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12 Jan 2015


All about Op Amp stability app note from Linear Technology.

Well, it shouldn’t. We analog designers take great pains to make our amplifiers stable when we design them, but there are many situations that cause them to oscillate in the real world. Various types of loads can make them sing. Improperly designed feedback networks can cause instability. Insufficient supply bypassing can offend. Finally, inputs and outputs can oscillate by themselves as one-port systems. This article will address common causes of oscillation and their remedies.

App note: Does your op amp oscillate? - [Link]

12 Jan 2015


Beauty in simplicity – adjustable bimetal thermostat operates independently from a power supply.

Thermal comfort is, when a temperature in a house is 21-24 °C and a relative humidity is …. No, sorry, your device can withstand much more. At least 0 to 60°C or much more. If you have a device, where you need to guide the temperature, then DIN-rail thermostats are the simplest usable solution. Series 7T from company Finder offers a possibility to use such thermostats to control heating, cooling (fans) or their combination…

Besides purely industrial applications, these thermostats can also be used to control temperature in buildings or garages – for example as a frost protection. In our stock can be found five types, mainly with a range of 0 to +60°C. Available are 2 basic series – 7T81 and 7T91. 7T81 is a narrower, only 17.5 mm wide series. Series 7T91 is wider, with a more perforated enclosure, i.e. there´s an assumption of somewhat quicker reaction to temperature changes.

Orientation among types is simple. Types with a suffix …23xx are intended for switching of cooling (blue adjustable knob), i.e. after reaching a set temperature a bimetal contact switches on. Here belong for example types 7T. and 7T.

Types with a suffix …24xx are intended for switching of heating (red adjustable knob), i.e. after reaching a set temperature, a contact switches off. Here belong for example types 7T. and 7T. However in the 7T series can also be found types usable in both ways, for example 7T. (range +5 to +60°C).

Detailed information will provide you datasheets Finder 7T81 (EN) and Finder 7T91 (DE).

Thermostats Finder ensure a thermal comfort to your devices - [Link]

10 Jan 2015


by Mike Senese @ makezine.com:

Typically when electrical engineers wants to make a new circuitboard, they need to send their design files to a manufacturer and wait for it to be produced and mailed back. Hardware startup Voltera aims to expedite this process by putting it in on your desk with its V-One consumer circuit board printer.

Print Your Own Circuit Boards and Reflow SMD Components with the Voltera V-One - [Link]

10 Jan 2015


by Husham Samir @ instructables.com:

A temperature data logger, is a portable measurement device that is able to recording temperature over a defined period of time automatically. The data can be retrieved and viewed after it has been recorded. In this device the temperature will record every one minutes in CSV file.

Temperature Data Logger - [Link]

10 Jan 2015

The new Keysight/Agilent 3000T Oscilloscope is released today, and Dave has a world first review of it.
It’s a replacement for the existing 3000A X-Series, and is essentially the same in many ways, so only the differences are
covered in this video.

A lot of features from the 4000 X-Series have filtered down, and some things are now standard.
How does it compare to the Tektronix MDO3000?

EEVblog #701 – Keysight 3000T Oscilloscope Review - [Link]

10 Jan 2015

TheSignalPathBlog @ youtube.com:

In this episode Shahriar attempts a repair of an Agilent E3642A DC Power Supply which is completely non-responsive. After presenting a teardown of the power supply, the GPIB interface is used to verify the functionality of the power supply. The problem is traced to the main display unit which communicated with the main power supply via a serial interface.

After disassembly of the display, it is revealed that the entire unit has suffered a catastrophic failure due to the VFD display drive IC. All components must be individually removed and replaced. Unfortunately the main processor is a Mask ROM IC version (80C51) and cannot be sourced. Can you help Shahriar find a replacement part?

Teardown, Repair and Analysis of an Agilent E3642A DC Power Supply - [Link]

9 Jan 2015


by elektor.com:

AtmelCorporation have announced two additions to their SAM G series of ARMCortex-M4-based MCUs. The two latest models are designated the SAM G54 and SAM G55. They feature high performance (up to 120MHz), low-power (102 µA/MHz in active mode, down to 5 µs wake-up) and tiny outline (as small as 2.84 x 2.84mm). Both are targeted at IoT applications and include all the features of the current SAM G family of devices including an Atmel | SMART ARM Cortex-M4 MCU + FPU (floating point unit) together with integrated sensor fusion algorithms.

Two new MCUs from Atmel - [Link]

9 Jan 2015


by othermachine @ instructables.com:

Hello! Welcome to another Other Machine project tutorial! I’m Sam DeRose, a former Other Machine Co. Summer Intern. I created The Nerd Watch last summer while working at OMC.

The Nerd Watch displays the time in binary when the button is pushed. The watch shows the hour and minutes by flashing two LEDs in sequence to represent two 4-bit binary numbers (in big-endian format). Here’s a great description of how to read binary numbers.

In this Instructable, I’ll show you how to build a Nerd Watch from scratch with a few electronics components, and an OMC Othermill.

This Instructable presumes you have previous experience working with surface mount electronic components, and that you are no stranger to a multimeter or soldering.

The Nerd Watch - [Link]

9 Jan 2015


by Dmitry Griberg @ dmitry.gr:

You’ve probably seen various holiday or birthday cards that play a little jingle via beeps when they are opened. Last few years have brought new ones that play actual sampled music for a dozen seconds or so. I decided, for this new year’s celebration, to make a card that, when opened, will play a complete song in full fidelity. And the song it should play should be selected randomly each time of many. The project would be housed in a normal CD jewel case. The project was further complicated by the fact that it is impossible to predict shipping times during the holidays. Thus the task was to do all this, using nothing but whatever materials and components that I already had at home. I managed to do this successfully, and the project worked well. It is not the best designed or the most efficient, but it does work.

Musical holiday card using microSD card - [Link]

9 Jan 2015


by elektor.com:

The LTM4625 from Linear Technology is a switching mode μModule (micromodule) regulator in a tiny 6.25 mm × 6.25 mm × 5.01 mm BGA package. Like many of the newer regulator designs, the package includes the switching controller; power FETs, inductor and support components. Operating over an input voltage range of 4 V to 20 V (or 2.375 V to 20 V with an external bias supply) the LTM4625 supports an output voltage range of 0.6 V to 5.5 V, set by a single external resistor. Its high efficiency design delivers up to 5A continuous output current. Only bulk input and output capacitors are needed.

Complete 5A step-down Regulator - [Link]





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