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Department projects and electronic circuits

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Telephone circuits

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Telephone recorder

 		0amr mohamed1031Sun 03 Apr 2011, 8:17 am
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Service to prevent eavesdropping

 		0amr mohamed697Sun 03 Apr 2011, 8:24 am
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Ring to light telephone circuit

 		0amr mohamed1557Sun 03 Apr 2011, 8:25 am
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two telephone set on one line

 		0amr mohamed896Sun 03 Apr 2011, 8:30 am
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Telephone line status

 		0amr mohamed792Sun 03 Apr 2011, 8:32 am
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Telephone line monitor

 		0amr mohamed839Sun 03 Apr 2011, 8:47 am
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Telephone ring amplifier

 		0amr mohamed1513Sun 03 Apr 2011, 8:53 am
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Telephone Hold Button

 		0amr mohamed738Sun 03 Apr 2011, 9:11 am
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Telephone Hold Button

 		0amr mohamed1022Sun 03 Apr 2011, 9:17 am
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A simple circuit to filter the phone line interference from the DSL

 		0amr mohamed2181Sun 03 Apr 2011, 9:29 am
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Department of lighting the bulb of the phone line

 		0amr mohamed675Sun 03 Apr 2011, 10:16 am
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contactless telephone ringer

 		0amr mohamed1194Sun 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 mohamed1143Sun 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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