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20 Jan 2015

arm_pro_mini

ARM PRO MINI is a small barebone open source ARM M0 microcontroller board that is great for quick prototyping and as a starting point for your own ARM based custom designs. It was designed and named after the venerable Arduino Pro Mini and it is an excellent stepping stone for makers and hobbyists ‘graduating’ from Arduino to the ARM architecture.

ARM PRO MINI - [Link]

20 Jan 2015

USB-Se0Pulse-600x360

Ralph Doncaster writes:

Since the release of V-USB, dozens of projects have been made that allow an AVR to communicate over USB. USB data signals are supposed to be in the range of 2.8 to 3.6V, so there are two recommended ways to have an AVR output the correct voltage. One is to supply the AVR with 3.3V power, and the other is to use 5V power but clip the USB data signal using zener diodes. Most implementations of V-USB, like USBasp, use the zener diodes. I’ll explain why using a 3.3V supply should be the preferred method.

USB interfacing for AVR microcontrollers - [Link]

20 Jan 2015

Dave reviews the new Rigol DS1054Z Oscilloscope. Is this US$399 marvel really the best value budget oscilloscope on the market?

EEVblog #703 – Rigol DS1054Z Oscilloscope Review Summary - [Link]

20 Jan 2015

3795

LT3795 – 110V LED Controller with Spread Spectrum Frequency Modulation. by elektor.com:

It’s standard practice to use Pulse Width Modulated (PWM) signals to control electrical energy delivered to a load. Special precautions are however necessary to mitigate the effects of electromagnetic interference (EMI) generated when high-energy loads are regulated in this way. Spectral analyses of the interference generated show strong peaks at the fundamental and harmonics of the PWM frequency. For high-power switch-mode drivers used to control LED car headlights it is important to ensure the interference cannot disrupt radio or GPS reception. EMI filters and gate resistors can be used to slow down switching edges but have the effect of increasing energy losses.

Spread Spectrum LED driver - [Link]


20 Jan 2015

f352c31ae29d6a9a27f1b3a5d4d47f85_largeA totally new energy supply technology for mobile electronic devices. Efficient and remains independent from the power grid.

kraftwerk opens up a whole new dimension in freedom and independence when it comes to supplying your mobile electronic devices with energy. Why? Because kraftwerk enables you to generate your own energy using a small, handy device – in such large amounts that you can run your iPhone, tablet, or even your GoPro camera for weeks!

The Kraftwerk Fuel Cell - [Link]

19 Jan 2015

VEMD5x10X01

Vishay Intertechnology is broadening its optoelectronics portfolio with the introduction of two new automotive-grade high-speed silicon PIN photodiodes in top-view, surface-mount packages measuring 5 mm by 4 mm by 0.9 mm. Offering a large sensitive area of 7.5 mm2, the Vishay Semiconductors VEMD5010X01 and VEMD5110X01 provide high radiant sensitivity with a reverse light current of 48 µA and a very low dark current of 2 nA for automotive, industrial, and medical applications.

The AEC-Q101-qualified devices are manufactured using Vishay’s new foil assisted mold (FAM) technology. The photodiodes’ leadframe, bond wire, and connection pads are molded in a black epoxy, while a free cavity above the radiant sensitive area allows light to enter the package for signal generation. This design enables a smaller overall package size with a lower height profile, while maintaining a large radiant sensitive area. In addition, thermal stress on the bond is reduced for increased robustness and reliability.

Vishay Intertechnology Automotive-Grade PIN Photodiodes Deliver 7.5 mm² Sensitive Area in Low-Profile Packages - [Link]

19 Jan 2015

ncomms7010-f2

Scientists have created a new generation of biosensors that could potentially allow machines to sniff out subtle differences in smell with more accuracy than our own human noses. From University of Manchester:

Every odour has its own specific pattern which our noses are able to identify. Using a combination of proteins coupled to transistors, for the first time machines are able to differentiate smells that are mirror images of each other, so called chiral molecules, something that has not been possible before. The human nose can distinguish between some of these molecules and the different forms of the same molecule of carvone, for example, can smell either like spearmint or caraway. Previous machines would not have been able to distinguish between the two.

