Reading Datasheets Of Electronic Devices

Most of the present-day electronics designers and application engineers do not find it necessary to look beyond the first page of the datasheets of the electronic components or devices while selecting one for their application. They consider the knowledge of a few major specifications of the device sufficient for the design exercise that they wish to undertake. Though it may be adequate in some cases, the design where the components are chosen without giving due consideration to the information contained in the datasheet may not be the optimal one.

The datasheet of a device reveals its true character and hence its suitability for a given application. In addition to listing down the device parameters, it gives the electrical and environmental conditions at which these parameters have been measured and also contains information on variation of important parameters as a function of other relevant electrical and environmental parameters. It is vital information particularly when you are designing a circuit or a module that has to qualify stringent environment standards. A comprehensive datasheet almost invariably includes application circuits recommended by the manufacturer.

Nokia RTTL Frequencies (Hz)

Here's the Ring Tone Transfer Language (RTTL) for Nokia mobile phone for Octave 4 to Octave 7. RTTTL is a simple text-based format that you can use to create ring tones.to play music, all you need to do is to get the RTTTL ring tone of the particular music, then read its note and generate the frequency for the calculated duration.

No.		Octave=4	Octave=5	Octave=6	Octave=7
1	A	220.000	440.000	880.000	1,760.000
2	A#	233.082	466.164	932.328	1,864.655
3	B	246.942	493.883	987.767	1,975.533
4	C	261.626	523.251	1,046.502	2,093.005
5	C#	277.183	554.365	1,108.731	2,217.461
6	D	293.665	587.330	1,174.659	2,349.318
7	D#	311.127	622.254	1,244.508	2,489.016
8	E	329.628	659.255	1,318.510	2,637.020
9	F	349.228	698.456	1,396.913	2,793.826
10	F#	369.994	739.989	1,479.978	2,959.955
11	G	391.995	783.991	1,567.982	3,135.963
12	G#	415.305	830.609	1,661.219	3,322.438

Flexible Circuits - Advantages and Applications

Flexible electronics is a technology for assembling electronic circuits by mounting electronic devices on flexible high performance plastic substrates, such as polyimide. This post is about flexible electronics circuits advantages of flexible boards, and its emerging applications.

Disadvantages Of HDTV

In the previous post, we discussed about HDTV and its advantages. But there are some issues - disadvantages with HDTV.

• To be able to receive HD content, you need to have an HD-ready TV set or TV set with built-in HDTV tuner, which is comparatively expensive. Also, traditional SD programmes originally filmed in the standard 4:3 ratio, when seen on an HDTV monitor, will have empty margins to the left and right of the image because 16:9 wide-screen aspect ratio is the standard for digital HDTV. You can choose to fill this unused display area by stretching the SD shows horizontally to fill the screen, but this will only distort the image.

• Normally, the HDTV transmission is provided through satellite and the same may not be available on free basis. In such a case, you may be required to subscribe to HDTV with the service provider.

• HDMI, or component video cables, must be used to support high-definition signals. HDMI is an all-digital connection that allows both HD audio and video to pass through a single cable. If you use older video cabling standards like com-posite or S-Video for connections from a cable box or satellite dish, you will get only an SDTV-quality picture.

• Another drawback of HDTV is that most of the operators do not fully follow HDTV specifications. So the HD picture quality is usually not as good as promised. Operators tend to use slower bitrates or lower resolution to accommodate more channels within the limited bandwidth, which reduces the video quality.

• While on an analogue TV, the interference causes the picture to slowly deteriorate from bad to worse,
  interference in HDTV broadcast will freeze, skip, or display ‘garbage’ information.

What all is required for HDTV reception?

You may ask “Do I need a special TV to be able to see HDTV?” The answer is that only high-definition televisions can display HD content in the HD resolution. Enhanced-definition televisions can display HD content in a 480p resolution, which is DVD quality. All other televisions that are analogue of standard digital will not be able to display HD content in an HD resolution because they lack the technology to do so.

Sources of HDTV Signals

Therefore HDTV has the highest level resolution offered within the digital TV category. We can also infer that HD is digital, but not all digital TV is HD. HDTV has a 16:9 aspect ratio, which is the same as that of a movie
theater screen. This post describes the sources of High defenition TV signals. 

Working of Touch Screen Mobiles

• What is the working principle behind touchscreen mobiles?
• How do they differ from ordinary mobiles?
• What are their drawbacks?

This post is intended to answer these kind of questions that usually arises in user minds.Mobile phones may use two types of input devices. In regular mobile phones, a keypad type of device is used, which is mounted separately from the screen of the cellphone. Whereas in touchscreen cellphones, a touch screen is a cellphone display screen that also acts as an input device. The touchscreens are sensitive to pressure; a user interacts with the mobile applications by touching pictures or words on the screen.