offering them at different prices. The Selpic S1 0.5″ Print Head Quick-drying Handheld printer with a single Ink Cartridge set is available for $199.99 USD which usually retails for $289.9. Moreover, a single Selpic S1 Portable Printer Set with 3 quick-drying cartridges is available for $339.99 over the price over $459. The discount is applicable from June 17 to June 21.

Selpic S1+ with single Quick Drying Black Ink Cartridge is available for $239. However, if you want to grab Selpic S1/S1+ Ink cartridge of any color including Black, White, Yellow, Green, Red, and Blue, then you can own it for $83.99. You can know more about the sale by heading over to the official website.

UPDATE 14/07/2020

New Graphene Hall Effect Sensor to Improve Accuracy and Precision in Magnetic Measurement Applications

Posted on by mixos

The Cambridge-based startup, Paragraf has collaborated with the Magnetic Measurement section at CERN to demonstrate the potential of graphene-based Hall effect sensors to improve accuracy in magnetic measurement applications. Overcoming the shortfalls of existing Hall effect sensors that exhibit planar Hall effects that produce false signals, Hall effect Sensor from Paragraf truly senses magnetic fields along one direction giving a negligible planar Hall effect. This is because the active sensing component of the Hall effect Sensor from Paragraf is made of atomically thin graphene which is two-dimensional. This enables the true perpendicular magnetic field value to be obtained, allowing for higher precision mapping of the local magnetic field.

Opening the door to a new mapping technique by mounting a stack of sensors on a rotating shaft, Hall effect sensors without planar effect indeed will be the preferable option. Measurements of the harmonic content in accelerator magnets almost point-like along the magnet axis would be the added advantage. Wide temperature range from +80°C down to cryogenic temperatures of 1.5 Kelvin is one of the key properties of the Paragraf Hall effect sensor.

With this major step, CERN would be able to measure the fields inside the superconducting magnets with high accuracy. This could be done using sensors operating in liquid helium temperature ranges (below -269 °C, 4 Kelvin, -452 °F) where the calibration of sensors is less than trivial. CERN’s Magnetic Measurement section is planning to perform more in-depth tests on the Hall effect sensors to eventually use them in building a novel mapping system for magnetic fields. Currently, the Paragraf’s graphene Hall effect sensors are available to lead partners in small volumes.

OSRAM Opto Semiconductors SPL SxL90A LiDAR QFN Packaged SMT Lasers

Posted on by mixos

Osram SPL SxL90A LiDAR QFN Packaged SMT Lasers are infrared high-power SMT components for LiDAR (Light Detection and Ranging) applications. This allows autonomous vehicles to “see” farther and more effectively. The AEC-Q102 qualified four-channel and single-channel pulse lasers offer a performance of 125W at 40A per channel and an efficiency of up to 33%. The single-channel-version (SPL S1L90A_3 A01) offers low thermal resistance of 31K/W, whereas the four-channel device (SPL S4L90A_3 A01) offers just 17K/W. This makes it easy for heat to dissipate from the components even at high currents.

The four-channel version features a chip with four emission areas that deliver an outstanding optical power at 480W. The laser enables a much longer detection range at a size of just 3.35mm x 2.45mm x 0.65mm. This makes it only slightly larger than the single-channel-version of size 2.0mm x 2.3mm x 0.65mm. The two high-power SMT lasers also enable short pulse widths of around 2ns.

Features

  • 905nm laser wavelength
  • AEC-Q102 automotive qualified
  • High duty cycles and low Rth
  • 1- or 4-channel pulsed laser modules
  • Suited for short laser pulses from 1ns to 100ns
  • Up to 480W optical peak power (120W per channel)
  • SMT device

more information: www.osram.com

Introducing CrowPi2 STEM Learning Platform

Posted on by mixos

CrowPi2 combines Raspberry Pi and a range of common sensors, it’s just as useful for learning about STEAM education and setting up as a portable laptop. No matter you are one of fans of Raspberry Pi, a STEAM educator, or someone who wants to experience something interesting, CrowPi2 will be your best choice!

