DTMF (Dual-tone multi-frequency )

Dual-tone multi-frequency (DTMF) signaling is used for telephone signaling over the line in the voice-frequency band between telephone handsets and the call switching center. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch-Tone, and is standardized by ITU-T Recommendation Q.23. There are twelve DTMF signals,...

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K-MAP MINIMISING SOFTWAREStarting Electronics Construction Techniques(from electronics every day)ELECTRONICS CONCEPTS FIRST EDITION E BOOKUNDERSTANDING ELECTRONICS COMPONENTSThe Complete Idiot's Guide to Electrical Repair EBOOKTEACH YOUR SELF ELECTRICITY AND ELECTRONICSRADIO FREQUENCY CALCULATOR (RF SIMULATOR)Lessons in Electric circuits Volume I - DCINDUCTOR CALCULATORELECTRONICS CALCULATING SOFTWAREFREE PCB DESIGN SOFTWARERESISTANCE COLOR CODE GENERATOR MISCELLANEOUS ELECTRONICS SOFTWAREELECTRONICS FOR U(EFY) MAGAZINE MARCH 2009Elektor magazine...

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DIODES

In real how a diode looks likeits a two terminal deviceThe circuit symbol for diode isthere are different types of diode....DiodeZenerdiodeEvery diode leaks (allows a little amount of current to pass through) in the wrong direction, but when there is more then about 60 volts on the diode (in the blocking direction) it will let it all pass, and it often...

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SWITCHES

Function of a SwitchA switch is circuit element that allows or prevents the flow of electricity through a circuit, there are many types of switches they are as follows.Single pole single throw switchCircuit symbolThis is the most widely used switch, it can be either closed or open.Single pole double throw switchThis is an electromagnetic switch also...

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BREAD BOARD

A bread board is also known as a project board, It has got itself a place in every electronics hobbyist because of its "User Friendly" Nature, a bread board needs no soldering and already it is connected internally, lets see about it in detail.This is how a bread board looksA bread board is available in many shapes and sizes and has a facility to connect...

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LIGHT DEPENDENT RESISTORS(LDR)

A Light Dependent Resistor (aka LDR, photoconductor, or photocell) is a device which has a resistance which varies according to the amount of light falling on its surface. Symbol for LDRLight sensor circuitOpposite is a simple light/ dark sensor. This can be connected as an input or switch to another circuit. The sensors has three green wires (1, 2...

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