Rangkaian intercome

Intercome circuit can be used as a communication tool with a considerable distance,this circuit using a wave flowing through the wire.so that the longer the wire is used the more distant the distance the other person.

Components used :

• Tr1: Transistor PNP type AF 116
• Tr2: Transistor PNP type OC 126
• Tr3: Transistor PNP type OC 126
• R1 :  Resistor 4K7ohm
  
• R2 :  Resistor 270 ohm
  
• R3 :  Resistor 1K5 ohm
• R4 :  Resistor 150 ohm
• R5 :  Resistor 680 ohm
• R6 :  Resistor 330 ohm
• R7 :  Resistor 27K ohm
• R8 :  Resistor 10K ohm
• C1 :  Ceramic Condenser 4700pF
  
• C2 :  elektrolit condenser 100 uF
  
• C3 :  Elco 100 uF
  
• C4 :  Elco 0,1 uF
• C5 :  Elco 10 uF
• C6 :  Elco 32 uF
• C7 :  Elco 0,1 uF
• Sp :  Switch
  
• S   :  Switch on/off
  
• Ls :  Loudspeaker
  
• M  :  Microphone
  
• K  :  Wire
  
• B  :  Voltage 6 Volt

 How to use it is to press the switch on / off, then pressing the SP (switch the conversation).when pressing the switch SP all the components that connect the microphone to work, while the components connected to the speakers not working 
When finished talking, the switch SP is returned its original position.