Specifications

  • Dimensions: 291(L)*190(W)*46(H)mm
  • Weight: 1.3kg
  • Screen: 11.6-inch 1920*1080 IPS screen
  • Camera: 2 megapixels camera with microphone
  • Power supply: DC12V/ USB 5V power supply
  • Power port: Micro USB/ DC
  • Keyboard: 2.4G wireless
  • Mouse: 2.4G wireless
  • Audio output: Stereo speaker
  • Volume adjustment: Support
  • Screen brightness adjustment: Support
  • Induction screen function: Support
  • Audio port: 3.5mm headphone jack
  • Compatibility: Compatible with Raspberry Pi 3B+, 3B, 4
  • Other function: storage box (power bank box)
  • Supporting operation system: Raspbian, Ubuntu, CentOS, Windows IOT, Kail, Pidora, ArchLinux, FreeBSD, Kodi, OpenWrt, RISC OS, RetroPie, LAKKA, Recalbox, LibreELEC, OSMC

 

Software

This is a software specially designed for Crowpi2 users, which integrates scratch, python programming and adaptation tutorials, Micro bit and Arduino compilation environment, and sometimes the most popular programming game Minecraft. In addition, it also takes into account the video and audio entertainment function, which not only allows you to play small python games, but also has a bu ilt in player to play audio and video files. Even if you want to learn about some of the hottest ai related projects of recent years face recognition and voice recognition we’ve provided you with examples to get you started.

Learning:

Integrated Scratch and python teaching resources, providing users with step-by-step tutorials to learn Scratch programming and python programming.

32 python courses

Among them, there are 32 python courses, mainly learning basic python grammar, module functions on the motherboard and some scenario application construction, as shown below:

 

Features:

  1. Convert between STEAM learning platform and portable laptop in second CrowPi2 comes with a removable wireless keyboard which can be removed easily from the body, this function allows you play and study in your own way, not matter use CrowPi2 as a laptop or learning platform.
  2. Custom-developed software integrates abundant education resources CrowPi2 provides 70+ lessons including Scratch, Python, AI and Minecraft for you to start step by step. In addition, another 30+ projects and python games for you to discover all the joys of Raspberry Pi. The offline account management allows you to save learning progress and achievements and conveniently continuing education.
  3. Featuring multiple common sensors to learn hardware and software better CrowPi2 Offers an all-in-one board with 22 necessary sensors, such as buzzer, RGB LED, relay and so on, which is very convenient for you learn hardware electronics while programming.
  4. Compatible with various open-source hardware and software CrowPi2 integrates various programming software such as Python, Scratch, Micro:bit, Arduino, and etc. You can use CrowPi2 as a control center to run rich open-source hardware, such as Arduino, Micro:bit, BeagleBone, and etc.
  5. Compatible with Raspberry Pi 4B ,3B+, 3B, get started via one-step installation Based on the latest version of Raspberry Pi (Raspberry Pi 4), CrowPi2 is also compatible with Raspberry Pi 3. On CrowPi2, you can finally see for yourself what all the fuss is about, immersing yourself in the endless possibilities of Raspberry Pi.
  6. Offline account management Teaching platform provides offline account management, which can independently save the learning progress and programming achievements of each learner for the convenience of further learning and sharing.
  7. Convenient to charge Support 5v/12v dual working voltage, accepted power supply by power adapter and portable power bank. The bottom of devices has a dual-purpose storage groove which can store small electronic parts, convenient for you to use small parts any time and save space.
  8. Explore many creative projects You also could explore many creative projects such as AI face recognition,AI voice recognition, Remote control Car,PIR Activated Video,Flying Cat ,Ultrasonic music

The CrowPi2 platform is live on Kickstarter and has 59 days to go.

AAEON Edge Solutions: Monitoring for Healthy Practices in Banking

Posted on by mixos

AAEON, a leading manufacturer of AI and IoT platforms, has worked with partners and developers to create solutions designed to address COVID-19 and other infectious diseases. While the current pandemic is winding down in some areas, many companies are rethinking what it means to do business in a world where it is key to be aware of how disease spreads. One key sector is in banking, where many kinds of customers may visit on a daily basis. In Southeast Asia, AAEON is partnering with developers to deploy the BOXER-8170AI and SCA-M01 IoT Node Board in body temperature and meeting room monitoring.

