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29 Jun 2014

Internal-32MHz-RC-oscillator-without-PLL-1

by Shawon Shahryiar @ embedded-lab.com:

Okay firstly the reason I wrote about the clock system instead of I/O ports or something else in this second post of the XMega series is simply because of the fact that without understanding clock configurations you won’t get what you want from your chip. Since XMega’s clock system is software-level configurable and complex at first, it makes itself the first priority module before anything else.

XMega Clock System - [Link]

29 Jun 2014

electrochromic-1

Colin Jeffrey @ gizmag.com writes:

In a conventional camera lens, the iris consists of a set of overlapping mechanical blades that control the amount of light entering the camera. As efficient as this mechanical system is, it is too bulky and too difficult to miniaturize to be incorporated in smartphones and other compact devices. To address this, a team of researchers has used “smart glass” to create a micro-sized electronic iris that may bring much greater image quality and flexibility to smartphone cameras.

“Smart glass” iris could bring greater quality and flexibility to smartphone cameras - [Link]

29 Jun 2014

Oscillo2-500x349

by prem_ranjan @ open-electronics.org:

We have designed an Oscilloscope using PC and Arduino Board. The signal is first of all fed to the Arduino Board where the analog signal is converted to a digital signal by the ADC which is then serially outputted to the PC and is read by the MATLAB software via the COM ports. Here the signal is read in the form of digital data but then is converted to analog one by using the resolution of the ADC used by the Arduino Board. The MATLAB software was then used to plot the signals.

A PC and an Arduino: here’s your DIY Oscilloscope - [Link]

29 Jun 2014

Dave teardown 3 classic analog multimeters:

EEVblog #634 – Analog Multimeter Teardowns - [Link]


29 Jun 2014

audio_leveling

w2aew @ youtube.com writes:

This video presents a simple automatic audio volume leveling circuit. The application that prompted this is a police/fire/emergency scanner. Often times, different services will have different volumes in the receiver – so adjusting for a comfortable listening level on one service/station will often lead to other services being too loud or too quiet. This circuit will automatically adjust the volume of each received signal based on the signal’s peak amplitude. Similar circuits have been widely published, so there’s really nothing new here – just a quick tutorial and demonstration of how this circuit works. An arrangement of capacitors and diodes are used to implement a peak detector to measure the input signal amplitude. The dynamic impedance of diodes is controlled/changed to adjust the signal level. The result is a leveling circuit that has a very wide input dynamic range with a near constant average output level.

Circuit fun: Automatic audio leveling circuit - [Link]

29 Jun 2014

F1

by Ryan Roderick, Intersil @ edn.com:

The fundamentals to translating the analog world into the digital domain reduces to a handful of basic parameters. Voltage, current, and frequency are electrical parameters that describe most of the analog world. Current measurements are used to monitor many different parameters, with one of them being power to a load.

There are many choices of sensing elements to measure current to a load. The choices of current sensing elements can be sorted by applications as well as the magnitude of the current measured. This write up is part one of a three part series that discusses different types of current sensing elements. The focus of this paper is evaluating current measurements using a shunt (sense) resistor. The paper explains how to choose a sense resistor, discuss the inaccuracies associated with the sensing element and the paper discusses extraneous parameters that compromises the overall measurement.

Sensing Elements for Current Measurements - [Link]

28 Jun 2014

obr1549_1

With components from Belden, Hirschmann, Lumberg automation and other brands of company Belden group you´ll solve any challenge in industrial automation.

If you work with sensors, signals and a data transfer in industry in general, then you´re probably familiar with brands like Belden, Hirschmann and Lumberg automation. It´s a less known fact, that all these brands (and other) belong to company Belden group.

We mention all this mainly because some components from Belden group could be found in our portfolio already for some time. As an authorized distributor of Belden we enlarged our cooperation even more and enhanced our offer with another products.

