Thursday, March 10, 2011

CrazyEngineers Forum

CrazyEngineers Forum

Newtec To Launch New And Upgraded De-Modulator And Modulator Boards At SATELLITE 2011

Posted: 10 Mar 2011 11:42 AM PST

OEM range will reduce manufacturers' time-to-market and reduce costs

WASHINGTON D.C., and SINT-NIKLAAS, Belgium, 10 March 2011. Newtec, a global industry leader shaping the future of satellite communications, is to launch its updated range of Original Equipment Manufacturer (OEM) products at SATELLITE 2011. The DVB-S/S2 De-Modulator and Modulator boards are targeted at product manufacturers that wish to reduce their product development costs.

The OEM product integration mitigates risks due to the reliability, maturity and future proofing of the boards, and as Serge Van Herck, CEO of Newtec explains it also allows the integrator to take profit from Newtec's efficiency and competences.

He said: "This enhanced offering from Newtec will enable manufacturers to increase their potential market reach and throughput, without having to source specialised resources themselves. This can be costly and time consuming." Mr Van Herck continued: "Governmental product integrators also benefit from off-the-shelf products such as those with very high efficiencies that can be integrated to purpose built products and systems."

Newtec's OEM NTC 7029 and NTC 7139 Modulator boards are mainly targeted at Flyaway and encoder manufacturers wishing to enter the DSNG (Digital Satellite Newsgathering) market. Newtec also offers modulation boards aimed at the DSNG market and boasts an impressive, proven and reliable track record in the broadcast industry.

The De-Modulator boards are specifically suited to Integrated Receiver Decoder (IRD) manufacturers, IP modem and transceiver manufacturers (especially those in the government market), monitoring equipment manufacturers and DTT transceivers. The upgraded boards enable broadcast system houses to build higher function IRDs that support higher data rates and MODCODs (Modulation and Coding).

The IF to L-band conversion boards facilitate extension of market reach and the integrator's product fit, enabling them to re-use already designed products with L-band functionality.

The DVB-S/S2 De-Modulator and Modulator boards support both Advanced Encryption Standard (AES) and Newtec's FlexACM®.

Microsoft Kinect Is Fastest Selling Consumer Electronics Product - Guinness Records

Posted: 10 Mar 2011 11:26 AM PST

Microsoft's Kinect is official the world's fastest selling consumer electronics device. Kinect sells over 133k devices every day and so far, they've sold over 10 million devices and equal number of games all over the world.

Read our review: Kinect Is World's Fastest Selling Electronic Gadget Ever! - CrazyEngineers

Latest Trend In Electronics: Powerful Components That Consume Lesser Power

Posted: 10 Mar 2011 10:37 AM PST

Consumer electronics is rapidly advancing towards development & design of smarter gadgets which are smaller in size. We've already advanced from a room size computer to handheld devices which are multiple times more powerful than the first few computers. This advancement in the world of electronics, in my opinion, has been made possible because of the development of powerful and smarter components that consume lesser power.

Take the Tablets, for example. For me, they are rapidly advancing towards replacing the laptops and we've already been successful in removing the physical keyboards with touchscreens. This was made possible because engineers were able to develop power storages in smaller sizes. The iPad 2 is just 8.8mm thick and yet, it delivers close to 10 hours of battery life.

Do you think this qualifies as the latest trend in electronics? I believe most of the innovation today is based on the development of miniature power sources. Because if we don't develop smaller power sources - we can't expect lot of advancement in design and development of components.

Your take on this, please?

Calendering: Plastic Sheets & Paper Roll Manufacturing

Posted: 10 Mar 2011 06:55 AM PST

Has anyone wondered how plastic sheets or paper rolls are manufactured? Well, the
process is called 'Calendering', heard of it? Yes, it is the manufacturing process by
which plastic or paper sheets are formed. Using this process basically any thickness of sheet can be formed. This process incorporates the use of heavy cylinders and a simple transmission mechanism. In other words the cylinders themselves guide and transfer sheets forward.

The process goes like this. The raw material to be used, present in the form of dough is made to pass through two heavy cylinders, which apply pressure on it and convert it in the form of a sheet.


Usually there are many rollers as you can see in the diagram. The more number of
cylinders the better but the thing to be taken in mind is that the process should be
economical. You should not use these cylinders unnecessarily in your enthusiasm
which can make the set-up complicated and costly.