Fever detection and monitoring is an application that AAEON products such as the BOXER-8120AI, RT-620R and RT-660R are seeing great success powering in large facilities including hospitals and transit stations. However, the unique security requirements of banks generally mean there is only a single entrance that is monitored by posted security. Banks also usually don’t see crowds on the level of hospitals and metro stations, and when busy, banks are still easily managed by the security personnel present. The SCA-M01 IoT Node Board provides a perfect solution, offering low power consumption while still providing the computing power necessary for the task with an Arm Cortex M4 MCU+FPU. Connected directly to cameras, or even embedded in the cameras themselves, the SCA-M01 helps power fever detection and facial recognition at the edge to allow immediate notification for security staff. Support for Wi-Fi and LoRa, as well as compatibility with Arm Pelion IoT Platform, allow the SCA-M01 to be easily managed by a central control platform as well.

Another way AI edge computing is helping banks is in monitoring meeting rooms. AAEON’s customers have deployed BOXER-8170AI to power innovative AI software which not only helps with reducing the spread of disease, but also ensure a better experience for the bank’s own clients. The AI model can detect if a meeting room is occupied as well as ensure it is properly equipped. This can help reduce the spread of disease by monitoring and enforcing limits on the number of people in meeting rooms at one time, but also improve the banking experience by informing employees and managers of which rooms are occupied or missing furniture beforehand. The BOXER-8170AI offers to power of NVIDIA Jetson TX2 combined with four POE ports, each with their own dedicated chipset. This allows the BOXER-8170AI to not only connect to multiple cameras at once, but provides greater network bandwidth and eliminates any potential bottlenecking from the chipset. The BOXER-8170AI operates at the edge, and can also integrate with IoT management platforms including Arm Pelion.

“AAEON products are compatible with Arm Pelion IoT platform, allowing AI and IoT applications to be integrated and quickly deployed,” said Jeffery Chuang, Director of AAEON’s IoT Product Division. “AAEON and Arm have collaborated on several IoT applications, with the Arm Pelion user interface providing a clear, easy to use platform, combined with the reliable and powerful embedded hardware from AAEON. Together AAEON and Arm Pelion power the level of encryption and security required by banks for a seamless solution,” Jeffery added.

AAEON offers a range of IoT and AI Edge Computing platforms designed for embedded applications that can be monitored and controlled remotely. For more information, visit www.AAEON.com to view products and get in contact with sales representatives.

Axiomtek’s Ultra-Compact Edge AI System Powered by NVIDIA® Jetson Nano™ – AIE100-903-FL

Posted on by mixos

Axiomtek – a world-renowned leader relentlessly devoted in the research, development and manufacture of series of innovative and reliable industrial computer products of high efficiency – is pleased to release the AIE100-903-FL, an ultra-compact edge AI system. The high-performance AIE100-903-FL is powered by the NVIDIA® Jetson Nano™ module, which has a powerful quad-core ARM® Cortex®-A57 MPCore processor and NVIDIA Maxwell™ GPU architecture with 128 NVIDIA CUDA cores. In order to easily install and deploy an IP camera, this user-friendly AI-enabled system is equipped with a 15W GbE PoE port for both power and video transmission. The advanced AIE100-903-FL was designed for intelligent edge AI applications, such as AI computing, edge computing, smart retail, smart city, and more.

“The AIE100-903-FL offers support for NVIDIA® JetPack 4.3.1 for ease of development for AI computing and deep learning applications such as people counting, behavior analysis and facial recognition. With its strong construction, this ultra-compact edge AI platform can operate under a wide range of temperatures from- 30°C to +60°C and withstand vibration up to 3 Grms. Moreover, it offers an optional waterproof IP42-rated cover kit to strengthen the protection of semi-outdoor environments. This AI-powered system is well-suited for use in moist places, for instance, besides the freezer, under the eave or at the arcade,” said Annie Fu, a product manager of Product PM Division at Axiomtek.

Axiomtek’s AIE100-903-FL has rich I/O interfaces, including one USB 3.0 port, one USB 2.0 port, one Micro USB port, one GbE LAN, one GbE PoE and one HDMI 2.0 with 4K2K supported. It also has one recovery switch, one reset button, one power button, one 12 VDC power input and two SMA-type antenna openings. Users can use the recovery switch and Micro USB to flash the image without opening the chassis. The AIE100-903-FL has a 16GB eMMC onboard via the Jetson Nano. It is also equipped with one M.2 Key M 2280 slot and one Micro SD slot for massive data processing. Besides, this reliable embedded system has one full-size PCI Express Mini Card slot and one SIM slot for 3G/4G, GPS, Wi-Fi and Bluetooth connections.

