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 Circuit / Schematic diagram of  Description
   
Microcontroller based intercom 8 Line intercom using ATMEL AT89c51 microcontroller
Full-duplex Intercom Two intercom system without an operator
Door Phone Intercom  
Head set Intercom  
High Quality Intercom  
Intercom Link includes schematic only
Telephone based Intercom-1 Simple circuit which converts your old phone to intercom system
Telephone based Intercom-2  
InterCommunication  
Transistorized Intercom Transistor based and 3-stage resistor-capacitor coupled amplifier
   
   
     
 
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