Archive for the 'Technology' Category

Battery Selection Battery life is often measured by cycle life, the number of full charge/discharge cycles before the battery reaches 80% of its original capacity. Keeping the discharge current relative to the battery’s amp×hour capacity low and the discharge shallow improves battery longevity. Typical 12 V sealed lead acid (SLA) cells, like the ones found [...]

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If you are reading this post, you probably are experiencing decreased range and speed on your Go-Ped electric scooter. I too have experienced these problems, but I am going to share some solutions I came up with. I purchased a Go-Ped ESR-750 scooter this summer for transportation in Mountain View, CA for a summer internship. [...]

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There are many ways to measure a dc-dc converter’s inductor current for use in control. Direct-current resistance (DCR) is one low loss and cost method for measuring this current, it consists of a series RC network in parallel with the inductor. The RC network has some advantages over other methods: it has lower I2R losses [...]

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The prices on front-projectors have dropped to levels where they are comparable to rear-projectors and other display technologies.  Office projectors offer a low-cost alternative to the high-end home-theater projectors and provide sufficient color accuracy and usually brighter picture. The problem that deters many buyers from front and rear-projector systems is bulb life, which is typically 2000 [...]

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As a test to see what I’ve learned at college, I was handed a recent lawn equipment catalog and asked to point out the falsities of a particular ad–a typical breakfast in the Pitel household.  The ad in question was for a fully electric lawn mower.  The mower was featured in a nice two page spread, but [...]

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Engineering open house is an annual event hosted by the University of Illinois at Urbana-Champaign. Each engineering school constructs booths that educate the public (mostly children and their parents) about specific engineering topics. This year I was heavily involved in organizing and creating new exhibits for the Power and Energy Group in the Department of [...]

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I stumbled across Vimeo recently and was pleasantly surprised.  I’m not one to upload commercial content (like ads and music videos).  I was looking for a site that offered fast service and limited compression for my personal DV projects.  Everything else, while important to consider, is secondary: interface, community, ratings, comments, etc.  Previously, I had [...]

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Overview Before starting the review I should give some perspective on the type of person writing it. I am a technology freak, constantly researching the gadgets that can make my life easier (or more complicated – depending on device!). My first real watch, following the Zelda wristwatch, was a Casio calculator wristwatch. This watch served [...]

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Domo-kun                                                 Zune

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I’m sure most of you are already aware that the Zune came out a few days ago. I had several reservations, however, I went to Walmart to play with one and most of those reservations were absolved, I was very impressed with it. The device has a great feel to it and was a lot [...]

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