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amr mohamed
 
 


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Occupation: : 369
Date of Birth : 1994-09-29
Join Date : 2010-11-12
Age : 22

PostSubject: Telephone Hold Button   Sun 03 Apr 2011, 9:11 am


Telephone Hold Button

Description of Service

Speaker phone bell .. Or add
Indicator light when ringing



Circuit diagram



Electronic items

Resistance of 10 kilo ohms
Resistance
47 Kilo Ohm 2
Resistance
10 Ohm
Capacitor 0.22
Mkrofrad number 3
Capacitor
20 Mkrofrad
Transistor 2N3904 2 1N4148 diode 2
Bell or
12-volt lamp


cheers

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