Sunday, January 23, 2011

CrazyEngineers Forum

CrazyEngineers Forum

Bank wire

Posted: 23 Jan 2011 09:40 AM PST

can any one explain me about bank wire and how it can be done?

Hayabusa: Probe brings samples from asteroid back to Earth

Posted: 23 Jan 2011 09:10 AM PST

For the first time in the history of space research, Japanese scientists at Institute of Space and Astronautical Science have brought back the pristine samples from a near earth asteroid named 25143 Itokawa. This was feat was achieved by the space probe Hayabusa (Falcon in Japanese) loaded with ion powered engines. The space probe was [...]

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my concept on electronic devices

Posted: 23 Jan 2011 07:28 AM PST

well........
this thread is for to explain electronic devices
this is actually idea of akd,this is introduction lets start it

there are 3 types of devices
1.controlled devices
2.half controlled devices
3.uncontrolled devices
lets know about uncontrolled devices
uncontrolled devices: these devices are called as uncontrolled because they can be only start by switching on
this can be known with the examples like diodes etc...,
now time for half controlled devices
half controlled devices: these are called as half controlled because we have all the controls on on characterstics but not off the main examples are scr's,igbt's etc...,
now coming to controlled devices
controlled devices: these are devices which are controlled totally in on and off
i am not well in this examples

in my view all the electronic devices works with uncontrolled devices and all passive and active components
these half controlled devices are used in solar components and inverters

this is basic concept on these types i am interested in half controlled devices mainly scr
scr:scr is silicon controlled rectifier
this is 4 layered device the symbol is shown below

scr is having three main parts
1.gate
2.anode
3.cathode
as all know cathode and anode and there properties i am discussing about gate
gate is one of main part in scr
when we give all the voltage to scr to overcome junction2 it will be more danger to scr
so we give gate current
now coming to mode of operations
there are three states in operation mode
1.on state
2.forward blocking state and
3.reverse blocking state

on state is always clear because the name indicates that it is in on state
coming to forward blocking state
this state is the depletion layer resistance state
to overcome this state we use gate current and giving voltage to the anode and cathode
then on reverse blocking state is reversing the signs in anode and cathode panels

there is many interesting topics on scr but i am stoping here
if any more doubts or for any more concepts in this topic leave a post in electrical and electronic section i will update it


@akd: this is my personal thanks for you akd for motivating me
@CEans: if there any mistakes in my concept please help me to know because i am in the bottom of this education i need to improve a lot because i am not a professional in electronics concepts
and this post is for giving a basic concept i had in this topic

Use Firefox, Chrome, Safari, Opera On CE. No IE, Please!

Posted: 23 Jan 2011 06:40 AM PST

One of the big issues we have faced ever since CE’s inception is to make it usable for everyone and also a big part of it is browser compatibility. However that resulted in making changes to the site and extra work just to make the site look fine in all the browsers. The most trouble [...]

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vjti techfest

Posted: 23 Jan 2011 06:26 AM PST

'Technovanza' , VJTI's annual technical festival, is back.
After IIT's techfest,this is the 2nd best fest in Mumbai.
It is on 4th, 5th & 6th February.
This time it includes not only TECHNICAL but also MANAGERIAIL events.
For registration details please visit Technovanza

vjti techfest

Posted: 23 Jan 2011 06:25 AM PST

'Technovanza' , VJTI's annual technical festival, is back.
After IIT's techfest,this is the 2nd best fest in Mumbai.
It is on 4th, 5th & 6th February.
This time it includes not only TECHNICAL but also MANAGERIAIL events.
For registration details please visit Technovanza

e-Camouflage To Make Tanks Invisible!

Posted: 23 Jan 2011 05:10 AM PST

The E-ink Triton developed by the MIT Media lab is generally used as an electronic paper in e-readers. But now a days, there is a military use of almost anything. Britain based arms company BAE Systems is trying to develop a technique which will allow E-ink to provide camouflage and disguise to armored vehicles like [...]

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Charging mobile phones with light energy

Posted: 23 Jan 2011 04:53 AM PST

hi i am doing my third year ECE and i went through the topics/ideas for project ...thank you ,that was quite informative .. but i wanted to do something connected with light . so thought of converting the light radiated from various sources to electricity so that it can be used to charge cell phones or any other toy like thing... but i have no idea how to proceed or is it practically possible to implement such a thing ... can any one help me out plz :)

hi im asha!!!!

Posted: 23 Jan 2011 04:42 AM PST

hi friends ... im asha doing my 3rd year electronics and communication engineering :)

Boiler accessories

Posted: 23 Jan 2011 04:21 AM PST

Boiler Accessories
Boiler accessories are those components which are
installed either inside or outside the boiler to increase the
efficiency of the plant and to help in the proper working
of the plant.
Various boiler accessories are:
1) Air Preheater
2) Economizer
3) Superheater
4) Feed Pump
5) Injector

World’s First Commercially Viable Transparent Cement

Posted: 23 Jan 2011 04:10 AM PST

Italian company Italcementi has invented the world's first commercially viable transparent cement. The company demonstrated this wonder at the Shanghai World Expo and made heads turn. The cement is made from a "secret" innovative technology developed by Italcementi whereby a novel ready mixed product is used. This product gives scope for bonding a light transmitting [...]

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Boiler Mountings and Accessories

Posted: 23 Jan 2011 04:00 AM PST

Boiler mountings are the machine components that are mounted
over the body of the boiler itself for the safety of the boiler and for
complete control of the process of steam generation.
Various boiler mountings are as under:
1) Pressure gauge
2) Water Level Indicator
3) Fusible plug
4)Safety Valve
i) Lever Safety Valve
ii) Spring Loaded safety Valve
5) Steam stop valve
6) Feed check valve
7) Blow off cock

CrazyEngineers is now 90,000 Members Strong and Growing

Posted: 23 Jan 2011 03:10 AM PST

We at CrazyEngineers are proud to announce that today afternoon CE completed 90,000 member registrations and has started counting further. I would take this opportunity to mention that CE has grown over the years mostly through word-of-mouth publicity. We haven't taken any great measures to market CrazyEngineers proactively. CE is thankful to the members, authors, [...]

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Ebook for ISDN and Broadband ISDN by William Stallings

Posted: 23 Jan 2011 02:10 AM PST

Does anyone of you have the torrent or download link for the book:
ISDN and Broadband ISDN with Frame Relay and ATM by William Stallings.
Please post.

One litre car by Volkswagen

Posted: 23 Jan 2011 01:50 AM PST

Recently after the price hikes in petrol the first thing comes to our mind is "now we need a more fuel efficient vehicle." Since we are so used to comfort we are not going to step back towards bicycle or walking again. To our pleasure Volkswagen has already started thinking over this idea. In 2002 [...]

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