The development will allow the creation of a new generation of biosensors with an acute ability to sniff out problems. These could have many industrial uses such as telling when food has gone off, and they could even be accurate enough to smell how much pollution is in the atmosphere.

A collaboration of academics from The University of Manchester and the University of Bari in Italy, have created a biosensor that utilises an odorant binding protein. The team’s findings are published today in the journal Nature Communications.

[via]

New Sensors Could Allow Machines to Smell More Accurately Than Humans - [Link]

19 Jan 2015

1412644_orig

by Joe @ hobbyelectronics.net:

This project was built to monitor the temperature of one of our computer rooms at work that has rather temperamental air-conditioning. The maximum temperature can be set, and if this is exceeded an alarm is activated.The unit gives a continuous display of current temperature and it’s possible for the constructor to change the device program firmware or display board.

LED display Over Temperature Alarm - [Link]

19 Jan 2015

app2-600x244

Li-Ion/Polymer Shunt battery charger system with low battery disconnect (PDF!) app note from Linear Technology:

The LTC®4071 allows simple charging of Li-Ion/Polymer batteries from very low current, intermittent or continuous charging sources. A near zero current low battery latching disconnect function protects even the lowest capacity batteries from deep discharge and potentially irreparable damage. The 550nA to 50mA operating current makes charging possible from previously unusable sources. With its low operating current the LTC4071 is well suited to charge low capacity Li Ion or thin film batteries in energy harvesting applications. The unique architecture of the LTC4071 allows for an extremely simple battery charger solution, requiring just one external resistor.

Li-Ion/Polymer Shunt battery charger system with low battery disconnect - [Link]

18 Jan 2015

obr1566_1

Perhaps the most frequently used rechargeable batteries on the market nowadays – Lithium-Polymer (Li-Po) can be found also in our offer.

From the beginning of electronics, the world searches for an “ideal” rechargeable battery. So far such a battery doesn´t exist (maybe supercapacitors in the future), but Li-Po (Li-Pol) cells are quite near to an ideal in some aspects.

Very low self-discharge (approx. 5% / month), high voltage of a cell (3,7-3,8V average), high energy density and a low weight, considerably stable discharge voltage and a possibility to recharge anytime are one of the main advantages of Li-Po cells. Another benefits are advantageous flat shape, high variability in dimensions and a long lifetime. No wonder, that Li-Po cells have become no. 1 in consumer electronics, hand tools and in many industrial devices.

Perhaps the only drawback of these cells is their lower chemical stability at overcharging (in a corner case ending up with a fire). But that´s the case which is practically eliminated at a common operation with a suitable charging circuit (chip or a charger intended for Li-Po).

Basic principle at usage is not to exceed approx. 4.25V charging voltage and the battery is almost discharged at a voltage below approx. 3.0V (2.75V). On the very end of a discharge cycle, the inner resistance slightly increases, what can cause a slight heating of a battery at higher currents – it is a normal behavior. Charging is usually based on a method constant voltage/ limited current. In principle it´s possible to use the same chargers and charging circuits for Li-Ion as well as Li-Po cells.

At a usual usage and discharging to say 20-80%, Li-Po cells will reward you by a reliable operation and a long lifetime. Flat shape is ideal for various handheld equipment, as well for usage in flat enclosures. In respect to a low self-discharge it´s possible to use Li-Po cells even as a backup energy source.

In our offer can be found several several Li-Po types from company EEMB with a capacity of 130 mAh to 2000 mAh. Exact list of available types and datasheets can be found below this article. Upon request, we´re able to provide you also many other types.


Try the most favorite type of batteries - [Link]



 
 
 

 

 

 

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