Advanced Features:

  • NVIDIA® Jetson Nano™ with Maxwell™ GPU architecture with 128 NVIDIA CUDA® cores
  • High AI computing performance for GPU-accelerated processing
  • Ideal for edge AI smart city applications
  • Optional IP42 cover kit for semi-outdoor applications
  • Supports one 15W GbE PoE for camera
  • Wide operating temperature from -30°C to +60°C
  • JetPack supported

The AI-powered AIE100-903-FL is now available for purchase. For more product information or customization services, please visit our global website at www.axiomtek.com or contact one of our sales representatives at info@axiomtek.com.tw.

InnoPhase Releases INP1010, INP1011 Talaria TWO Modules

Posted on by mixos

InnoPhase released the INP1010 and INP1011 Talaria TWO™ modules. The solutions host wireless connectivity and an integrated microcontroller for edge of network IoT designs.

According to the company, the Talria TWO is the world’s lowest power Wi-Fi solution because of its digital polar radio architecture.

The recipience of the CES 2020 Innovation Award, Talaria TWO is incorporated with the INP1010 and INP1011 modules.

Some features per a company press release include Wi-Fi and BLE for wireless data, an embedded Arm Cortex-M3 for system control and user applications, and advanced security elements for device safeguards. Furthermore, they can operate in stand-alone mode in combination with the external MCU, or in a hybrid mode. This allows for system control and processing to be shared between the module and the MCU.

The modules also come equipped with clocks, passives, and antennas, in addition to being certified with the Wi-Fi Alliance, Bluetooth SIG, FCC, IC (Canada) and awaiting CE approval.

For more information, visit innophaseinc.com/talaria-two-modules

Nexperia Releases New GaN FET Devices

Posted on by mixos

Nexperia released a new set of GaN FET devices (650 V GAN041-650WSB in TO-247 and GAN039-650NBB in CCPAK) that feature the company’s high-voltage GaN HEMT H2 technology in both TO-247 and the company’s proprietary CCPAK surface mount packaging. The cascode within the devices allows for higher levels of switching FOMs and on-state performance.

Features of the new GaN FET devices, per a press release, include the following:

The new GaN technology employs through-epi vias, reducing defects and shrinking die size by around 24%. RDS(on) is also reduced to just 41 mΩ (max., 35 mΩ typ. at 25 °C) with the initial release in traditional TO-247, with high threshold voltage and low diode forward voltage. The reduction will further increase, to 39 mΩ (max., 33 mΩ typ. At 25 °C) with CCPAK surface-mount versions. Because the parts are configured as cascode devices, they are also simple to drive using standard Si MOSFET drivers. Both versions meet the demands of AEC-Q101 for automotive applications.

Nexperia’s CCPAK surface-mount packaging leverages the company’s copper-clip package technology, which replaces internal bond wires. The technology allows for reduction in parasitic losses, optimizes electrical and thermal performance, and improves reliability, according to the company.

For more information, visit www.nexperia.com/gan-fets

Elektor Archive 1974-2019 in a USB stick for only 99.95€

Posted on by mixos

This handy USB stick (32 GB, USB 3.0) is loaded with all the Elektor magazine English editions (as PDFs) from 1974 to 2019. Elektor engineers, authors, and editors aim to inspire you to master electronics and computer technology by presenting professionally designed circuits that are easy to build. We also cover the latest developments in electronics and information technology. With the Elektor Archive on a USB stick, you can browse our previous English editions at your convenience and learn about MCU-based projects, robotics, electronics testing, embedded programming, analog techniques, and much more.

All the Elektor magazine editions are stored as PDFs on a 32-GB USB stick (USB 3.0). The 10,000+ articles have been classified by date of publication (month/year), and a comprehensive index enables you to search the entire USB stick. Subject areas include:

  • Audio & video
  • Computers & microcontrollers
  • Radio, hobby & modelling
  • Home & garden
  • Power supplies & batteries
  • Test & measurement
  • Software
  • And everything else that doesn’t fit in one of these categories.

If you are interested in designing, sharing, and selling electronics, you must have Elektor’s entire English archive!

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