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amr mohamed

Occupation: : 369
Date of Birth : 1994-09-29
Join Date : 2010-11-12
Age : 23

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


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