Raspberry Pi OLED Internet Bandwidth Display


by Archie500 @ instructables.com:

In a very brief summary it works as follows: The Raspberry Pi uses SNMP (Simple Network Management Protocol) to get the WAN data rates from the router and then displays these graphically on the OLED screen.

The Raspberry Pi was already set up as our media player and is next to the television. The OLED display was inexpensive and can be bought from a number of places including eBay.

Raspberry Pi OLED Internet Bandwidth Display – [Link]

Energy Harvesting Circuit


by hackarobot.com:

Recently, I built an energy harvesting circuit based on an ultra low voltage DC/DC step up converter chip (LTC3108) from Linear Technology. With a 1:100 coil transformer (CoilCraft LPR6235), it converts the tiny voltage generated from Peltier thermo-electric generator into high enough level to drive small circuits.

Energy Harvesting Circuit – [Link]

Extech GX900 vs Fluke 287 Graphical Multimeter Review

This is a review of the Extech GX900 vs Fluke 287 Multimeter
Extech Is owned by FLIR. Thanks to FLIR for providing the GX900 for this review.

Extech GX900 vs Fluke 287 Graphical Multimeter Review – [Link]

Siglent SDM3055A (SDM3055) 5.5-Digit Multimeter Review, Teardown & Experiments

In this episode Shahriar reviews the Siglent SDM3055A (SDM3055) 5.5-Digit Multimeter. After a brief look at the instrument’s datasheet, a full teardown is presented. The instrument utilizes a two-board design and a large LCD screen. The SDM3055A provides a comprehensive set of measurements including capacitance as well as various graphing capabilities including histogram, trend and bar graphs. USB and LAN connections are standard and a USB-GPIB can also be purchased. The performance of the instrument is verified through experiments with various functions and setups.

Siglent SDM3055A (SDM3055) 5.5-Digit Multimeter Review, Teardown & Experiments – [Link]

Scullcom Hobby Electronics #26 – Build a Function Generator Part 2

by Scullcom Hobby Electronics @ youtube.com

This is part 2 of the building a function generator. We cover the output stage and discuss some changes to the original design. Finally, we build the project in to a case and test.
Below are the links to the latest main schematic diagram and a second file for the Display and Arduino schematic.

Scullcom Hobby Electronics #26 – Build a Function Generator Part 2 – [Link]


Infineon’s Security Chip


by Martin Cooke @ elektormagazine.com:

Protection of Intellectual Property is a major issue as industrial systems become increasingly more interconnected. According to Bartol Filipovic, head of the Product Protection and Industrial Security department at the Fraunhofer Institute for Research “Most companies have no idea just how easy it is to copy their products, encrypted software is not enough to protect standard products or machine code. The software must be ideally stored inside protected hardware.”

Infineon has developed a broad range of semiconductor technologies to counter these growing security threats. The OPTIGA Trust E SLS32AIA hardware security device provides a cost effective solution for high value goods. It forms part of the OPTIGA™ Trust family high-security solution for industrial automation systems, smart homes, consumer and medical devices. The OPTIGA™ Trust E provides enhanced protection of services, business models and user experience. Based on its 1-way authentication mechanism, it uniquely identifies objects and provides protection of Public Key Infrastructure (PKI) networks.

Infineon’s Security Chip – [Link]

Circuit adds foldback-current protection

Use-an-LM317-as-0-to-3V-adjustable-regulator-fig-1 by Rafael Garcia-Gil @ edn.com:

For many applications that require power-supply currents of a few amperes or less, three-terminal adjustable-output linear voltage regulators, such as National Semiconductor’s LM317, offer ease of use, low cost, and full on-chip overload protection. The addition of a few components can provide a three-terminal regulator with high-speed short-circuit current limiting for improved reliability. The current limiter protects the regulator from damage by holding the maximum output current at a constant level, IMAX, that doesn’t damage the regulator (Reference 1).

Circuit adds foldback-current protection – [Link]

Use an LM317 as 0 to 3V adjustable regulator


by Vladimir Rentyuk @ edn.com:

Most engineers know that they can use an inexpensive, three-terminal adjustable regulator, such as Fairchild Semiconductor’s LM317, as an adjustable regulator to only some necessary value of voltage, such as 36 or 3V. This value cannot be less than 1.25V without employing other approaches, however. The devices’ inner reference voltage is 1.25V, and their output voltage accordingly cannot be less than this value without potential bias (Reference 1). One way to solve this problem is to use a reference-voltage source based on two diodes (Reference 2).

Use an LM317 as 0 to 3V adjustable regulator – [Link]

Making the new silicon: Gallium nitride electronics could drastically cut energy usage


by Rob Matheson @ phys.org:

An exotic material called gallium nitride (GaN) is poised to become the next semiconductor for power electronics, enabling much higher efficiency than silicon.

In 2013, the Department of Energy (DOE) dedicated approximately half of a $140 million research institute for power electronics to GaN research, citing its potential to reduce worldwide energy consumption. Now MIT spinout Cambridge Electronics Inc. (CEI) has announced a line of GaN transistors and power electronic circuits that promise to cut energy usage in data centers, electric cars, and consumer devices by 10 to 20 percent worldwide by 2025.

Power electronics is a ubiquitous technology used to convert electricity to higher or lower voltages and different currents—such as in a laptop’s power adapter, or in electric substations that convert voltages and distribute electricity to consumers. Many of these power-electronics systems rely on silicon transistors that switch on and off to regulate voltage but, due to speed and resistance constraints, waste energy as heat.

Making the new silicon: Gallium nitride electronics could drastically cut energy usage – [Link]

WIFI Mains Power Dimmer / Switch


MAINS Power Dimmer / Switch Module project by Tracker J:

Now it’s about time to talk also about what many of you has asked for: DIMMING!
It’s a total different story, little bit complicated but, as you will see, not so hard to understand.

General considerations:
There are several types of dimmers generally available. These are used for resistive, and inductive loads, such as incandescent,cold cathode and low voltage (inductive) lamp sources. Note that not all electronic transformers used for low voltage lamps are suitable for dimming by Triac or Thyristors dimmers. In case of Thyristors you need 2 of them as Thyristor is a Unidirectional device and because AC power flows in both directions!

WIFI Mains Power Dimmer / Switch – [Link]