External Power Adapters

Rechargeable Batteries and Charger

2009-10-08T12:25:00.006+07:00

There are four types of rechargeable batteries: nickel metal-hydride (NiMH), nickel cadmium (NiCad), rechargeable alkaline, and lithium ion.. They come in many different sizes and use different combinations of chemicals. And commonly used secondary cell chemistries are lead acid, nickel cadmium (NiCad), nickel metal hydride (NiMH), lithium ion (Li-ion), and lithium ion polymer (Li-ion polymer).

Sanyo Eneloop 8 Pack AA NiMH Pre-Charged Rechargeable Batteries

The Best Rechargeable Batteries Of 2009

Types of Rechargeable Batteries
NiMH rechargeable batteries typically perform better than NiCads and are free of toxic heavy metals. Generally speaking, NiMH is the best all-around choice for most rechargeable battery applications. As an added bonus, most NiMH battery charger systems can accommodate NiCad batteries too (although the opposite is not true).

NiCads are being phased out in favor of NiMHs not only because they are losing the performance war, but also because of their inconvenience; the heavy metals used within the NiCad are toxic and require special disposal needs.

Rechargeable alkaline batteries have only two real advantages over NiMHs and NiCads: low cost and no need for special recycling. Otherwise, their long-term performance and recharge characteristics make these batteries a poor choice. Rechargeable alkaline batteries also require a special charger, which reminds me: don’t ever confuse rechargeable alkalines with the typical disposable alkaline batteries that are sold everywhere from 99-cent stores to the local grocery market – although some people do it, those batteries cannot be safely charged.

Lithium Ion batteries have great performance and can go unused for long periods without losing their charge. The big drawback is their price; not only are lithium ion batteries much more expensive than other types of rechargeable batteries, but they also require a special charger. Use them for rarely-used or high-drain devices like laptop computers, digital cameras, cell phones or portable television

Rechargeable Batteries Comparison Table
Here is a trade summary of the four basic options to help you decide which rechargeable battery is right for you. (lenpenzo dot com)

Click image to enlarge

Battery Charger
The energy used to charge rechargeable batteries mostly comes from AC current (mains electricity) using an adapter unit. Most battery chargers can take several hours to charge a battery. Most batteries can be charged in far less time than the most common simple battery chargers are capable of. Duracell and Rayovac now sell chargers that can charge AA- and AAA-size NiMH batteries in just 15 minutes; Energizer sells chargers that can additionally charge C/D-size and 9 V NiMH batteries. However, high rates of charging (eg. 15 minute charger, 1 hour chargers) will cause long term damage to NiMH and most other rechargeable batteries.

La Crosse Technology BC-9009 AlphaPower Battery Charger

Best Battery Charger

Rechargeable batteries are susceptible to damage due to reverse charging if they are fully discharged. Fully integrated battery chargers that optimize the charging current are available.

Also, attempting to recharge non-rechargeable batteries has a small chance of causing a battery explosion.

Find on Amazon Rechargeable Batteries and Charger
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Computer Power Supplies

2009-10-08T08:27:00.002+07:00

Computer power supplies is the most critical component, and it may be one of the most overlooked. It is just taken for granted that it will always be there and working properly. A top of the line processor and ultra powerful video card do nothing if a system does not receive the ample, stable power it demands. Having quality components providing and regulating the power supplied to a computer is critical, and this brief overview looks at a few areas worth consideration.

Power Supplies
Computer Power supplies are sold in terms of their total power output, in terms of wattage. Choosing a power supply with enough power shouldn’t be much of a problem, as having more power than you need is never a bad thing.

It just indicates the total power available to the various lines inside the computer. In addition to checking out the total wattage of a power supply, looking for strong amperage ratings on the 3.3V, 5V, and 12V lines is also recommended, as power supplies with identical total power ratings may distribute the power to the various lines in different quantities.

A typical ATX power supply, such as this Coolmax 700W unit, measures 3.35" Height x 5.51" Width x 5.91" Depth and features two cooling fans to not only cool the power supply, but to also help draw hot air out of the computer. A typical mATX power supply, such as this TR2 Series 430W unit, measures 2.5” x 5” x 4” and due to the smaller size features just one cooling fan. mATX cases are generally much smaller than ATX cases, and therefore have smaller power supplies, with generally lower power ratings, and fewer connectors.

The connectors on a power supply also deserve consideration. Up until recently power supplies had a fixed number of connections, and if you needed more, you needed to use splitters to distribute the power to all the components.

Many manufacturers now offer computer power supplies that consume less energy thanks to high quality internal components, advanced designs, and active power factor correction. These units are now able to provide the same power to the components in a computer, but due to increased efficiency, draw less power from the electrical outlet.

Surge Protectors
Surge protectors come in all shapes and styles. The Fellowes Surge Protector protects up to 10 devices from surges, as well as offering line conditioning and ports to protect your phone line.

Uninterruptible Power Supplies
Many people familiar with Uninterruptible power supplies (UPS) know that they can keep a computer up and running during a total power failure, but don’t know what else they do. A continuous UPS always has the devices connected to it running off of battery power, while the batteries are recharged by the normal electrical connection.

A computer system is only as strong as its weakest feature, and many times that distinction falls on the power supply and related components. By choosing a quality power supply, surge protector, and perhaps a UPS, one can make sure that they have adequately strong and stable power to keep their system running now, as well as down the road when upgrades may increase the demand on their system.

Thermaltake W0070RUC TR2 Series 430W Power Supply with 2 Fans

Available on Amazon Computer Power Supplies - Uninterruptible Power Supplies

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Best Universal Travel Adapter

2009-04-15T17:10:00.009+07:00

In different countries different types of converters are used. But the universal ones are made in such a way so that people can use it anywhere, despite of which country you are heading for (100V-250V-50/60Hz). This is probably the reason why the Universal Travel Adapters are so popular. Universal travel adapter allows one to charge up his/her gears.

