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]
RIGOL DSA1030A is a 9 kHz to 3 GHz Performance Spectrum Analyzer with advanced measurement capabilities. At only $4999 market price, DSA1030A has USB and Ethernet connectivity as well as a VGA outlet. It features a minimum resolution bandwidth of 10 Hz and comes with an all-digital IF design technology to meet the needs for reliability and precision for some of the most demanding RF applications. DSA1030A offers other optional features such as the Advanced Measurement option attainable for applications either in low noise or in narrow resolution and also a built-in pre-amplifier to help on low level signals. The interface is also comparable to other rated analyzers with a large display at 21.6 cm with a resolution of 800 x 480 pixels that in return allows good viewing and easy navigation.
The DSA1030A Spectrum Analyzer offers readily accessible frequency settings. The span control for functions like zooming in/out or even for zero and full span can be attained readily in one click. All the menus can be set quickly and easily. The configuration of the analyzer is also made simple. Just access the marker functions, press the marker buttons and you will see exactly what you expect.
One thing about the DSA1030A Spectrum Analyzer is that changing most of its settings in effect also automatically updates the display settings on the screen to match your desired options. The status indicator is readily available and is always on the screen. No matter where you are on the spectrum analyzer, the status indicator is always provided. Correction settings are also integrated to the analyzer to allow file corrections for antenna, cable or similar as long as it comes with the correct format. Data can be corrected by these settings live in real time.
The RIGOL DSA1030A Spectrum Analyzer comes with standard accessories such as the Advance Measurement Kit (AMK) and USB cable and power cord. It weighs 6.2 kg without the optional battery that can be used for portable operation. In addition, it has a user-friendly preset function that enables users to load their previous measurements. With an exceptional market price, it is safe to say that the DSA1030A Spectrum Analyzer can be used for broad electronics applications present today.
RIGOL DSA1030A Spectrum Analyzer - [Link]
Multifunctional gas soldering tool will help you at many various applications like: soldering, melting, hot-cutting, welding and woodburning (pyrography)…
This quality gas soldering tool provides a freedom of usage for example outdoor and everywhere where no electricity is available. But DREMEL 2000 VersaTip isn´t only a gas soldering tool with adjustable temperature. It is a multifunctional tool, which you can use, thanks to 6 exchangeable tips, for technical and also creative works like: soldering, melting, hot-cutting, welding and woodburning (pyrography), bending of metals, application of heat shrinkable insulations, releasing of junctions locked by an anaerobic sealant (bearings and screws) and many other.
DREMEL VersaTip can be easily and quickly refilled by a widely available liquid butane (the same as used in lighters) and it has a safety lock mechanism against an accidental turn-on. Detailed description will provide you the VersaTip Instruction Manual.
The multifunctional gas soldering tool VersaTip 2000JA can be gained with a free gift now – with the 12in1 multitool – it is only necessary to order item no. 131739.
- DREMEL® VersaTip
- Soldering Tip
- Cutting Knife
- Hot Knife
- Flat Wide Flame Head
- Hot Blower Head
- Soldering Tin with Blue Cap
- Soldering Sponge + sponge box
- Wrenches: 1 x 7 mm, 1 x 8 mm
Gas soldering tool DREMEL 2000 VersaTip now with a gift! - [Link]
Here is an app note from NXP on capacitor bypassing.
Bypass capacitors are applied between the power supply pins VCC and GND of integrated circuits. They reduce both the power supply noise and the effect of spikes on the supply line. They also provide instantaneous current demands of the integrated circuit as it switches. This application note describes the different properties of bypass capacitors and provides a guide to their use.
Properties and application of bypass capacitors - [Link]
The basis for this tube preamplifier started out as a post in the Super simple single stage tube preamp thread on the website Forum. One of the members (see Mark’s 4S Universal Valve Preamps) had suggested building a Super Simple Single Stage Preamp (“4S” Preamp for short) and there was much discussion concerning various tubes, gain, noise, etc. and several designs were presented using various dual triode tubes. Then the proverbial gauntlet was thrown down with the phrase “switch from 12AU7 to 12AX7″. My answer was to design a universal line stage preamplifier that would work well with an entire range of tubes. Thus was the 4S Universal tube preamplifier born.
4S Universal Preamplifier for 12A*7 Tubes - [Link]
Make your own computer speaker system. This simple and inexpensive project will let you set up a small audio amplifier circuit and let more sound out your computer.
A simple audio amplifier circuit based on the LA4440 IC. This circuit will take your computer’s headphone level output and amplify it to drive a pair of external speakers. If you are listening to music or movies on laptops and computers, this is a useful little project for you. Laptop speakers are never loud enough to give satisfying listening. They give users the ability to hear something, but for anything like music or movie soundtracks they are very poor performers. The output from a laptops built in speakers is just too low, and this circuit addresses that low power with some additional amplification.
This circuit uses an LA4440 and some supporting components to give you much more power, while retaining a small package that you can use. The LA4440 is a dual channel audio power amplifier, with low distortion, and a good frequency range. Using 2 channels, the LA4440 will output 6 watts per channel, that can drive much larger speakers than a laptop can hold. When you set up a small enclosure(s), a 12V power supply, and an audio jack connection to the laptop you’ll have a nice enhancement to your laptop audio enjoyment.
Laptop Audio Amplifier - [Link]