Active Filter part 1

Post kali ni saja nk citer pasal tajuk kat atas. rasa da kena kot ngan amatur nih.. hihi


Introduction

Filters are circuits that are capable of passing signals within a band of frequencies while rejecting or blocking signals of frequencies outside this band. This property of filters is also called “frequency selectivity”.

Filter can be passive or active filter.

Passive filters: The circuits built using RC, RL, or RLC circuits.

Active filters : The circuits that employ one or more op-amps in the design an addition to resistors and capacitors

Advantages of Active Filters over Passive Filters

-Active filters can be designed to provide required gain, and hence no attenuation as in the case of passive filters
-No loading problem, because of high input resistance and low output resistance of op-amp.
-Active Filters are cost effective as a wide variety of economical op-amps are available.

Applications

-Active filters are mainly used in communication and signal processing circuits.
-They are also employed in a wide range of applications such as entertainment, medical electronics, etc.

Active Filters

There are 4 basic categories of active filters:
1. Low-pass filters
2. High-pass filters
3. Band-pass filters
4. Band-reject filters

Each of these filters can be built by using op-amp as the active element combined with RC, RL or RLC circuit as the passive elements.

Rasa cukup kot sampai kt sini.. nnti kita sambung lagi.... k.
entry akan datang akan bercerita tentang 4 basic categories of active filter..

Lego FT8900R dan Handy GP338

Assalamulaikum rakan2 sekalin..

Ada sorang rakan hams nk lego radio iaitu

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DUA BARANG SEKALI
RM1500

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Sapa cepat dia dapat.. okey...

73

Upgrade boyfriend 5.0 to husband 1.0 - pentium8 version

Dear IT Support,

Last year I upgraded from Boyfriend 5.0 to Husband 1.0 and noticed a slow down in the
overall performance, particularly in the flower and jewellery applications that had operated flawlessly under Boyfriend 5.0.

In addition, Husband 1.0 un-installed many other valuable programs, such as Romance 9.5 and Personal Attention 6.5, but installed undesirable programs such as EPL 5.0, NBA 3.0 and ESPN 2.0. And now Conversation 8.0 no longer runs and House Cleaning 2.6 simply crashes the system. I've tried running Nagging 5.3 to fix these
problems, but to no avail.

What can I do?


Signed,
Desperate

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Reply:

Dear Desperate,

First keep in mind; Boyfriend 5.0 is an entertainment package, while Husband 1.0 is an
operating system. Try entering the command C:\ I THOUGHT YOU LOVED ME and download Tears 6.2 to install Guilt 3.0.

If all works as designed, Husband 1.0 should then automatically run the applications Jewellery 2.0 and Flowers 3.5.

But remember, overuse can cause Husband 1.0 to default to Grumpy Silence 2.5, Happy Hour 7.0 or Late Night Teh Tarik 6.1. Late Night 6.1 is a very bad program that will create SnoringLoudly.wav files.

Whatever you do, DO NOT install Mother-in-Law 1.0 or reinstall another Boyfriend program. These are not supported applications and will crash Husband 1.0.

In summary, Husband 1.0 is a great program, but it does have a limited memory and cannot learn new applications quickly. You might consider additional software to improve memory and performance. I personally recommend Hot Food 3.0 and Lingerie 6.9.


Good Luck,
IT Support