intercom

Slide 1

WELCOME6/2/20151TRANSISTOR INTERCOM6/2/20152By: Pallavi K R 17152CONTENTS:Introduction to intercomBasic terms - Wired intercom - Wireless intercomTypes of intercomBasic DescriptionBasic ingredients of intercom Circuit Description Working6/2/20153

KIRCHHOFFS LAWS

6/2/20154Kirchhoff's circuit lawsare that which deal with theCurrentandVoltage in anElectric circuit they are also calledKirchhoff's rulesor simplyKirchhoff's laws. They were first described in 1845 by German physicist Gustav Kirchhoff. There two laws are;Kirchoffs Current Law (KCL)Kirchoffs Voltage Law (KVL)

INTERCOMAn intercom is an electronic communications system within a building or group of buildings.Examples:Walkie talkieTelephonesCell phones Electro-mechanical or electronic devices such as signal lights and door latches.

6/2/20155

5BASIC TERMS:6/2/20156 Master Station or Base Station - These are units that can control the system, i.e., initiate a call with any of the stations and make announcements over the whole system.

Sub-station - Units that are capable of only initiating a call with a Master Station but not capable of initiating calls with any other stations(sometimes called slave units).

Intercom Station - Full-featured remote unit that is capable of initiating and receiving conversation, individual conversation and signaling .

Wall Mount Station - Fixed-position intercom station with built-in loudspeaker. Belt Pack - Portable intercom station worn on the belt. Requires a headset or handset.

6Wired Intercoms6/2/20157

7Wireless intercom6/2/201585v2v

Communicate over airwaves

Efficient

Easily maintained

Portable8TYPES OF INTERCOM6/2/20159 Intercom systems are mainly of two types :Master- Slave or Principal- Subsidiary system

Independent station system.

9BASIC INGREDIENTS OF AN INTERCOM SET:6/2/201510 A Mic

A loudspeaker

An amplifier

A listen talk switch

Push button switches

Matching device

Conference facility

10CIRCUIT DIAGRAM6/2/201511

APPLICATIONS:6/2/201512 Offices Hospitals

BanksBILL OF MATERIALS WITH COST ESTIMATION6/2/201513Components RANGE qty price (Rs.)

Resistance 180k 8 8 10k 8 8 100k 8 8 1k 8 8Ceramic capacitor 0.1 F 6 6 10 F 4 15 100 F 2 15NPN transistor 3 28Speaker 8 2 40Switch (DPDT) 2 20 163 RupeesTHANK YOU6/2/201514