The processed sheet is then wound on a cylinder and thus the bundle is formed.
Calendering generally takes place hot, because hot plastics often are soft and easy
to shape. As a thumb rule always remember that heated things are easy to work with.
They are easily forged. Even if less pressure is applied you will get superior quality
of sheets. The pressure which is generally applied is about 890N/Cm2.But it actually
depends as to how thin sheet you want. There is also an arrangement some times to
make the cylinders hot so that the plastic does not cool in the process.

You must have seen big rollers guiding the newspapers whenever there is a scene of
paper industry in a movie well, actually you are seeing the calendaring machine.

Still not got? Well, try visiting your local bakery next time.

There is also a type of calendaring called belt calendering applying a pressure of about 1/10 that in hot calendaring.

Some companies provide a thickness of 0.17mm to 1.27mm.The process then is to
smooth, polish and glaze to get the required surface quality.
The products are many and this is the major and possibly single process to make the sheets.

The construction is rugged and the thickness obtained varies from 0.5mm but different
manufacturers claim different ranges. The advantages include no wastage of material.
The process can be stopped at the precise moment you want. So what more do we
want?

Compression molding

Posted: 10 Mar 2011 06:52 AM PST

The words compression and tension go hand in hand for any mechanical system. But
fortunately or unfortunately we have only compression molding. Compression molding is
a process of molding plastics in to desired form. This is actually a type of forging only.

The apparatus essentially usually consists of piston and a block which applies pressure
on the material and acts as a moving component and the mould in which the polymer is
kept it acts a lower part. It is generally kept fixed.

The raw material used is generally thermosetting plastics like polyesters and epoxys the
raw material used is in the form of granules or preform. The material is used in the form
of granules and preform because it is easier to do so. If we use the plastic in the form of
a big dough it will naturally take larger time to melt.

The process consists of following three simple steps The charge is placed in the mould
cavity. Later on, the mould is pressurized so that the charge takes the shape of cavity.
Only that much pressure is applied so as to ensure uniform density of the product. The
material has to be cured and solidified before removing.Lastly; the mould is removed to
get the finished component.

The process is generally performed 'hot' with molding temperature reaching the range
of about 1100 to 2200 degree Celsius. The pressure applied varies from about 3.5MPa
for polyesters and epoxys. But general pressured exerted on thermoplastics is about 14
to 41.5MPa.

The process time required is 12-15 Sec for a small object of 3 mm thick. It may vary
from 7 to 10 min for larger objects.

The process is also done 'cold' but preheating the material reduces the process time
drastically to half. The cold molding cannot maintain high tolerances and has to be
supplemented by binders.

There can be following three divisions of compression molding

1. Positive type 2.Semi positive 3.Flash type. The flash type is the cheapest and most
accurate tolerances can be achieved.

Compression molding products consist of electrical parts, flatware, gears,
buttons, buckles, knobs, handles, electronic device cases, appliance housing,
and large container.

It is used to make moderately curved or flat parts like lift gates, spoilers,
scoops etc.

The advantages include low initial costs. Secondly, there is practically no
wastage and accurate dimensional tolerances can be maintained.

We can apply this technique to composite thermoplastics with unidirectional
tapes, woven fabrics, randomly orientated fiber mat or chopped strand.

Also one of the greatest advantages is its ability to mold large, fairly
intricate parts. Compression molding produces fewer knit lines and less
fiber-length degradation than injection molding. Excellent surface finish is of
course achieved.

However, if you have ever experienced injection molding then you will
come to know that Production by injection molding is much faster. Also this
process is mostly limited to large parts with less or no curvature at all.

Transfer molding

Posted: 10 Mar 2011 06:49 AM PST

Hello everyone ever wondered or for want of a better
word 'compared' various manufacturing process? I guess many
actually do. It makes remembering simple. You only need to
remember the minor differences which set various processes
apart.
One such process is transfer molding. This process when seen
practically is strikingly similar to Compression and injection
molding.
This process is basically a combination of injection and
compression molding.
The simple apparatus consists of a plunger or a piston which
reciprocates in a transfer pot ('Transfer pot' is nothing but the
barrel as in injection molding). The transfer pot has a sprue
attached to it. This sprue then opens in a mould which is already


Prepared according to
required dimensions.
The process consists of basic steps as in the other two molding
processes. The material which is generally a thermoset (In
some cases thermoplastics may also be used) is preheated to a
sufficient temperature to make it soft. As soon as the material
softens, this near liquid material is forced into the mold by the
plunger overhead.
The plastic takes the shape of mold and it is then cured. When
the ready product is cooled to room temperature, it is taken out.