In the Belden group portfolio can be found solutions for:

● industrial networking
● industrial connectivity
● cables and cable assemblies
● machine control (MCS – machine control solutions)
● broadcasting and AV, and many other …

From the point of view of producers of various industrial devices are very interesting industrial connectors, i.e. mechanically very stable and reliable connectors with IP rating for transmission of signals from sensors and also in an opposite way – for controlling (driving) of various actuators. It can be said, that they´re „internationally standardized” and widely used , whether in round versions – so called „sensor connectors“(IEC 61076-2-xxx) of various sizes (M8, M12, M20, …) or rectangular – „valve connectors “ according to DIN EN 175 301-803.

Universal connectors usable for power supply, control and data transmission are another very interesting group of components. Here belong for example CA series connectors.

In many cases it´s more convenient and simpler to use ready-made cables with a connector, often hermetically sealed, providing the highest protection against harsh environment and pollution. Cables are available with a PVC or PUR insulation, and also a welding sparks resistant PUR. Cables are available with one connector (the other end is free, suitable for soldering in or insertion into a connector) and also with connectors on both sided (the same or different types). Also available are cables with an approval for usage in a food industry.

For all cases, when several connectors should be interconnected on one place, are suitable so called distribution boxes (I/O modules) with a various count of connectors (ports).

Another interesting group are components for „Industrial Ethernet“. Here can be found for example Ethernet switch, RJ45/M12 adapters and various interconnecting cables.

In respect to a huge amount of versions and series, we recommend you to have a look at the „Belden Industrial Connecting solutions” catalogue, where you can find particular products comprehensively sorted by given groups. Solutions for other segments can be found on http://www.beldensolutions.com website.

Belden group are more than just cables - [Link]

28 Jun 2014

microchip

by elektor.com:

Anticipating the need for secure communications for the next level of device connectivity Microchip have integrated a complete hardware crypto engine into their PIC24F family of microcontrollers. Computers normally use software routines to carry out data encryption number crunching but for low power microcontrollers this method will generally use up too much of the processor’s resources and be too slow.

Microchip have integrated several security features into the PIC24F family of microcontrollers (identified by their ‘GB2’ suffix) to protect embedded data. The fully featured hardware crypto engine supports the AES, DES and 3DES standards to reduce software overheads, lower power consumption and enable faster throughput. A Random Number Generator is also implemented which can be used to create random keys for data encryption, decryption and authentication to provide a high level of security. For additional protection the One-Time-Programmable (OTP) key storage prevents the encryption key from being read or overwritten.

Microchip PICs with Integrated Crypto Engine - [Link]

28 Jun 2014

2014-06-13-16.44.09-1024x768

by Juan Chong @ juanjchong.com:

In this post I’ll be going over how to cut out solder stencils for both ExpressPCB and EagleCAD designs on a laser cutter. I recently had a need to create some stencils from both of these programs and spent quite a bit of time at the Dallas Makerspace working with their laser cutter to get the settings just right. I’ll be cutting some designs that are mostly 0603/0805 package sizes, so don’t expect ultra-tight pitch stencils from this technique!

Cutting Mylar Solder Stencils from ExpressPCB and EagleCAD Files - [Link]

28 Jun 2014

alt_slvscc4

TPS54361-Q1 4.5-V to 60-V Input, 3.5-A, Step Down DC-DC Converter with Soft-Start and Eco-mode™. by ti.com:

The TPS54361-Q1 device is a 60-V, 3.5-A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 65 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode and supply current of 152-µA enables high efficiency at light loads. Shutdown supply current is reduced to 2 μA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can increase using an external resistor divider at the enable pin. The output voltage startup ramp is controlled by the soft start pin that can also be configured for sequencing/tracking. An open-drain power-good signal indicates the output is within 93% to 106% of the nominal voltage.

TPS54361-Q1 – 4.5-V to 60-V Input, 3.5-A, Step Down DC-DC Converter with Soft-Start - [Link]



 
 
 

 

 

 

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