Wednesday, June 27, 2007

Fixed Voltage Regulators

Use a voltage regulator to obtain a fixed voltage supply (at <1.5>


In a previous article we covered how the LM317T voltage regulator chip can be used to obtain a fixed voltage from a variable supply. Looking at a typical renewable energy system 12V battery bank, the output from the batteries can rise to 15V+ when they are being heavily charged. In order to power lower voltage devices from such a battery bank, some kind of voltage regulation is essential.

LM317 / LM317T

The LM317T is a very common voltage regulator (available from the REUK Shop) used to obtain a fixed voltage of between 3 and 40 Volts set using a couple of resistors. Click here to read up on using the LM317T to regulate voltage.

Fixed Voltage Regulation

While the LM317T is relatively simple to use, having to add a couple of resistors adds unnecessary complexity if you just want a fixed voltage of say 5 Volts at around 1 Amp - for example, for a simple solar battery charger powered from a 12V solar panel or 12V battery bank.

L7812CV 12V 1.5A Voltage Regulator

Permanently fixed voltage regulators are available which require no resistors - the output voltage is internally fixed. The L7800 Series of positive voltage regulators can handle an output current of up to 1.5 Amps, and regulators are available with output voltages of 5, 5.2, 6, 8, 8.5, 9, 12* (pictured above), 15, 18, and 24 Volts.
* A couple of volts are dropped (i.e. lost) in these regulators , so the 12V regulator cannot be used reliably with a 12V battery bank to obtain a fixed 12V ouput.

These fixed regulators are available cheaply (well under £1 each) and are very simple to use in practice.

L7812 12V fixed voltage regulator

Using an L7806CV Voltage Regulator

The L7806CV is a voltage regulator from ST which will provide a fixed output of 6 volts (5.75-6.25V in reality) from an input voltage from 9V to 35V. Therefore, it it suitable for use for a 4 AA Battery Charger to be powered from a 12V solar panel or battery bank.
L7806CV used in a 4 AA battery charger

Further Information

The L7800 Series Positive Voltage Regulators Technical Specifications (PDF) can be downloaded here.

http://www.reuk.co.uk/Fixed-Voltage-Regulators.htm

Power 12V LED Spotlight with 4 AA Batteries

Use a DC-DC converter to step up the voltage from 4 AA batteries to light a bright 12V LED spotlight

12V LED spotlight bulbs are fantastic for off-grid lighting needs. They are cheap, use just 1 Watt of power, cast a bright white light, and 12V LED lighting circuits are very easy to implement. The only problem is the need for a 12 volt power source - typically a 12V sealed lead acid battery.

These are typically large, heavy, difficult to handle, and expensive. In this article we will investigate how a DC-DC step-up converter can be used to enable a 12V LED spotlight bulb to be powered by four inexpensive rechargeable AA batteries.

5V to 12V DC DC Step-Up Converter

In order to step up the voltage output from four rechargeable AA batteries from around 5 Volts to the required 12 Volts the following circuit is used.

5V to 12V Step Up Converter using an LT1073-12 IC
The key component is the LT1073-12 DC/DC Converter Chip from Linear Technology. Click here for the comprehensive LT1073 Specification Sheet which includes many example circuits using this chip.

LT1073-5 DC DC Converter Chip

This £2 device (the 5V output version LT1073-5 is pictured above) requires just a few off-the-shelf components and operates with supply voltages from 1V to 30V.

The only additional components required to use an LT1073-12 as a 5V-12V DC/DC converter are a 150uH inductor, two 100uF capacitors,and a 50 Ohm Resistor. Total cost of these components is around £1.

Powering an LED Spotlight with 4 AA Batteries

In order to light a typical 12V LED spotlight with 4 AA rechargeable batteries, the 4 batteries (in series) are connected as the input of the circuit. At a nominal 1.2V each these batteries will easily provide the 5V required when fully charged, and the circuit will continue to operate even when the batteries are virtually drained providing just 4V. The LED spotlight bulb is connected directly to the output from the circuit.

5V to 12V DC/DC Converter,

Above is shown the completed circuit put together on prototyping breadboard. The rechargeable batteries were placed into suitable battery holders, and the LED spotlight bulb plugged into an MR16 ceramic bulb holder.

