Recent content by hyphagon

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    Why am I blowing a laptop powerpack with dc water pump?

    Hi, I have a water pump rated 12v dc 2.3A. I tried using Microsoft Surface powerpack rated at 15v dc 2.5A to power it. Pump just started pulsing. I removed the water pump and checked the voltage coming out the powerpack and it was fluctuating between 0 and 15v. Thought I had a dud powerpack so...
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    Boosting a petrol generator with a car battery?

    Hi All, So i am looking to buy a petrol generator to run a 2.2KW electric motor. I was thinking of getting a 3KW model which under normal conditions this should be ok - but on start up I've been told an electrical motor draws 6 to 10 times the normal load, which is way too high for the...
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    Quick-Release Fittings for Wood Supports on Walls

    Hi all, Does anyone know of a quick release fitting that can replace a screw thread? I'm thinking along the lines of a bayonet fitting but any other ideas would be great. Looking to put pieces of wood sticking out perpendicularly from a wooden wall (railway sleepers) to act as supports for...
  4. H

    Why can't I substitute a Laplace transform into an integration?

    Yup, I integrated it by mistake. That now makes it equal zero incidentally. Awesome, Thanks for for that. Makes sense now.
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    Why can't I substitute a Laplace transform into an integration?

    Hi, I was given the attached question and have given my wrong attempt at the answer. I know how to work the answer out (also shown) but I would like to know why my first attempt is wrong. Many Thanks
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    CD/DVD internal drive case material? Steel?

    Hi, I was wondering if anone knew what an internal CD or DVD drive case is most commonly made of. I was hoping to use it to do some welding so am hoping it is steet but not sure. Cheers
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