Popular Electronics Articles

Beam Circularizing and Astigmatism Correction Methods for Semiconductor Laser Diodes

Introduction The most commonly used method to circularize the elliptical beam is to use a pair of anamorphic correcting prisms, as shown in Fig.1. The prisms can enlarge or reduce the beam size in one direction while keeping the beam size in ...

0 Comments. 15971 views since Sep 22, 2007

Architecture of 8051 Microcontroller

Block Diagram of 8051 Microcontroller Block diagram of 89C51 Pin Diagram of 89C51 Microcontroller <i ...

1 Comments. 12814 views since Jul 5, 2008

Interfacing Devices to 8051

LED Interfacing Making a LED Blink The first step is to build a simple circuit. At this point you should be familiar with the parts used. This design is intended for use with an Atmel 89s51 but also possible for others family 8051.< ...

4 Comments. 4115 views since Jul 5, 2008

Junction Diodes

There were some historic crude, but useable semiconductor rectifiers before high purity materials were available. Ferdinand Braun invented a lead sulfide, PbS, based point contact rectifier in 1874. Cuprous oxide rectifiers were used as power rectifier ...

0 Comments. 3563 views since Sep 29, 2008

Near Field Communication Interface & Protocol-2 (NFCIP-2)

Near Field Communication Interface and Protocol-2 (NFCIP-2) Brief history In 2002, Ecma International formed Task Group 19 of Technical Committee 32 to specify Near Field Communication (NFC) signal interfaces and protocols. The NFC devi ...

0 Comments. 3414 views since Sep 10, 2008

2051 Microcontroller

 Microprocessor and Microcontroller Microcontroller was a by-product of the microprocessor development. The same fabrication techniques and programming concepts that make possible the general purpose microprocessor also yielded the micro ...

1 Comments. 2771 views since Jun 16, 2008

TETRA - Terrestrial Trunked Radio

TETRA - Terrestrial Trunked Radio for Professional Cellular System TETRA, the European standard for Trunked Radio Systems, is primarily intended for users in the public security sphere, transport, utilities and operators of public Trunked Radio ...

0 Comments. 2766 views since Sep 3, 2008

Water Level Indicator

Introduction It is simple water level indicator which indicates the level of water. That alerts you, if level of water is overflowed. Circuit Diagram <h ...

4 Comments. 2731 views since Sep 27, 2007

Basics of 8085

Three Logic Levels are used and they are High, Low, High impedance state. The high and low are normal logic levels & high impedance state is electrical open circuit conditions. Tri-state logic has a third line called enable line. ...

0 Comments. 2516 views since Aug 24, 2010

Echo Sounder : Ocean Depth Measurer

Abstract Maritime safety is of paramount concern to the scores of people who make a living from the sea. To ensure their safety and to provide safe navigation for ships, the most popularly used instrument worldwide is the Echo Sounder. The Ec ...

0 Comments. 2439 views since May 13, 2008