Power Efficiency of this DC/DC Converter

Stepping up from 5V to 12V comes at a price - a loss of energy in the converter circuit. In the example introduced above, an input current of 278 mA at 4.92 Volts is converted resulting in an output current of 70 mA at 11.69 Volts flowing through the LED spotlight bulb. According to Ohm's Law, power is equal to voltage multiplied by current, so the batteries supply 1.37 Watts of power of which 0.818 Watts is used in the LED bulb - a power efficiency of around 60%.

Using Solar Power

Recharging the four AA rechargeable batteries can easily be achieved using a suitable 6V Solar Panel making this set-up perfect for renewable shed lighting or other off-grid lighting applications where light is not needed for more than a few hours per day.

Powering a 12V LED spotlight bulb from 4 AA rechargeable batteries connected to a 6 volt solar panel
As the schematic above shows, the power switch for the LED spotlight bulb is located before the DC/DC converter so that no energy is wasted in the converter circuit when the bulb is switched off.

As an added advantage, if AA batteries are required for other devices, the batteries from the lighting circuit charged by solar power can be used and replaced with another set of batteries for charging.

http://www.reuk.co.uk/Power-12V-LED-Spotlight-with-4-AA-Batteries.htm

Power Inverters

Find out about the uses of power inverters in renewable energy generation


A Power Inverter is used to convert low voltage direct current (DC) voltage (typically from a 12/24V battery bank or direct from solar panels or wind turbines) into mains power (220-240V AC in the UK, 110V AC in USA). This is very important as it permits you to power domestic appliances such as computers, televisions, lighting and so on from your renewable energy source.

Low voltage DC appliances are available and typically used in mobile homes and caravans, but they are much more expensive, need to be bought in addition to existing appliances, and much thicker cable is required to carry the electricity around. Therefore power inverters are used to enable existing domestic appliances to be powered by a low voltage DC source. Inverters with conversion efficiencies in excess of 90% are available, so little power is lost going from DC to high voltage AC.

Prowatt 12V Power Inverter

There are two different kinds of power inverter: a Modified Sine Wave Inverter (MSW) and a True Sine Wave Inverter (TSW). Modified sine wave inverters are much cheaper than true sine wave inverters, but the AC electricity they output is not as clean and can therefore cause interference with some appliances. True sine wave inverters usually output cleaner (i.e. less power spikes) power than even mains electricity and so all appliances can be powered by a TSW Inverter.

75 Watt 12V Mini Inverter

Mini Power Inverters are available rated down to as little as 75 Watts (continuous power output, 150 Watts surge) which can be plugged directly into a car's cigarette lighter socket to power a small device such as a GPS systems or personal stereo. These are available for as little as £20.
Pure sine wave inverters are available rated at many kilawatts and can cost tens of thousands of pounds.

Good quality inverters are fitted with low voltage protection to prevent batteries being discharged too deeply, and over voltage protection to prevent the inverter being damaged. The most expensive multi-kW inverters come with fitted LED displays to show the DC voltage and the amps being fed in.

http://www.reuk.co.uk/Power-Inverters.htm

Solar Water Heating Pump Controller

Build an electronic pump controller for a solar water heating system


Any solar water heating system (DIY or otherwise) with a pump must have an electronic controller of some sort if everything is to run optimally.

Solar Water Heating Controller

This controller detects the temperature of the solar panel as well as that of the tank which stores the heated water. Whenever the solar panel is hotter than the stored water, the pump should run to send hot water from the panel into the hot water tank. However, when the stored water is hotter than the solar panel, the pump (pictured below) should be off since the stored water would otherwise be cooled by the panel.

Pump for solar hot water system

Since this is a very simple concept, it is possible for anyone to build their own solar water heating pump controller relatively easily, and very cheaply. 12V 5 Watt pumps are available which can be powered directly by similarly rated PV Solar Panels providing completely renewable energy water heating.

Solar Water Heating System Pump Controller Circuit


Pump controller for solar hot water system

The circuit diagram displayed above is from the Silicon Chip Online article entitled Pump Controller for Solar Water System. (Click on the circuit diagram to view a larger printable version).

