Electric Dirtbikes

I had purchased a Razor electric dirtbike 2 yrs ago. Its been ridden/charged every day successfully. 3 months ago we purchased the next larger one (1st one is either 350 watts/amps? The 2nd one is 500 watts/amps) All of a sudden when we get home to ride them, BOTH are not charged. Both were plu

patents

1 when is a patent no longer yours? 2 why should you keep paying to keep what is yours? 3 if you don,t file a patent but build it is it yours are the one who copys it for a patent? 4 not all of us has the money to file must less keep paying after its done so they can take it?

Convert free standing pellet stove to vented propane

I've been advised my 15 year old pellet stove is beyond repair because the motors are hard if not impossible to get and the electronic controls or blower would be likely to go next making the whole process expensive. I'm thinking about converting my pellet stove to vented gas logs (or nonvented) if

Possible Causes for Error in an Incremental Encoder

I just hooked up a new encoder I bought recently and I noticed I was getting twice the PPR I am supposed to be getting. Upon closer Investigation on a scope, I see that during a transition from a high to a low state, there is a very quick spike from low to high, just before where the actual tran

Telecommunications Issue

I use Att for both internet and phone. Here's the problem: On incoming phone calls the call is full of static for 4-5 seconds, then clears up.

More info:

I can hear the person calling in, but they can barely hear me.

This only happens on incoming calls, never outgoing.

It is inte

Welding Across the Chord of a Beam

I just watched something happen that I understand, yet want to make sure I solve it right the next time. I have a crack across a backhoe boom on the same side as the crowd cylinder. In most cases during operation the crack would be under tension. The boom is a fabricated retangular box. The crack ha

Signal Calculation

Hi, anyone remembers how to calculate betwen the range and the signal?

E,g. I have 4-20mA signal. It is 50% when the signal given at 12mA? But how to calculate when the signal is at 4.5mA?

Rgds, Hien

Residential Circuit Debug

I was gone for the day and on my arrival home, one circuit (on one breaker) in my home does not function. No outlets or lights work on the entire circuit. I have replaced the breaker (which does function to turn power on and off) and the GFCI (one in the circuit) with no change. I read voltage of 1

8 Reasons Steel Can Warp in Heat-Treat

And how to minimize them.

Upon heating, steel parts change volume as they change crystal structure (I'll spare you the technical terms and details). When these heated parts are quenched, their internal crystal structure changes again, and that volume change is not necessarily sufficien

US Tops Wind Technology List

From The Engineer - News:

North America was one of the fastest-growing wind power markets in the world in 2009, second only to China, according to a report released today. The 2009 report, entitled Wind Technologies Market Report, was released by the US Department of Energy and

A Quicker Test for Hybrid Batteries

From MIT Technology Review:

It takes years to verify that a new battery technology will last for the life of a hybrid or electric car. That means battery materials that might cost less and store more energy than today's batteries are languishing on lab benches. A new way to tes

Hearing Awareness

My name is Anthony Carolan and I am involved in a small Irish company that is promoting hearing awareness for parents and kids. I would like to draw attention to our website which is dedicated to raising hearing awareness among all generations but especially with our younger people. We provide a