Tachometer generators (or tachogenerators) are electromechanical devices which output a voltage proportional to their shaft speed. They are used to power tachometers and to measure the speed of motors ...

The tachometer feeds its signal to a control that adjusts its output to the DC motor or AC inverter motors accordingly (called "closed loop feedback" control). Tachometers can be of both the contact ...

This tutorial will guide you through the process of building a tachometer around an Arduino. Tachometers are used to measure rotation rate in Revolutions Per Minute (RPM). You don’t need much in ...

It’s the latest in instrumentation for the well-appointed shop — an acoustically coupled fast Fourier transform tachometer. Sounds expensive, but it’s really just using a smartphone spectrum ...

For something that does exactly one task — charging your device while you’re on-the-go — a portable charger has a lot of specs. There’s how much power your power bank can hold, how fast it ...

Hoarding documents or rendering endless video: the best portable SSDs give your workflow some much-needed breathing space. And if you’re in the market for a storage expansion, this is the list you ...

To get things up and running again, you need a portable generator. The quietest, lightest, and most powerful 2,200-watt generator we tested is easy to start, and the Bluetooth app makes monitoring ...

He covers the gamut of gadgets and is a notable reviewer of mobile accessories and portable audio products, including headphones and speakers. He's also an e-reader and e-publishing expert as well ...

Need an easy and budget-friendly way to stay cool? Consider a portable air conditioner. These are the best ones we’ve tested. Laboratory Technical Project Manager Gianmarco Chumbe has been part ...

Best Buys Up your leisure game and head into the great outdoors with our pick of the best outdoor speakers. Best Buys If you miss the iPod Touch or want to up your portable music player game, we've ...

Used for transport as well as backup and additional storage, portable hard drives rival the capacity of many internal hard drives. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction ...

What Hi-Fi?, founded in 1976, is the world's leading independent guide to buying and owning hi-fi and home entertainment products. Our comprehensive tests help you buy the very best for your money, ...