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SPY AMPLIFIER This simple circuit will detect very faint sounds and deliver them to a 32 ohm earpiece. The circuit is designed for 1.5v operation اسمحوا لي بالمشاركة معكم بهذه الدائرة عالية الحساسية و من مميزاتها أنها تعمل على 1.5 فولت وللأداء الأمثل يستعمل هيدفون بممانعة 32 أوم تقريبا  
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و ربما تكون الدوائر التالية مفيدة  PHONE TAPE - 2 The circuit is turned off when the phone line is 45v as the voltage divider made up of the 470k, 1M and 100k puts 3.5v on the base of the first BC557 transistor. If you are not able to get to cut the lead to the phone, the circuit above will record a conversation from an extension lead. The remote plug must be wired around the correct way for the motor to operate.   PHONE ALERT Two circuits are available to show when a phone is being used. The first circuit must be placed between the socket on the wall and the phone - such as cutting into the lead and insert the bridge and diode. But if you cannot cut the lead to the phone, you will have to add an extension cord and place the second circuit at the end of the line. You can also connect a phone at the end if needed.  THE LISTENER This circuit consists of a 4-transistor amplifier and a 3-transistor "switch" that detects when the phone line is in use, and turns on the amplifier. The voltage divider at the front end produces about 11v on the base of the first BC557 and this keeps the transistor off. Switch the unit off when removed from the phone line.    PHONE TRANSMITTER - 1The circuit will transmit a phone conversation to an FM radio on the 88-108MHz band. It uses energy from the phone line to transmit about 100metres. It uses the phone wire as the antenna and is activated when the phone is picked up. The components are mounted on a small PC board and the lower photo clearly shows the track-work.  PHONE TRANSMITTER - 2 The circuit will transmit a phone conversation to an FM radio on the 88-108MHz band. It uses energy from the phone line to transmit about 200metres. It uses the phone wire as the antenna and is activated when the phone is picked up.
التعديل الأخير تم بواسطة : ahmedfarghaly بتاريخ 29-11-2008 الساعة 11:18 AM |
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تفضل أخى هذا الكتاب فى مجال الإتصالات الرقمية أتمنى أن يكون مفيدا , والله ولى التوفيق .
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تكملة مخططات جهاز التنصت الليزري
بسم الله الرحمن الرحيم
 أصدقائي و أخواني الأعزاء سنكمل مخططات جهاز التنصت الليزري       |
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مساعدة
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!!!!!!!!!!
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