Here are some more information for Dual Power:

For the woodworking beginner, there are two essential power tools that can make most projects possible. These are a good hand drill and a good router. More than any other two tools, a drill and router are the foundation of a woodworker's tool arsenal because of their versatility.

The Hand Drill

A drill is designed to (obviously) drill into things. A good, reliable hand drill can be used for drilling holes for screws, making decorative holes, and it can even replace biscuit joinery when necessary.

With a drill you can create dowel joinery, which is less sophisticated but certainly just as effective and definitely less expensive.

When it comes to choosing a good hand drill, there are two basic choices to start with - cordless or plug-in. The kind with a plug-in cord is beneficial because you never have to wait for the battery to recharge or deal with weak drilling capabilities when the battery is low.

However, cordless drill are obviously more portable and most come with two battery packs. That way as long as you keep one plugged in at all times, you will not have to do much waiting.

So if you decide on the very popular cordless model, you then have several other choices to make. First, you need to consider the battery power. You can find drills with voltage from 9.6 volts to 24 volts. The higher the voltage the more power and torque you will get as well as longer battery life after each charge.

The disadvantage of higher voltage though, is that the drills are quite heavy and can make it more difficult to use for long periods of time. How the drill feels in your hands may be one of the most important factors in your decision. Regardless of voltage a good hand drill should have a dual speed motor, a reverse motor function, and an adjustable clutch.

The Router

A good router is the other important tool because it can perform so many different functions. For instance, with some practice, a router can help you create decorative edges, make cross-cuts, and cut mortises and create grooves. If you mount the router in a table, your options expand to include making moldings, edge joints, frames, box joints, and even panel doors. The professional quality of a good router will make it well worth the purchase.

There are a few key elements to consider when choosing a good router. First, the power of the motor is important. A 2-horsepower motor will handle most jobs, but a more powerful one will be need for bulk professional work. Another nice feature to have is a plunge feature. This provides versatility within very detailed work. You should also look for a collet-locking button. This will make it possible to adjust the collet with just one wrench rather than several.

So, as you start to create your perfect workshop, the best place to start is with a quality hand drill and router. Once you have those in place and have fully mastered their functions, you will be able to move on to other tools with ease and with expertise.

Are you new to using Makita power tools and eager to learn about their uses? Get more information on power tools, safety tips, and learn how to buy them at reduced rates at http://www.tylertool.com.

Ups Dual Input Connection

Increasing the resilience of uninterruptible power supplies (UPS) often entails installation of a configuration known as Parallel UPS when the outputs of two or more modules (capable of parallel operation) are connected to supply the load via a common ac busbar. A group of parallel UPS modules is referred to as an uninterruptible power supply system. The two basic parallel configurations are known as Parallel-redundancy and Parallel-capacity. Parallel-redundant UPS systems increase resilience.

Resilience of parallel-redundant uninterruptible power supplies can be further enhanced using dual input supplies whereby the same UPS system is supplied from separate rectifier and static switch supplies. Most installations rely on common mains power supplies feeding both the UPS and static bypass but it creates a single-point-of-failure in the design. Should an upstream circuit-breaker trip due to a fault, the rectifier and bypass no longer have a source of ac power. The use of dual input supplies from separately derived sources (even separate substations) removes this issue.

Typically, transformer-based UPS have a dual input facility as standard but in transformerless models it is a factory-fit option as the rectifier and bypass, in this case, rely on a common neutral.

Transformer-based UPS

 The dual input option in a transformer-based UPS can be selected at installation by simply removing a linking connector from its input terminal. The UPS can be powered from two separate ac supply sources because in this type of module the rectifier and bypass are independent of each other. A typical transformer-based uninterruptible power supply has a rectifier with a three-phase input (delta) and bypass supply that may have either a three-phase or single-phase plus neutral input. Some UPS of this type can also operate without a neutral connection.

Transformerless UPS

 In a transformerless UPS the rectifier and bypass supplies require a common neutral connection, made within the module itself. This type of UPS can be installed with a dual input but with supplies derived from the same source, which is obviously not as resilient as if the supplies were originating from separate sources. It does, however, allow a bypass supply to power the load in the event that the UPS has to be temporarily taken out of service for maintenance, service or repair.

Resilience of uninterruptible power supplies is what every power protection project looks to maximise and dual input supplies are just one technique that can be employed to ensure that loads can be kept operational even in the face of system problems such as fault conditions, overload shutdowns or power problems of any kind.

This article was compiled using information available in The Power Protection Guide – the design, installation and operation of uninterruptible power supplies (ISBN: 9 780955 442803). By Robin Koffler and Jason Yates of Riello UPS.

About the Author

Robin Koffler is the General Manager for Riello UPS Ltd the UK subsidiary of Riello UPS (RPS S.p.A) a leading European manufacturer of Uninterruptible Power Supplies and a co-author of The Power Protection Guide(ISBN 978-0-9554428-0-3)- available from Amazon.com

What's the difference between Profire single & dual power ignition coil for my chopper?

I have an Evo motor on my Harley and I have an ignition coil .. I was wondering how I can tell if it was single or dual - how do I know the difference?

If I'm not mistaken your Hog would be dual fire if it is a factory ignition. They fire both cylinders every time even though only one cylinder is on the power stroke. You can buy aftermarket ignitions that fire only the cylinder on the power stroke. I have talked to guys that had those but they said there wasn't a noticeable difference in performance.

Power Interconnects have compact, flexible design.
PowerStrip(TM)/10 UPS/UPT series features space-saving design with 7 or 10 mm stack height and dual leaf blade contacts capable of carrying from 14-23 A per contact at 30°C temperature rise, depending on number of contacts powered. Available on .150 in. pitch in vertical and right-angle orientations for coplanar and perpendicular applications, products offer 2, 4, 6 or 8 power pins as well as ...

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