About: Ibrar Ayyub

What is a Pager? A pager is a very simple radio that listens to just one station all of the time. A radio transmitter broadcasts signals over a specific frequency. All of the pagers for that particular network have a built-in receiver that is tuned to the same frequency broadcast from the transmitter. The pagers […]

On May 17, 1902, a Greek archeologist noticed precision gear wheels embedded in an ancient artifact of corroded bronze and wood. The device would come to be known as the Antikythera mechanism, the oldest known complex scientific instrument. Discovered in 1900 on the wreck of an ancient Roman merchant vessel near the island of Antikythera, […]

Cell Phone Jamming Basics Disrupting a cell phone is the same as jamming any other type of radio communication. A cell phone works by communicating with its service network through a cell tower or base station. Cell towers divide a city into small areas, or cells. As a cell-phone user drives down the street, the […]

To reach a maximum mechanical stability, many Sonitron piezo components are now available even with a foam tape. Sonitron piezo components feature a high reliability, resistance to harsh conditions and also to vibrations. Despite these features, usually one of the weakest points (as for the vibration-resistance) is the joint of leads with a PCB. That´s […]

Understanding the CD: Material As discussed in How Analog and Digital Recording Works, a CD can store up to 74 minutes of music, so the total amount of digital data that must be stored on a CD is: 44,100 samples/channel/second x 2 bytes/sample x 2 channels x 74 minutes x 60 seconds/minute = 783,216,000 bytes […]

This time, simple project that i made from simple need. Simple, cheap and functional regulated power supply 1,25V to 15V, two separately regulated positive lines and two negative. This power supply uses LM317 and LM337 integrated circuit stabilizers – or their stronger versions. Galvanically separated lines can be connected in various configurations. There is no […]

In consumer optical products — most commonly cameras — aperture describes the size of the hole that lets light into a device. Cameras use mechanical diaphragms to control how much light passes into the camera body and strikes the image sensor or film. That diaphragm works a lot like the irises in your eyes; it […]

I have been looking for a good stereo amplifier circuit diagram for a long time. I am not a HiFi geek, I just wanted to build a simple stereo amplifier that could drive some speakers for my desktop computer. All the schematic diagrams that I could find seemed to involve lots of hard-to-find components or […]

As with non-WiFi cameras, your choice of camera will be dependent on how you plan to use it. WiFi-enabled point-and-shoot cameras retail for a little bit more than their plug-and-play counterparts, from about $200 on up. As of early 2010, no WiFi SLR cameras were available; however, by using a WiFi-enabled SD card called an […]

Traditionally, switching DC/DC converters (voltage regulators) were controlled using analog techniques because these were simple to implement and helped to maximize the power supply’s efficiency. Digital components were too slow and power greedy to challenge analog dominance. However, over the past several years the introduction of high-speed, low power consumption and inexpensive silicon has rekindled […]