This very simple circuit is made up of just a few components. Key are the two temperature sensors (LM335Z) which are used to measure the temperatures of the solar panel and the water tank, and the comparator chip (LM393) which compares the two temperature readings. An STP60NE06 mosfet (a type of transistor) is used to turn on the pump when triggered by the output from the comparator.

When the temperature of Sensor 1 (solar panel) is higher than the temperature of Sensor 212V solar water pump is activated pumping hot water from the solar panel to the water tank as desired. When the temperature of the water tank is higher than that of the solar panel (for example at night) the pump is off.

(water tank), the

LM335Z Temperature Sensors

LM335Z temperature sensor
The LM335Z temperature sensor (LM335Z Datasheet PDF available here) will accurately measure temperatures between -40 and 100 degrees Celcius.
The voltage measured between the ground and the positive terminals of the LM335Z increases at 10mV per °C. Since absolute zero is -273°C, at 0°C, the voltage measured at 0°C is 2.73V . At room temperature the voltage will be 273 + 20 = 2.93 Volts etc.

Since every sensor is slightly different, the circuit includes a couple of 10k variable resistors

which can be used to set the voltage output of the two sensors used so that they give exactly the same reading when they are at the same temperature.
Circuit without the variable resistors

Since the sensors are accurate to within 1°C, the variable resistors (trimpots) can be left out to simplify the circuit as shown above. Put the sensor with the higher output voltage at a particular temperature as Sensor 2 so that if both sensors are at the same temperature, the pump will be off.

Sensor 1 should be stuck against the copper pipe as it leaves the solar panel, and Sensor 2Note that water + sensor = broken sensor)

should be connected to the outside of the hot water tank underneath the insulation. In this way the two sensors will measure the temperature of the water pretty accurately without getting themselves wet. (

Putting the Controller Together

Pictured below is the complete circuit put together for testing on prototyping breadboard .

Prototype solar pump controller circuit

For testing purposes the two temperature sensors have been placed side by side on the breadboard, and a 12V LED Spotlight Bulb is used instead of the hot water pump.

Since the two temperature sensors are at the same temperature the pump is off. The 1 MOhm resistor across legs 1 and 3 of the comparator chip provides 12mV of hysteresis - i.e. the readings from Sensor 1 and Sensor 2 have to differ by at least 12mV (1.2°C) for the output from the comparator chip to be changed.

Heating sensor 1 (solar panel) a little to activate the pump

When Sensor 1 (solar panel) is warmed up slightly by the heat of a finger, the light bulb used in this prototype turns on as it should.

Modifying the Pump Controller Circuit for 240 VAC pump

If the hot water pump is a 220-240 Volt AC model (or 120 VAC for US visitors), then this same circuit can still be used by using a 12V relay (and diode) in place of the 12V pump in the circuit. When the temperature of the solar panel sensor is higher than that of the hot water tank, the relay will be triggered supplying electricity (from an external 240 Volt AC source) to the hot water pump.

Buying the Controller Components

If you are interested in building your own pump controller and you need to buy some or all of the necessary components, contact us and we will put together a package for you from the REUK Shop.

http://www.reuk.co.uk/Solar-Water-Heating-Pump-Controller.htm

Relays and Renewable Energy

Find out more about relays and their uses in renewable energy applications


A relay is a type of electrically operated switch which is controlled by an electronic circuit. Within the relay is a coil of wire which generates a magnetic field when a current flows through it. If sufficient current at the correct voltage flows through the coil, the generated magnetic field attracts a metal lever which changes the position of the switch.

Schematic of the purpose of a relay circuit

The advantage of a relay is that it permits a low voltage DC circuit to control a completely separate high-power circuit - for example a 240V AC mains electricity powered appliance.

6 Volt relay
The example 6V relay pictured above could be triggered by a circuit powered by a small 6 Volt Solar Panel or 4 AA batteries, but used to control a 10 Amp 240 Volt appliance such as a large water pump, a fan, or even a large mains powered battery charger to top up a battery bank

which has been excessively depleted.

Practical Relay Application Example

In this example we will look in brief at how a 240 VAC water pump can be used with a water butt in a rainwater or greywater collection system.

Ideally the switch to turn on the pump would be located near to where the water is used rather than at the location of the pump. If, for example, the water is to be used 30 metres away from the pump, it would be a pain (as well as a waste of power and water) to have to walk back to the pump to switch it on and off.

