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4 Mar 2015

article-2015february-specialized-ics-pv-cells-fig4

by Stephen Evanczuk @ digikey.com:

Indoor lighting offers a convenient energy source for many applications but lacks the high-power levels of solar energy. In fact, indoor lighting energy-harvesting systems face a number of challenges that differ subtlety from those encountered in solar-energy harvesting. Nevertheless, engineers can quickly implement energy-harvesting designs using a variety of components and specialized devices from manufacturers including Cymbet, IXYS, Linear Technology, Panasonic, STMicroelectronics, and Texas Instruments, among others.

Specialized ICs, PV Cells Enable Energy Harvesting from Indoor Lighting - [Link]

4 Mar 2015

dendrite-free-battery-0

by Colin Jeffrey @ gizmag.com:

Dendrites – thin conductive filaments that form inside lithium batteries – reduce the life of these cells and are often responsible for them catching fire. Scientists working at the Pacific Northwest National Laboratory (PNNL) of the US Department of Energy claim to have produced a new electrolyte for lithium batteries that not only completely eliminates dendrites, but also promises to increase battery efficiency and vastly improve current carrying capacity.

New electrolyte promises to rid lithium batteries of short-circuiting dendrites - [Link]

4 Mar 2015

DN523f1

by DAVID BURGOON @ edn.com:

There are several ways to produce a negative voltage from a positive voltage source, including using a transformer or two inductors and/or multiple switches. However, none are as easy as using the LTC3863, which is elegant in its simplicity, has superior efficiency at light loads and reduces parts count compared to alternative solutions.

The LTC3863 can produce a –0.4V to –150V negative output voltage from a positive input range of 3.5V to 60V. It uses a single-inductor topology with one active P-channel MOSFET switch and one diode. The high level of integration yields a simple, low parts-count solution.

AppNote: Inverting DC/DC controller converts a positive input to a negative output with a single inductor - [Link]

4 Mar 2015

3d_001-600x460

Peter of Cytec BG writes:

My idea was for pcb designers to be able to quickly, without too much hassle, check their board for correct footprints (especially for connectors) and collisions between components. Currently one can change soldermask colors, silkscreen layers, move and rotate components around, change component models and import step files.

[via]

3D Eagle BRD Viewer - [Link]

 


4 Mar 2015

20W_BRIDGE_AUDIO_AMP

20W Bridge Audio Amplifier project, based on the TDA2005 IC, The TDA 2005 IC is class B dual audio amplifier, specifically designed for car radio applications etc.

Specifications:

Power supply input : 18 VDC
Output power : 20 W, 4 Ω
IC built in Thermal Shut-down, Load dump voltage surge protected
Terminal pins for connecting left and right audio signal inputs
Berg Connector for connecting Potentiometer (POT) for volume adjustment
Power Battery Terminal (PBT) for easy power supply and speaker connection
Power-On LED indicator
Heatsink for IC
Four mounting holes of 3.2 mm each with nut and stud
PCB dimensions 63 mm x 65 mm
Note : Use shielded cable for connecting potentiometer

20W Bridge Audio Amplifier - [Link]

4 Mar 2015

DI5486f1

by Dan Meeks @ edn.com:

This Design Idea is a solid state relay (SSR) which uses a triac to switch AC loads at high current. There are plenty of simple SSR circuits available, but this may be the simplest circuit that achieves turn-on and turn-off only when the AC line voltage is near zero.

Simple SSR has zero-cross on/off switching - [Link]

3 Mar 2015

 

LT3042

The LT3042 is an ultralow noise, ultrahigh power supply ripple rejection (PSRR) low dropout voltage linear regulator. Its unique design features ultralow spot noise of only 2nV/√Hz at 10kHz and 0.8μV integrated output noise across a wide 10Hz to 100kHz bandwidth. Low frequency PSRR exceeds 90dB out to 10kHz and high frequency PSRR exceeds 75dB out to 3MHz, quieting noisy or high ripple input supplies. The LT3042 delivers up to 200mA output current with a 350mV dropout voltage at full load, across a wide 1.8V to 20V input voltage range. The LT3042 utilizes LTC’s proprietary LDO architecture – a precision current source reference followed by a high performance unity gain buffer, resulting in virtually constant bandwidth, noise, PSRR and load regulation performance independent of output voltage. In addition, this architecture permits paralleling of multiple LT3042s to further decrease noise, increase output current and spread heat on a printed circuit board (PCB).

LTC3402 – 2A, 3MHz Micropower Synchronous Boost Converter - [Link]

 

 

3 Mar 2015

AD5592R-600x212

by Martin Rowe @ edn.com:

Multifunction data-acquisition systems have been around for a long time as stand-alone instruments, plug-in cards, cabled computer peripherals, and embedded in systems. Such systems are often designed with separate ADCs, DACs, and digital I/O devices. Many microcontrollers include ADCs and DACs, but that locks you into using that device. The AD5592R from Analog Devices combines all of these I/O functions, letting you use one chip to design measurement-and-control functions into systems.

A data-acquisition system on a chip - [Link]

3 Mar 2015

5be3a19d70fc806c83a3c5823976de5e_large

The Qduino Mini is the first tiny Arduino compatible that has a built-in battery charger & fuel gauge.

The Qduino Mini is perfect to embed in your electronics projects, it’s super small, inexpensive, has a battery connector & charger built-in, & a fuel gauge that can tell you when to charge the battery!

The Qduino Mini is Arduino-compatible & 100% open source, hardware and software meaning that making and programming your first circuit is a breeze. Hardware is hard, so we decided to make it a little bit easier. The day that the first Qduino Mini ships, all of the design files, including EAGLE board files, schematic, and code will be released under an open source license. Here’s what it includes:

Qduino Mini: Arduino Compatible + Battery Charger & Monitor - [Link]

3 Mar 2015

obr1667_p645

Thanks to a simple adapter, MEC Unimec switches can be used even in places, where their original height wouldn´t be sufficient.

We already know, that Switches MEC Unimec switch in up to eight ways and also that they´re available as momentary or alternate (latching). UNIMEC switches feature perhaps only one “disadvantage” – that on the same PCB no other higher components can be used (which would be higher than the switch). If you´re satisfied with the UNIMEC features, but despite that you cannot use them in your application right for their (low) height, we have for you a solution. It is based on usage of the „16270 extender“. In combination with any right-angle cap of the 16300 series and with a prolonged bezel 16324 (16325,16326) we gain by this combination a switch higher in 4.5 mm. This simple solution is also suitable for cases don´t have high components on a PCB but from any reason it´s advantageous, when some room will be left between a front panel and a PCB (for cooling, …)  Detailed information will provide you the MEC 16324-16326 brochure and the Unimec datasheet. Selected types are in stock and upon request we´re able to provide you any other components from MEC.


MEC extender – and you´re a level higher - [Link]



 
 
 

 

 

 

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