5 Zone Alarm System

Description :

 This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC's and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a "system armed" indicator. The schematic is as follows :

                        Click on the Image to Zoom it.

Gate Alarm

Description :

 A cheap and simple gate alarm made from a single CMOS Integrated Circuit.

Circuit NoteS

      Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply.

USB Powered Mobile Phone Battery Charger

Now you can charge your Mobile Phone from the USB outlet of PC / Laptop

          This simple circuit can give regulated 4.7 volts for charging a mobile phone. USB outlet can give 5 volts DC at 100mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone batteries are rated 3.6 volts at 1000 to 1300 mAh. These battery packs have 3 NiMh or Lithium cells having 1.2 volt rating. Usually the battery pack requires 4.5 volts at 300-500 mA current for fast charging.

Why This Kolaveri Di

"Why This Kolaveri Di" [DOWNLOAD]

Song by Anirudh Ravichander & Dhanush from the album "3 : Music From The Motion Picture"

Released	16th November 2011
Format	Digital download
Recorded	2011 at AM Studios
Genre	Filmi
Length	4:08
Label	Sony Music
Writer	Dhanush
Producer	Anirudh Ravichander

FM Stereo Transmitter [BA1404 (100m)]

This is a small stereo FM transmitter. Output can be tuned from 88to 108Mhz and the transmitter can be battery powered or be used with the low voltage power supply on this page.

Notes :

This circuit is based on the Rhom BA1404 datasheet. The maximum voltage should not exceed 3V. The IC can be driven from a 7805 Regulator with a couple of 1N4001 diodes to reduce the supply voltage to about 2.8 Volts. The IC can dissipate 500mW (this is not RF power output but power dissipated by the IC). RF output power is typically 500mW but range depends upon antenna coupling and efficiency, environment and size of antenna. A small telescopic whip has an expected range of at least 100 meters or more.

150W MP3 Car Amplifier with Advance Fucation

        It is a diagramm of an active loudspeaker. The LF353 of, National Semiconductor, is going to split audio signal into three bands. SANYO'S LA47536 is going to amplify these signals. In stereo mode, we shall have the action of eight high speakers who are going to create a very important sound pressure.

Block Diagram : 

THEORY ::: RC-coupled Amplifiers

          One way to connect various stages of a multistage amplifier is via capacitors, as indicated in the two-stage amplifier in Fig.1 where two stages of common emitter amplifiers are coupled to each other by the capacitor C₃.

                                                   A typical configuration of an RC-coupled amplifier

Free Internet Browsing & Downloading via Airtel !!!

  
  
    Browsing internet from mobile is a common thing nowdays, But It cost is still unpayable for some peoples. Specially for Students, So Today I am here with my New trick which provide you Free Internet Surfing Through your Mobile phone.

PCB Etching at Home

     Today, I am gonna show you something etching process through which I made a PCB (RC coupled amplifier) Because of Practical in My collage. So, etching a PCB at Home is Very Simple, Just you Make out Right Composition of "Ferrous Chloride" with Water.

     I will show you How you Can make out a PCB through Some Sreen Shoot. Below is the List of Material Required for Etching Purpose.

1. A permanent marker
2. Ferrous Chloride
3. Normal water (50 degree Celsius)
4. Copper Clad Sheet
5. Cutter

How Data is stored on Hard Disk

            Hard disk is a common data storage used in computers. Data is stored on the hard disk in the form of 0 and 1. Through this article we will find out how actually data is stored on the hard disk drive.  The part of the hard disk that stores the data is known as platter. Platters are circular disk made of a non magnetic material typically aluminum alloy, glass or ceramic and are coated with a thin layer (10-20nm) of a magnetic material. Platters are further separated in to the tracks and sectors where tracks are concentric circles while sectors are pie shaped wedges on the track.

       Hard disk stores information in the form of magnetic fields. Data is stored digitally in the form of tiny magnetized regions on the platter where each region represents a bit. To write a data on the hard disk, a magnetic field is placed on the tiny field in one of these two polarities: N-S – If North Pole arrives before the south pole and S-N – if the south pole arrives before the north pole while the field is accessed.  An orientation in the one direction (like N-S) can represent the ‘1’ while the opposite orientation (S-N) represents “0”. This polarity is sensed by integrated controllers built within the hard disk.