If a switch was fitted into the 240 Volt circuit and lay across (or under) the garden to the point of water usage, there would be a risk of electrocution if the cable was cut accidently, and such [armoured] cable is very expensive.

Remote Water Pump Switch Relay Circuit Plans

As the schematic digram below shows, a practical alternative would be to use a small solar panel (and/or battery) to power a small relay controlled by a switch. Runs of thin (cheap) wire carrying small currents at just 6 or 12 Volts could then be used to connect everything together safely along the length of the garden.

A relay used in a water pumping application. Solar panel powered relay and 240VAC water pump

Circuit diagram for remote switch for 240 VAC water pump

No details on the actual wiring of the 240V water pump are provided here since if you do not know how to do it already, you really shouldn't be doing it! Mistakes with high voltage electricity can kill. If you are unsure of what you are doing, call in a qualified electrician for assistance.

Why Use a Diode with a Relay?


Voltage spike supression diode

When a relay coil is switched off there can be a short-lived high voltage spike of electricity (aka back-emf) which can damage chips and transistors etc in the circuit. Therefore a diode is placed across the relay coil connections to supress this spike.

http://www.reuk.co.uk/Relays-and-Renewable-Energy.htm


Normally the diode does not conduct however, when the relay coil is switched off, any current which would otherwise have attempted to get through the coil is diverted harmlessly through the diode.

TL431 Battery Voltage Monitor

Monitor the voltage of a battery or battery bank using an TL431 (aka LM431) shunt regulator


TL431 Adjustable Precision Zener Shunt Regulator - used as a battery voltage monitor
An TL431 (pictured above) is an Adjustable Precision Zener Shunt Regulator. Its output voltage can be set to any value between 2.5V and 36V with the use of two external resistors (acting as a voltage divider).

With very sharp turn-on characteristics, the TL431 is an excellent alternative to a zener diode in many applications. In this article we will look at how a TL431 can be used to make a very simple battery status monitor.
Click here to view our article on making a battery status monitor with a zener diode.

The full National Semiconductor LM431 Datasheet (PDF) can be viewed by clicking here.
Note that the TL431 is also often labelled as a LM431 and may also be described as a programmable voltage reference.

Using the TL431

The TL431 is most commonly found in the TO-92 packaging pictured at the start of the article - a piece of black plastic out of which emerge three legs. Below the connections are labelled - REF

is the voltage reference.
TO-92 LM431 Connections


..and here below is shown the way the TL431 is represented in circuit diagrams

TL431 Schematic - how it is shown in circuit diagrams

TL431s can be purchased cheaply from almost any stockist of electronic components worldwide. We also have them available for sale in the REUK Shop.

TL431 Voltage Monitor Circuit


TL431 in a Voltage Monitor Circuit

Above is shown the circuit diagram for this TL431-based voltage monitor. The aim of the monitor is simply to light up an LED when a target voltage is reached - perfect for a solar battery charger to let you know when the batteries have reached full charge.
LM431 voltage monitor equation

The simple equation displayed above gives the high limit - in this case the voltage at which the LED will light up. Since the reference voltage (Vref) is fixed at 2.5 Volts in the TL431, the two resistors are simply selected to provide the desired result.

For example, if you require the LED to light up when the input voltage reaches 7 volts, R1 could be set to 1K8 (1,800 Ohms) and R2 to 1K. Multiplying 2.5 by (1+ (1800/1000)) gives 7.0 Volts exactly as required.

Ideally the R1 and R2 resistors used should both be well over 1K Ohm to ensure that the reference input current stays below its 10mA safe use limit.

The resistor labelled R4 in parallel with the LED prevents the LED from glowing softly when the input voltage is still below the switch-on voltage. We used a 1K Ohm resistor in our experiments successfully. (The lower the resistance value used for R4 for sharper the switch-on

The R3 resistor is there to protect the LED from excessive current - we used a 500 Ohm resistor, but the value selected depends on the specification of the LED used and the brightness required.

- i.e. a tiny increase in voltage causes the LED to suddenly light up brightly).

Testing the Voltage Tester

Below is a photograph of a voltage monitor put together on prototyping breadboard using the LM431 to light up an LED when a voltage of 6.25V is reached.

