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Department projects and electronic circuits

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Telephone circuits

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Telephone recorder

 		0amr mohamed1030Sun 03 Apr 2011, 8:17 am
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Service to prevent eavesdropping

 		0amr mohamed696Sun 03 Apr 2011, 8:24 am
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Ring to light telephone circuit

 		0amr mohamed1556Sun 03 Apr 2011, 8:25 am
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two telephone set on one line

 		0amr mohamed895Sun 03 Apr 2011, 8:30 am
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Telephone line status

 		0amr mohamed790Sun 03 Apr 2011, 8:32 am
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Telephone line monitor

 		0amr mohamed838Sun 03 Apr 2011, 8:47 am
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Telephone ring amplifier

 		0amr mohamed1512Sun 03 Apr 2011, 8:53 am
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Telephone Hold Button

 		0amr mohamed737Sun 03 Apr 2011, 9:11 am
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Telephone Hold Button

 		0amr mohamed1021Sun 03 Apr 2011, 9:17 am
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A simple circuit to filter the phone line interference from the DSL

 		0amr mohamed2180Sun 03 Apr 2011, 9:29 am
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Department of lighting the bulb of the phone line

 		0amr mohamed674Sun 03 Apr 2011, 10:16 am
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contactless telephone ringer

 		0amr mohamed1193Sun 03 Apr 2011, 10:19 am
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PHONE ALERT

 		0amr mohamed625Sun 03 Apr 2011, 10:23 am
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PHONE ALERT CIRCUIT

 		0amr mohamed1141Sun 03 Apr 2011, 10:25 am
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Department projects and electronic circuits
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Telephone circuits
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