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amr mohamed
 
 
amr mohamed


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Age : 30

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PostSubject: Telephone Hold Button    Telephone Hold Button I_icon_minitimeSun 03 Apr 2011, 9:17 am

Telephone Hold Button


Description of Service

Key telephone calls for comment


Circuit diagram

Telephone Hold Button Teleph10

Explain the circuit

When you press the Hold key comment
Closes on thyristor
Through the resistance R1 and R2 .. And
If current flows when the thyristor through resistance R3


cheers

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