Testing an LM431 Voltage Monitor

A 1K5 and a 1K resistor were used as R1 and R2 respectively to achieve the desired 6.25 Volts limit. A variable voltage source was then used to test the circuit. When the input voltage was 6.26 Volts the LED lit up (as shown above), and when the input voltage fell to 6.25 Volts the LED switched off completely (as shown below).

http://www.reuk.co.uk/TL431-Battery-Voltage-Monitor.htm




Solar Powered Wireless CCTV

Use a solar panel to power a wireless CCTV system

Tiny wireless CCTV cameras such as the one pictured below have many uses from security surveillance to wildlife observation. Thanks to electronics miniaturisation, the images which can be obtained are excellent despite the physical size of the camera, and can be viewed on a laptop or other computer (fitted with a TV card) or on a standard television when connected to the CCTV receiver.

Wireless CCTV Camera

Wireless CCTV Cameras are the perfect application for solar power. A typical wireless CCTV camera requires just 50 to 300mA of 6.5 to 9 Volts DC electricity to operate - usually being powered by a 9 Volt battery, or via a mains adapter (not exactly wireless!).

Unfortunately, as our article High Capacity Alternative to 9 Volt Batteries describes, the capacity of a 9 Volt battery is typically very low - sufficient to power even the most efficient short-range wireless camera for just a few hours. Therefore, a PV solar panel with battery backup offers the optimal solution.

Solar Powered Wireless CCTV System

Since a wireless CCTV camera requires more than 6 Volts to operate, a 12 Volt Solar Panel

should be used. This should be connected to a battery backup so that the canera can still be used during cloudy weather, at night (if it is an infrared camera), and in the early morning and late evening when the sun is low.

Battery Storage


7Ah 12 Volt Sealed Lead Acid Battery (SLA)

Either a deep-cycle sealed lead acid (SLA) or around 8 AA rechargeable batteries (in series) can be used as battery storage for the system. The initial cost of purchase of both options is similar (assuming 8 x 2,700mah AA cells, or a 2.9AH 12V SLA battery) and both have their benefits and problems.

NiMH rechargeables can release hydrogen at temperatures below zero but they are easy to purchase and can be drained fully and recharged 1,000 times.

Lead acid batteries on the other hand are heavy, cannot be delivered via the standard postal service, and should not be drained below around 40% of capacity if they are to last long. But, they cope much better with being trickle-charged, and are available in large sizes for energy hungry cameras which are to be left on 24hrs per day.

Getting the Correct Voltage to the Camera



Arrow China Tops ESMC Customer Preference Survey for the Sixth Consecutive Year

HONG KONG, June 6 /Xinhua-PRNewswire-FirstCall/ -- For the sixth consecutive year, Arrow China received top rankings in a survey conducted by Electronics Supply & Manufacturing, China (ESMC), one of mainland China's most influential electronics industry magazines.

Arrow China was ranked top in the following categories: Most Preferred International Distributor, Best Supply Capacity Distributor, Best Technical Support Distributor, and Best Logistic Service Distributor.

"Receiving the top rankings for the sixth consecutive year clearly reflects our leadership in the electronic component distribution industry in mainland China," said Peter Kong, president, Arrow Asia Pac Ltd. "This recognition validates our ability to serve customers in mainland China as a global distributor with local capabilities and extensive experience. We will continue to do our best to exceed customer expectations and lead the industry by working closely with suppliers, continually investing in customer-facing resources, and delivering product, support, and supply chain services."

Conducted by ESMC annually, the objectives of the survey are to examine the current state of mainland China's electronic components distribution market and provide an overview of customer preferences in selecting a distributor. This year, feedback was collected from 1,028 purchasing professionals serving with leading mainland electronics manufacturing companies in a range of industries including consumer electronics, communications, and various industrial segments.

http://news.moneycentral.msn.com/provider/providerarticle.aspx?Feed=PR&Date=20070606&ID=6999711

Ever younger children crawl to electronics

Children are beginning to use laptops and other electronic devices at younger ages, according to a survey.

EW YORK (CNNMoney.com) -- Children are drawn to newer technology and pick up electronics at earlier ages than ever before, a report released Tuesday said.

