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This heavy duty segway features like 6 car rims, which probably slows it down but innovative.

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And check out this Segway Centaur, it’s the shi*!

via HackedGadgets

This video shows how vulnerable an RFID credit card is because it’s not very well encrypted signals. I am sure the makers of RFID credit cards will change this soon but until then, make sure to keep your RFID credit cards in your metal business case or an Altoids can. Great thing, I am still old-school and haven’t used an RFID credit card.[via] Consumerist

Hi all,I’ve been busy building this “online stock” market over at SiteHoppin.com.

Go check it out as we just launched it…and I need some rest from 5 straight days of ridiculous coding…

SiteHoppin Beer Stocks are “internet stocks”, we call IUVC (Internet User Venture Capital), that allow you to buy into our new company without having to invest millions, unlike Venture Capital.

Basically, when you buy Beer Stocks, you become co-owners of SiteHoppin.com. We probably won’t let you run the site, but we are giving every internet user an opportunity to invest in one of the fastest growing web sites on the internet.

You can read more about it on our Beer Stocks FAQ.

Check out this cool little hack, it’s an open-source motor controller for an electric bike. There’s no pictures of a finished version but can’t wait to see this circuit in action!

n brief the PicOx is a PicAxe 08M based digital Controller that performs an ADC of a Hall-effect throttle and an ADC of a Hall-based current sensor. These two parameters determine the “Mark” value of a 15Khz PWM signal that does the switching to the Output stage. At the end of the project the Controller can sustain 48V @ 75 Amps repeatedly for approx 5 second bursts and is really only limited by the In-Line breaker that cuts the supply voltage, though the entire system’s overall design objective is met reliably at 48V 50Amp operation…

via HackedGadgets

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Here’s a funny cheap lie detector you can make. I don’t know if it really works since there’s no circuit diagrams but you can find lots of lie detector circuit diagrams on the internet like this one I found in about 5 seconds:

Yes, these lie detectors probably won’t work on cats, maybe try dogs.

via dailyapps

The other day, my home had power-outage for like 6 hours. I could go buy a UPS (Uninterruptible Power Supply), or I can make my own UPS using a car battery.

Well, I am just hoping this DIY UPS lasts 6 hours so I can keep using my spare laptop, which shouldn’t need that much power anyways to run off the UPS. But if I tried to run my desktop PC, it’d probably last only 2-3 hours at most, maybe even less.

This DIY is for 220 Volts so you will have to make some calculations to make sure you are providing the correct number of invertors and etc…etc… Btw, if you do use it for powering up your laptop, you don’t need an invertor as most laptops are around 12VDC anyways, which is what car batteries are at. (But you will need to hack an adaptor to the laptop for sure)

In this article we look at how you can cobble together a 220 Volt power supply using components you can buy at your local automotive store. But first it is important to understand a few basics about batteries, and how to convert 12 Volt DC battery supplied electricity into 220 Volt AC current that your household appliances can use.

A twelve Volt battery is a storage device that, when charged, stores electricity in chemical structures that can reverse and release electricity if required. Batteries are typically rated in Amp Hours (AH) - ie how many Amps for how many hours the battery will perform. An inverter is a device which can take the DC current from a battery and convert it into 220V AC current for your appliances.

To calculate how many batteries you need, and how big an inverter is quite simple. Investigate the specification plates on the back of each appliance. In the case of my laptop, the power supply is a 90W unit.

For an inverter one can work on a rule of thumb that to produce 100W will require approximately 10 Amps, hence in reality the lap top requires about 10 AH of battery life per hour. With a 90 AH battery one can therefore expect about 9 hours of power before the battery provides too little current to keep the inverter going. But it is not this simple.

[via] scienceinafrica