Now let us take into account its similarity with other processes.
Firstly, the process makes use of hydraulic press as in
compression molding and a Ram which forces the material in the
mold using sprue as in injection molding.
However there is one major difference in compression and
transfer that instead of loading polymer in a mold that is open the
polymer in compression molding, in transfer molding we is force
it in a closed mold after it is melted.
The mold is generally a two piece arrangement so that the
product can be removed easily.
The advantages are also mixed i.e.; it is better than compression
molding in time consumed and production capacity than
compression but injection molding consumes less time and can
produce complicated shapes than transfer molding.
Another such advantage is lower scrap produced. Quality can of
course be ensured.
Another related process is known as Resin transfer molding. It
uses unvulcanised rubber as its raw material. The only care we
should take is not to let trapped air in the mold else uniform
material density cannot be ensured.

We can very easily produce covers for electronic components,
also protective covers for pins, studs and other hardware
components.

Galaxy Pop S5570 Tech Specs & Features

Posted: 10 Mar 2011 06:42 AM PST

Samsung Galaxy Pop is one of the lower end mobiles introduced in India by Samsung recently. Priced at Rs. 9000, the phone features-

  • 3.14" screen
  • 600 MHz processor
  • 3MP camera (Fixed Focus)
  • 3G, Wi-Fi, GPS
  • Bluetooth
  • MicroSD
  • 1200 mAh battery
Attachment 47
Attached Images

Samsung Galaxy Fit S5670 Price & Review. Officially Launched In India.

Posted: 10 Mar 2011 06:38 AM PST

Samsung Galaxy Fit (S5670)is one economical phone by Samsung in the Galaxy series. Priced at Rs. 10000, the phone has following features -

  • 3.31" QVGA Display
  • 1300 mAh battery
  • 600 MHz processor
  • HSDPA [3G]
  • 5MP camera with autofocus and flash
  • Wi-Fi & Bluetooth
Attachment 46
Attached Images

Galaxy Ace Officially Available In India. Tech Specs, Review & Price

Posted: 10 Mar 2011 06:34 AM PST

Samsung Ace (S5830) is now officially available in India. Flipkart lists the price at Rs. 15,000 for the following features -

  • Android 2.2
  • 3.5" HVGA display
  • 3G (HSDPA)
  • 5 MP camera
  • 1300 mAh battery
  • Wi-Fi
  • GPS
Attachment 45
Attached Images

hie everyone

Posted: 10 Mar 2011 05:05 AM PST

i am j mulopa zimbabwe. I am currently studying computer science and am in my fourth year. I have 5 years experience as telecoms engineer. I am a music and moviz fan. Its a pleasure to be in this forum.

Working of AC to DC converter using opamp

Posted: 10 Mar 2011 04:44 AM PST

http://focus.ti.com/lit/an/sboa092a/sboa092a.pdf pg number 88.. AC TO DC CONVERTER.. I want to know the working of this circuit

how to run fast your dead pc

Posted: 10 Mar 2011 03:21 AM PST

www.pcz-web.blogspot.com

share with your friends on facebook

Water Treatment Plant

Posted: 10 Mar 2011 03:17 AM PST

I want any plan of Water Treatment Plant.
Can anybody help me its very urgent????:(

Time division multiplexing for analogue signal

Posted: 10 Mar 2011 02:59 AM PST

Hi guys, Im designing an OFDM system and then upconverted at 1 GHz. Now I have an idea of implementing TDM for this 1 GHz signal.

Is it possible, please explain from theoretical point of view and if possible, please help from matlab perspective.

Thank you very much,

A Spam on the name of HDFC Bank

Posted: 10 Mar 2011 01:38 AM PST

Just received this email on the name of HDFC bank

If anyone received this kind of email ,then just ignore it



Dear Valued Customer,

At HDFC Bank, we take the security of your accounts very seriously.

While we continuously upgrade our online security features to ensure you
are always protected, it is also important you understand your role and
obligations to ensure the safety of your information regarding online banking.

Kindly submit the form attached to this email in order to enroll your HDFC Bank
Account in the new online protection System.

If you are using Internet Explorer please allow ActiveX for scripts
to perform all data transfers securely.

Thank you for using HDFC Bank !

Please do not reply to this email.
This mailbox is not monitored and you will not receive a response.

----------------------------------------------------------------------------------------
Copyright © 2010 HDFC Bank. All rights reserved.
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