How to make telephone easy at home

learn how to make telephone easy at home using simple few steps with circuit diagram. basically its simple combination of speaker and mic. and transistor use for amplifier audio.

How to make telephone easy at home

in this project we learn how to make telephone easy at home using simple few steps with circuit diagram. basically its simple combination of speaker and mic. and transistor use for amplifier audio. 
for making this project we need some components.
How to make telephone easy at home
How to make telephone easy at home

Components:

  • 2n2222a Transistor (2)
  • Mic (2)
  • Speaker (2)
  • On/Off Button (2)
  • 10k Variable Resistor (2)
  • 9v Battery (2)
  • 9v Battery Clips
  • PCB Board (2)
  • Cable wire (2)
  • Clip Connector (2)
  • Soldering Wire
  • Soldering iron

Circuit diagram of telephone:
How to make telephone circuit diagram
How to make telephone circuit diagram

  • 2n2222a NPN Transistor has 3 pin. 1st emitter, 2nd base, and 3rd collector.
  • Connect negative side of speaker wire with collector pin.
  • 10k variable resistor has 3 pin. 
  • 1st pin connect with positive side of speaker wire.
  • Middle pin connect with base pin of transistor.
  • 3rd pin connect with mic. 
  • and 2nd side of mic connect with emitter pin of transistor.
  • Positive side of 9v battery connect with speaker positive pin.
  • and negative side of battery connect with transistor emitter pin.
  • finally connect on/off button between positive wire of battery.
follow same procedure and make 2 set.
phone set connection diagram
phone set connection diagram
  • now 1st phone speaker connect with 2nd phone using wire.
  • and 2nd phone speaker connect with 1st phone using wire.  
we can better understand with this picture.
in this picture we make 2 phone set.
and replace speaker connection with clip connector. 
now connect 1st speaker with one side of wire. and 2nd side of wire connect with 2nd phone set using clip connector.
similarly 2nd speaker connect with one side of wire and 2nd side of wire connect with 1st phone using clip connector.
we learn it more better with watching video.

Video of how to make telephone set:



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