Dave Kruschke writes:
Yep, no transformer and no hard to get IC. But, … two transistors and other parts are required. I actually found this circuit by accident while roaming Colin Mitchell’s Talking Electronics website (talkingelectronics.com). This website is very rich with examples and explanations of a huge variety of circuits. In fact, this website is so abundant in circuits that later on, I couldn’t find the circuit revealed here. Anyhow, I believe that the TE circuit can be considered “robust” as it works even if different parts are used.
“Joule Thief” – no IC and no Transformer - [Link]
Charge pump ICs offer high-efficiency DC-DC conversion and have a tiny footprint. They offer step-up or inverting conversion for applications with generally low-output current requirements.
Ian Johnston wrote a new post on his blog detailing his bench power supply build:
My workshop has a couple of bench power supply’s, one is an old Farnell TOPS 3D 3-rail tracking job, and the other is a 3-rail CSI CSI3005XIII with Constant Current functions. The farnell is all analogue but has no constant current control, it has current limiting only. The CSI is good but doesn’t allow you to preset the constant current setting and thats what I want. So, rather than buy another PSU I thought i’d design and build my own, something thats directly suited for me and my projects.
Home built bench power supply - [Link]
Software simulator for Electronic Assembly display EA DOG series will bring you a clear image about possibilities of this favorite series.
Usually, when we start working with some monochromatic display with a color backlight, we have to imagine which combination of display/ backlight would suit us the best. It isn´t hard but for sure even here is valid, that “it´s better to see once than to hear three times”.
For this purpose will serve well a simple application StartDog, in which you can “try” for free various EA DOG series displays in combination with various color backlight (including RGB). This application will simplify you choice of a display without useless expenses. Besides a possibility to choice types themselves (with various resolution), it´s also possible to choose 4 basic kinds of “glasses”: STN positive Y/G, STN negative blue, FSTN positive and FSTN negative.
Application StartDog also cooperates with the EA9780-2USB development board and so the text or image displayed on your PC can be seen also on the EA DOG series display.
Detailed information will provide you the EA DOG flyer and the EA9780 user manual.
In case of interest in the EA9780 development board abd the EA DOG series displays, please contact us at email@example.com.
Start with the EA DOG displays for free – [Link]
ricardouvina @ instructables.com writes:
Hello guys! In this instructable I’ll teach you how to make a very simple proximity sensor using infrared LEDs and Arduino.
Simple IR proximity sensor with Arduino - [Link]
Raj @ embedded-lab.com build a mini LED Christmas tree for his son. He writes:
My two and a half year old son loves toys with flashing lights. For this Christmas I thought of making a mini LED Christmas tree for him. This project uses 22 multi-color LEDs which are driven by a PIC12F683 microcontroller using the Charlieplexing technique. The details of the build procedure is described in the following sections.
Making a mini LED Christmas tree - [Link]
56 years of experience, 40 000 standard stock products and 1000 patents reflect in quaility and a wide portfolio of German company LappKabel.
There are many producers of wires, leads and cables, but despite it, company LappKabel belongs to one of the most renowned. What´s the cause? Exceptional place on the market started in 50-s, when company LappKabel started as the first in this segment to name its products (Olflex). Together with high and stable quality, LappKabel has gradually become one of the biggest cable producers in the world.
Cables from Lapp Kabel are widely used in various industry segments like for example food industry (Coca-Cola), tire production (Continental), marine and ports infrastructure (Hamburg), chemical industry, solar and wind energy,…
Quality of copper (cleanness, oxygen content,..) and quality of insulation, stable diameter of a conductor and of insulation in every production batch, alignment of wires and insulation,… all these are factors influencing final properties of cables and in case of products from LappKabel we get the best available level. A common feature of LappKabel products is also an excellent quality for a reasonable price.
Among LappKabel products can be found not only interconnecting and controlling cables (Olflex) but also cables and systems for data transmission (ETHERLINE and UNITRONIC), industrial conectors (EPIC), systems for cable protection (SILVYN), optical systems (HITRONIC), cable vývodky (SKINTOP), marking systems, tools and various other accessories.
The newest addition in our stock are universal flexible leads 0,5/ 0,75 and 1,0 mm2, suitable for any installations in devices.
In regard to a huge portfolio of company LappKabel we keep in stock only a few selected types of LappKabel cables but upon order we´re able to deliver you any LappKabel product in a short leadtime. A help at the cable choice will give you the Lapp Cable Guide.
If a cable, then the Lapp cable - [Link]
By Ashok Bindra,
Over the years, demand for efficient, light, fast-charging, safe, and cost-effective portable power has led to development of many new battery technologies, including nickel-metal hydride (NiMH), rechargeable alkaline, lithium-ion (Li-ion), and lithium-polymer (Li-poly), to name a few. Generally speaking, these new battery chemistries require more sophisticated charging and protection circuitry to maximize performance and ensure safety. Fortunately, equally advanced semiconductor devices to charge and protect them have also been developed.
This article explores the virtues and limitations of the newer battery technologies. It also investigates and reports on new charging solutions for Li-ion batteries from semiconductor suppliers like Maxim Integrated, Linear Technology, and Texas Instruments.
New Battery Charging Solutions for Li-ion Cells - [Link]
By Gina Roos,
Widespread adoption of cameras in smartphones and other mobile devices, together with consumer expectations for higher quality, sharper images are driving the need for simpler designs, smaller sizes, and lower component counts, particularly as many smartphones move to integrate front- and back-facing cameras.
Mobile phone cameras will increase from approximately 1.6 billion units in 2011 to more than 2.2 billion units in 2015, representing 92 percent of mobile phones worldwide, according to Gartner Inc. The market research firm also found that an additional 15 percent of phones would have two cameras to take portrait photos or to enable video chat.
New LED Photo Flash Drivers for Smartphone Cameras Improve Image Quality - [Link]
John Boxall over at Tronixstuff has a series of Arduino tutorials. This chapter fifty-three of a series will show you how to use the TI ADS1110 16-bit ADC with Arduino:
Moving on from the last chapter where we explained an 8-bit ADC, in this instalment we have the Texas Instruments ADS1110 – an incredibly tiny but useful 16-bit analogue-to-digital converter IC. It can operate between 2.7 and 5.5 V so it’s also fine for Arduino Due and other lower-voltage development boards. This is a quick guide to get you going with the ADS1110 ready for further applications.
Tutorial – Arduino and the TI ADS1110 16-bit ADC - [Link]