Today’s computer systems, with their emphasis on high resolution graphics, full motion video, high bandwidth networking, and so on, go far beyond the capabilities of the architecture that ushered in the age of the personal computer in 1982. Modern PC systems demand high performance interconnects that also allow devices to [...]
Chopper drive circuits
Chopper drive circuits are also referred to as constant current drives because they generate a somewhat constant current in each winding rather than applying a constant voltage. On each new step, a very high voltage is applied to the winding initially. This causes the current in the winding to rise quickly since dI/dt [...]
Short notes about Circuit troubleshooting.
- Check the circuit for mechanical failures, like disconnected wire, broken vias on the board, and connections between two adjacent vias which are not to be connected.
- You should compare values of components and their connections with values and connections between components on the schematic.
- Measuring DC voltages at certain points [...]
The Light Emitting Diode (LED), finds its place in many applications in this modern electronic fields. One of them is the Seven Segment Display. Seven-segment displays contains the arrangement of the LEDs in “Eight†(8) passion, and a Dot (.) with a common electrode, lead (Anode or Cathode). The purpose of arranging it in that [...]
Applications:
In monitoring & controlling of power systems such as Transformers, Generators, Motors etc.
To analyze the performance of electrical machines.
Can be used as a safety device to protect machines from over loading, excessive voltage etc.
To make the power distribution system efficient.
Recording device/Line parameters.
Introduction
This unit is used to protect heavy electrical machinery from damage caused [...]
GSM – AN OVERVIEW
GSM, Global System for Mobile communications, is today the most successful digital mobile telecommunication system. This second-generation (2G) system provides voice and limited data services and uses digital modulation with improved audio quality.
The different versions of GSM are:
GSM 900 band (850-915MHz up-link frequency and 935-960MHz downlink frequency)
GSM 1800 band or digital cellular [...]
GPS – AN OVERVIEW
The GPS (Global Positioning System) is a “constellation†of 24 well-spaced satellites that orbit the earth and make it possible for people with ground receivers to pinpoint their geographic location. The location accuracy is anywhere from 100 to 10 meters for most equipment. Accuracy can be pinpointed to within 1 meter with [...]
The RF section consists of an RF transmitter and an RF receiver. The RF transmitter mainly consists of a remote key that contains a code hopping encoder, HCS301 along with 2 buttons and two LEDs. The RF receiver section consists of a Low Power ASK receiver IC. The key encoder will generate the company specific [...]
The term PIC, or Peripheral Interface Controller, has been coined by Microchip technology to identify its single chip microcontrollers. PIC microcontrollers possess an array of features that make them attractive for a wide range of applications. Furthermore these microcontrollers are available with a range of capabilities, packaged in both dual-in-line(DIP) packages and surface-mount packages. Factors [...]
To run any php file you need to install Apache web server on your localhost. Also you need to install MySQL server for any database programming. You can install these seperatly or there is easy way to achive the same by installing XAMPP.
XAMPP is an easy to install Apache distribution containing MySQL, PHP and Perl. [...]
