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amr mohamed
 
 


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Date of Birth : 1994-09-29
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Age : 22

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


Telephone Hold Button


Description of Service

Key telephone calls for comment


Circuit diagram



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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