Two Types of Universal Adapters based on their Functionalities
In electronic good selling stores, people will find several types of universal adapters. Some of the newest products among them include: "Universal Travel Adapter With USB Port" and "Universal AC Travel Adapter".

Universal Travel Adapter With USB Port
Mostly-used by the globe trotters, this product is known for powering up the electronic gadgets with USB plugs. There's no need to bring heavy accessories along, just plug it into a computer USB port!

Another highlight of the product is its affordable price. Anyone can purchase it and can enjoy a trouble-free trip. Since this adapter is made using the latest technology, it offers all the features that a user may require for giving charge to his electronic equipments. The design of this Universal AC Travel Adapter is also quite fascinating. Some of the most striking features of this Universal Travel Adapter include 1 USB port, portable, LED indicator, compact and lightweight, and weight around 85g.

Universal AC Travel Adapter
Compared with the first one, this product is a little bit bulky. People who travel a lot love to use it because it allows to connect different types of plugs to one side, and thereafter by turning the knob selector, a wide variety of plug blades come popping out from its other side. The size of this universal power adapter is small enough to get fitted to your crowded suitcase. The price of this product is also reasonable -around $17.

You may be interested in reading: Power Adapters or Power Supplies

12V Car Battery Charger

2009-04-15T02:03:00.012+07:00

Cutting-Edge Technology - Battery Chargers
All car batteries have required a 12v battery charger. And this is also true of Marine, RV and Power Sports batteries. The high efficiency lead acid type batteries available today require more efficient charging techniques.

The most important factors in the life of your battery, the battery charger is the most valuable tool in saving the life of your battery, getting up and running and cutting your down time. Using the proper charger is crucial to your battery. Some manufacturers of gel cell, solar and AGM batteries will not honor warranties if the proper charger or 12 volt gel cell charger is not used.

High-Quality 12 Volt Battery Chargers
With the change of battery technology the computer chip has found its way into many of the higher quality battery chargers. With the use of microprocessor technology in battery chargers, you could say battery charging has become a science. Your battery will never overcharge and the trickle charge will always be maintained. It is fully automatic with float mode monitoring capabilities and uses high-frequency power conversion technology.

12V Car Battery Charger
Most car battery chargers are simple devices that continuously charge the battery with a few amperes for the duration it is ON. If the charger is not switched OFF in time, the battery will overcharge, its electrolyte lost due to evaporation, and its plate-element will likely be destroyed.

The 12 volt car battery charger circuit below will eliminate these problems by monitoring the batteries condition of charge through its retroactive control circuit by applying a high charge current until the battery is completely charged. When charging is complete, it turns on the red LED (LD2) and deactivates the charging circuit. This circuit is drawn to charge 12V batteries ONLY. Certain emphasis should be taken when wiring up this circuit. They are the connections of the transformer to the circuit board, and those supplying current to the battery being charged. These connections should be made with cables having a large cross-sectional area to prevent voltage-drop and heat build-up when current flows through them. See

Automatic 12V Lead Acid Battery Charger
This battery charger will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge. If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged.

You may be interested in reading: Power Adapters or Power Supplies

What is a power adapters?

2009-03-29T00:53:00.033+07:00

External power adapters are also known as power supplies, is very important to the operation of almost all small electronic devices. In an AC power adapter consists of a small transformer, while the DC power adapter, there are several additional diode. Whether or not a load is connected to the power adapter, the transformer has a magnetic field continuously present and normally cannot be completely turned off unless unplugged.

Why are DC power adapters important?

Power adapaters convert high voltage AC electricity from the wall outlet to the low voltage DC power used to power electronic products, like mobile phones, MP3 players, Personal Digital Assistants (PDAs), digital cameras, camcorders, and laptops.

Unregulated Power Suppy Circuit
A basic full wave rectified power supply is shown below. The transformer is chosen according to the desired load. For example, if the load requires 12V at 1amp current, then a 12V, 1 amp rated transformer would do. However, when designing power supplies or most electronic circuits, you should always plan for a worst case scenario. With this in mind, for a load current of 1 amp a wise choice would be a transformer with a secondary current rating of 1.5 amp or even 2 amps. Allowing for a load of 50% higher than the needed value is a good rule of thumb. The primary winding is always matched to the value of the local electricity supply.

Fixed Power Supply Circuit - power adapter as a basic circuit
The following adapter circuit is a basic regulated 12 volt power supply. It uses a 13 volt zener diode, D2 which provides the voltage regulation. Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This 12 volt adapter circuit can supply loads of up to 500 mA.

This power adapter circuit is also known as an amplified zener circuit.

Variable Power Supply Circuit
A variable power supply with adjustable voltage and current outputs made with the L200 regulator.

This power supply has independent voltage and current limits. The mains transformer has a 12volt, 2 amp rated secondary, the primary winding should equal the electricity supply in your country. The 10k control is adjusts voltage output from about 3 to 15 volts, and the 47 ohm control is the current limit. This is 10mA minimum and 2 amp maximum. Reaching the current limit will reduce the output voltage to zero.

About me

2009-03-27T22:04:00.007+07:00

About The Author

I'm just a blogger to spend my spare times

Contact me

2009-03-27T22:04:00.006+07:00

How to Contact Me

If you have any questions regarding the content in this weblog, about the products that are mentioned, or just any questions at all don’t hesitate to contact me at the following email address: pscircuits@telkom.net.

I’d also love to hear any feedback on the site if you’ve found it helpful or have some ideas about how I can improve the blog in some way.

I will reply to all messages as soon as possible.

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2009-03-26T02:09:00.004+07:00

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