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15 Apr 2014

LT8471by Susan Nordyk:

The LT8471, a dual PWM DC/DC converter from Linear Technology, employs two internal 2-A, 50-V switches and an additional 500-mA switch to facilitate step-down, step-up, and inverting conversions. Each 2-A channel can be independently configured as a buck, boost, SEPIC, flyback, Zeta, or inverting converter.

This broad range of topologies and output configurations makes the LT8471 useful for a wide range of industrial and automotive applications. The converter operates from an input voltage of 2.6 V to 50 V, allowing it to be used with input sources ranging from single-cell lithium-ion to automotive batteries.

The LT8471 is capable of generating both positive and negative outputs. Its switching frequency is programmable and synchronizable from 100 kHz to 2 MHz. The device’s 50-V switches achieve overall efficiencies of up to 85% for buck and inverting applications. Operating from a 6-V to 32-V input, the LT8471 delivers up to 1.5 A at 5 V and 650 mA at –5 V.

Housed in a 20-lead, thermally enhanced TSSOP, the LT8471 costs $3.75 each in lots of 1000 units. An industrial-temperature version is priced at $4.13 in like quantities. Both versions are available from stock.

Multiple-topology DC/DC converter integrates dual 2-A switches - [Link]

14 Apr 2014

Print

By Steven Keeping:

Until recently, a lighting designer looking to take advantage of the efficacy, longevity, and robustness of LEDs for his/her next luminaire was faced with some key challenges.

Among the toughest of these was the need to work out how many discrete LEDs were required to achieve the required “lumen density” (light output per unit area) for the product, and then design a circuit board that took into account the power- and thermal-requirements of this array without consuming too much space inside the lamp. Then the engineer needed to make sure that all of the LEDs in the group produced an identical color to meet the consumers’ expectations.

Today, a simpler solution is at hand. LED makers have introduced a new form of packaging for their high-power devices: the chip-on-board (COB) LED array. In supplying these units, the LED maker has done the work of matching the individual LEDs and designing a suitable substrate to carry the “light engine.” Better yet, COB LED arrays allow LED makers to take advantage of efficiency-enhancing techniques such as “remote phosphor”.

This article reviews the latest commercially available examples of COB LED arrays and considers how the sector will develop in the near future.

The Rise of Chip-on-Board LED Modules - [Link]

14 Apr 2014

Tupta_DC-DC_fig1_575x396

by Mary Anne Tupta:

DC-DC converters are widely used components that convert DC power from one voltage to another, producing a regulated output voltage. These devices are used in many electronic products, including laptops, mobile phones, and instrumentation. Like any device, DC-DC converters need to be characterized by manufacturers and by engineers evaluating them for a design.

Given the increased pressure to develop products that consume less power, design engineers are looking for ways to increase power conversion efficiencies. Thus, numerous measurements are required to characterize the electrical parameters of DC-DC converters.

Simplify DC-DC Converter Characterization - [Link]

14 Apr 2014

af5cc2e8959a44fa322f0e3df13f381b-600x337

Here’s an interesting open source project on Kickstarter the Re:Load Pro by Nick Johnson of Arachnid Labs:

A constant current load for testing your projects. 6 amps, 60 volts and 25 watts in a workbench-friendly package with a USB interface.
The Re:Load Pro is an active load. It acts as a current sink, always drawing the same amount of current regardless of the voltage across it.
Active loads are incredibly useful for all sorts of electronics testing requirements. You can use one to see how a power supply performs under load, check if a battery lives up to its manufacturer’s specifications for capacity or current draw, test motor drivers, or a variety of common constant-current tasks, such as testing LEDs, or even doing electroplating. With computer control of the load, you can even do your own IV-curve tracing.

[via]

Re:Load Pro – A DC active load - [Link]


14 Apr 2014

obr1504_1

If you´re deciding, which fan to use in your application, we have for you a good hint.

Better said, we have any “ideas for top-level types” and they have a name in common – EBM Papst. Fans of German company EBM Papst were introduced to you for example in our article Fans able to operate continuously for 30 years. We´re pleased to announce you, that we gradually increase number of stock types, what will hopefully make your choice of a suitable fan easier and it should also help you in the consequent production thanks to an immediate availability.

To the new types recently added to our stock belong for example:

  • 4650N - universal all-metal AC fan (230V/50Hz/19W) with an air flow up to 160 m3/h, Sintec sleeve bearing. Static pressure up to 80 Pa
  • G2E120-AR38-A4 - powerful radial (centrifugal) fan with a massive aluminium body and a galvanized steel impeller. Also suitable for a continuous operation (S1) and it can be mounted in any position. Frequently used type for example at gas heaters etc.
  • W2S130-AA03-01 - universal powerful AC fan (D 150mm, 230V/50Hz/45W) with an air flow of up to 325 m3/h and a static pressure up to 80 Pa. All-metal construction, maintenance-free ball bearings. Also suitable for a continuous operation (S1)

… and other, which can be found below this article.

Detailed information can be found in the datasheets at particular types.

EBM Papst – the highest quality for an acceptable price - [Link]

14 Apr 2014
ATmega8

ATmega8

by zeptobars.ru:

Microchips – are indeed can be considered a black box – as long as it’s working you normally don’t look inside.
But what if you want to?

Today we’ll show how to “open” chips and what’s inside.

How to «open» microchip and what’s inside? - [Link]

14 Apr 2014

w2aew @ youtube.com writes:

A tutorial on the basics of an inverting and non-inverting summing amplifier using an op amp. The video assumes a basic knowledge of how inverting and non-inverting amplifiers using op amps work. If you are unfamiliar with this, I’d recommend viewing my video on how to easily understand the operation of most opamp circuits: https://www.youtube.com/watch?v=K03Rom3Cs28

Basics of an Op Amp Summing Amplifier - [Link]

14 Apr 2014

ISPnub is a simple to use stand alone programmer intended for flashing AVR controllers in the field directly in the target system or during production. The module has only one button and two leds as user interface.

Features

- No external power supply needed. Uses voltage provided by target (1.8V to 5.5V).
- Programming counter. Limit possible programming cycles. After allowed cycles, no further programming is possible (module has to be erased/reprogrammed).
- One-button-programming: connect – push button – wait for red led off.
- Simple LED schema:
- green on = ok
- green blink = counter expired
- red on = programming
- red blink = error
- Define programming with simple script. Script converter generates HEX file for module.
- Load module with any ISP programmer which supports ATmega1284p
- 120kB memory space for programming data

ISPnub – Stand-alone AVR In-System-Programmer Module - [Link]

13 Apr 2014

Ray Wang @ youtube.com writes:

This is Part 2 of the NeoDen Tm-240A pick and place machine demo. This time I am using it for a production run to assemble the OpenSprinkler Pi circuit board. Details can be found in this blog post: http://rayshobby.net/?p=6688

NeoDen TM-240A Automatic Pick and Place Machine Demo - [Link]

13 Apr 2014

In the first of a series of videos tutorials on microphones, Doug Ford, former head designer at Rode Microphones explains the basics of how microphones work, the different types – carbon, dynamic, ribbon, condensor/electret, and how the omnidirectional pattern works. Also, the internal construction of a high end measurement microphone.

EEVblog #602 – Introduction to Microphones - [Link]



 
 
 

 

 

 

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