The average age that children begin using such devices is 6.7 years old, down slightly from 6.9 years old in 2006, but a huge jump form 8.1 years old in 2005, the year NPD Group began tracking ages.
Zeroing in on the kids

The number of devices in a household has declined in the past two years, and the percentage of children with their own electronic devices has also fallen, even with electronics usage beginning at earlier ages.

However, the survey found that the number of children who own newer technology such as portable digital media players, portable video games, and digital cameras modestly increased in 2007. More established devices like cell phones and DVD players also showed growth among young children.

Children are being exposed to electronics such as televisions and desktop computers as early as 4 or 5 years old, the survey said.

"Kids are drawn to the latest and greatest digital devices just as their parents are," Anita Frazier, an analyst with the NPD Group, said in a statement. "They appear to have no fear of technology and adopt it easily and without fanfare, making these devices a part of their everyday lives."

Some newer technologies such as TV-to-computer devices and satellite radios have failed to catch on with the younger tech-set. Sales of older devices, like film cameras and karaoke systems, continue to fall out of favor when compared with digital cameras and cell phones, the consumer research group reported.

Children were observed using electronic devices, on average, about three times a week. According to the report, children use kids' versions at a younger age, and more frequently, than the adult versions. Top of page

http://money.cnn.com/2007/06/05/technology/electronics/index.htm?postversion=2007060514

Marvell-Based Consumer Electronics Devices Now Feature Seamless Integration with BitTorrent

Marvell(R) 88F5182 SoC Optimized for the Internet's Leading Content Delivery Protocol

SANTA CLARA, Calif., June 4 /PRNewswire-FirstCall/ -- Marvell MRVL, the leader in storage, communications, and consumer silicon solutions, today announced that BitTorrent, Inc. has delivered an optimized software solution for the Marvell(R) 88F5182 system-on-chip (SoC) platform, to be made available for consumer electronics devices such as network attached storage (NAS) devices, set-top boxes, and media vault solutions. Consumer electronics manufacturers that utilize the BitTorrent-certified 88F5182 chipset in their devices will now have the ability to provide a complete media solution featuring compatibility with BitTorrent, the global standard for high-quality content delivery on the Internet.

"There is a growing demand for consumer electronics devices that enable BitTorrent. By coupling BitTorrent with our high-performance SoCs, Marvell is providing a complete digital solution to our customers that will facilitate consumer access to rich multimedia content and data," said Paramesh Gopi, vice president and general manager of the Embedded and Emerging Business Unit, Communications and Consumer Business Group at Marvell.

Designed to power a truly integrated digital experience in the home and small-to-medium-sized businesses, Marvell media vault SoCs deliver unprecedented levels of performance and ease of use on a variety of leading NAS and consumer electronic devices. Marvell SoCs feature a CPU, peripherals, and controllers in a single integrated package, enabling the convergence of storage, networking, and smart media processing for a digital lifestyle. Additional features include a quality-of-service (QoS) architecture that prioritizes real-time audio and video traffic, and a superscalar pipeline that enables high-end imaging applications such as laser printing.

"With an installed base of over 150 million BitTorrent users worldwide, the next generation of Internet-connected devices are integrating BitTorrent to ensure a simple and seamless digital entertainment experience for consumers," said Ashwin Navin, president of BitTorrent, Inc. "Optimizing BitTorrent to work with Marvell silicon at the component-level not only provides manufacturers high-performance and quick time-to-market, but takes full advantage of the entertainment content and commercial content delivery services offered by BitTorrent."

About BitTorrent

BitTorrent is the global standard for delivering high-quality files over the Internet. Millions of users worldwide are using BitTorrent's leading peer-assisted content delivery platform to publish, discover and download digital entertainment content quickly, easily and securely. Founded in 2004, BitTorrent is a privately held company backed by venture capital firms, Accel and DCM (formerly known as Doll Capital Management). The company is headquartered in San Francisco, California. For more information, visit http://www.bittorrent.com.

About Marvell

Marvell MRVL is the leader in development of storage, communications, and consumer silicon solutions. The company's diverse product portfolio includes switching, transceiver, communications controller, wireless and storage solutions that power the entire communications infrastructure including enterprise, metro, home and storage networking. As used in this release, the terms "company" and "Marvell" refer to Marvell Technology Group Ltd. and its subsidiaries, including Marvell Semiconductor, Inc. (MSI), Marvell Asia Pte Ltd (MAPL), Marvell Japan K.K., Marvell Taiwan Ltd., Marvell International Ltd. (MIL), Marvell U.K. Limited, Marvell Semiconductor Israel Ltd. (MSIL), Marvell Software Solutions Israel Ltd., and Marvell Semiconductor Germany GmbH. MSI is headquartered in Santa Clara, California and designs, develops and markets products on behalf of MIL and MAPL. MSI may be contacted at (408) 222-2500 or at http://www.marvell.com.

Safe Harbor Statement Under the Private Securities Litigation Reform Act of 1995:

This release contains forward-looking statements based on projections and assumptions about our products and our markets. Words such as "anticipates," "expects," "intends," "plans," "believes," "seeks," "estimates," "may," "will," "should," and their variations identify forward-looking statements. Statements that refer to, or are based on projections, uncertain events or assumptions also identify forward-looking statements. These statements are not guarantees of results and are subject to risks and uncertainties. Some risks and uncertainties that may adversely impact the statements in this release about the products described in this release include, but are not limited to, the performance, capabilities and adoption of products and the ability of products to facilitate consumer access to multimedia content and data. For other factors that could cause Marvell's results to vary from expectations, please see the sections titled "Risk Factors" in Marvell's quarterly report on Form 10-Q for the fiscal quarter ended April 29, 2006 and other factors detailed from time to time in Marvell's filings with the Securities and Exchange Commission. We undertake no obligation to revise or update publicly any forward-looking statements.

Marvell(R) is a registered trademark of Marvell or its affiliates.

Other names and brands may be claimed as the property of others.

For Further Information Contact:

Diane Vanasse

Marvell Media Relations

408-242-0027

dvanasse@marvell.com

Lily Lin

BitTorrent, Inc.

Director of Communications

415-568-9007

lily@bittorrent.com

http://news.moneycentral.msn.com/provider/providerarticle.aspx?Feed=PR&Date=20070604&ID=6993156

High-tech TV means low-tech trash

WASHINGTON — As new high-definition televisions fly off store shelves, millions of old sets soon could be flying into the trash.

A major change to broadcast television in 2009 — the conversion from analog signals to all digital — is expected to send many Americans to the store for new TV sets. That could mean a flood of outdated TVs, which contain lead-encased picture tubes and other hazardous material, heading into landfills.

"There's going to be an e-waste tsunami that hits America," said John Shegerian, chief executive of Electronic Recyclers in Fresno, California's largest electronics recycler.

Lawmakers and environmentalists already are concerned about the amount of technology waste — laptops, iPods, printers and other gear — in dumps.

So far, TVs have been less likely to end up in landfills than other electronics, recycling experts say.

Although cellphones, computers and other gadgets generally get thrown out or given away when people upgrade, TVs tend to hang around the house if they still work. They're used to play video games or to watch DVDs, or they get plugged into the cable system or hooked to rabbit ears to serve as an extra set.

The latest U.S. census figures indicate that the average household had 2.5 television sets in 2004, a 25 percent increase since 1990. In all, there were 268 million TV sets.

"There's a lot of different uses," said Parker Brugge, environmental counsel with the Consumer Electronics Association. "That's why the number of televisions in consumers' households keeps going up."

But the calculus that leads people to hang on to old TVs could change Feb. 18, 2009.

That's the day a federal law will require all TV stations to start broadcasting only in digital. Tens of millions of old analog TVs will need to be hooked to a cable or satellite box, or fitted with a special converter, to display the new signals.

"That conversion is going to trigger the reality that even if it's working, even if I turn it on and the screen lights up, this is a device that's incompatible with the current technology," said Mark Murray, executive director of Californians Against Waste, a Sacramento-based environmental group focused on recycling. "I do think we'll see a wave of new discards."

Issue under study

How big a wave is unclear. "There is going to be an impact, but what the full extent is we're not entirely sure," said Lanny Clavecilla, a spokesman for the California Integrated Waste Management Board, which is studying the issue.

Consumer-electronics manufacturers are trying to stem environmental fallout. As part of its effort to inform the public about the digital-TV transition, the Consumer Electronics Association has touted its recycling Web site, www.mygreenelectronics.org, which helps people find places to drop off old TVs and other devices.

According to a survey last year by the trade group, 19 percent of people threw their old electronics in the trash.

The rest either gave them away (55 percent), recycled them (18 percent) or sold them (7 percent).

Shegerian, the recycler in Fresno, says the number of discarded TVs can only increase, as prices on flat-panel TVs drop and the digital conversion leads more people to upgrade.

"You have a new influx of televisions coming into the solid-waste stream," he said.

The Fresno facility processes more than 5 million pounds a month from municipal and private collection sites. Partly because of the anticipated growth in discarded analog TVs, the company expanded to Massachusetts and expects to open facilities in 10 other states in the next 18 months.

Hazardous materials

The Environmental Protection Agency says older sets contain a host of hazardous materials. Most states ban leaded cathode-ray tubes — the technology used to power those TV sets — from landfills.

Cathode-ray tubes are encased with leaded glass to block harmful X-rays created in the picture-making process from escaping. The average picture tube contains 4 pounds of lead.

There are lead solder and cadmium in circuit boards, mercury in switches and brominates in flame retardants used on plastic casings. If dumped into landfills, those materials could seep into underground water.

Next-generation TVs — plasmas and liquid crystal displays — don't use cathode-ray tubes to display pictures.

Since 2005, to provide money for recycling older sets, California has required people to pay a fee of $6 to $10 when buying a device with cathode ray. The program has led to a boom in electronic-waste recyclers.

Earlier last month Minnesota enacted an even tougher law, requiring manufacturers to recycle 60 percent of the weight of the electronics they sell in the state, rising to 80 percent the second year the measure is in effect.

Spreading burden

Manufacturers want the burden of recycling TVs and other electronics to be spread among retailers and consumers, and they would prefer a single nationwide standard, said Brugge, the Consumer Electronics Association spokesman.

The trade group says there are uses for old analog TVs as viewers upgrade to flat-panel digital sets.

But Murray, of Californians Against Waste, thinks that the more people learn about the digital-TV conversion, the less enamored they will be with keeping old sets around.

"You're going to see people not only going out and buying a new TV and discarding the one in the family room, they're going to discard the one in the basement too," he said. "We don't have to wait for this avalanche to take place in 2009 — it's happening right now."

http://seattletimes.nwsource.com/html/businesstechnology/2003733420_tvlandfill04.html?syndication=rss


Flextronics buys US rival Solectron for $3.6bn

Consolidation among white-label electronics makers continued Monday as Flextronics, a Singapore-based electronics maker, bought Solectron, a US rival.

Flextronics, which makes products ranging from printers sold by Hewlett-Packard to copy machines sold by Xerox, said it would pay $3.6bn for Solectron, which specialises in higher-end telecoms and computer products.

The cash and stock deal comes amid a period of turmoil in the industry, as the companies that build computers, mobile phones and other electronics equipment on behalf of name-brand clients grapple with fierce price competition and a glut of overcapacity.

Michael McNamara, chief executive of Flextronics, said the purchase of Solectron would allow the company to extend its reach and cut costs.

"It made sense to consolidate the industry," he said. "We have a very strong position right now. We have positive momentum so we are in a position to do something. We viewed Solectron as being very strong operationally with a strong customer base."

The acquisition continues a string of recent transactions by Flextronics. Last year, it bought International DisplayWorks, a maker of liquid crystal displays for mobile phones, for $300m.

In March it sold an 85 per cent stake in Flextronics Software Systems, a software subsidiary, to a consortium of private equity groups led by Kohlberg Kravis Roberts for $900m in cash.

The company has also moved jobs to India and Ukraine to cut costs.

The deal with Flextronics comes as Solectron hunts for a new chief executive following the departure of Michael Cannon in February. Mr Cannon left to lead a new global supply chain organisation at Dell, the world's second-biggest personal computer maker.

Shares in Solectron jumped 15 per cent Monday to $3.88 on news of the Flextronics deal. Flextronics' shares dipped 1.3 per cent to $11.55. They had fallen from a high of $12.16 in January.

The fall came in spite of strong revenue growth at the company.

Flextronics reported sales of $18.9bn last year, an increase of 23 per cent over the year before.

http://news.moneycentral.msn.com/provider/providerarticle.aspx?Feed=FT&Date=20070604&ID=6992909