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| هندسة الالكترونيات ................ بإشراف : م.الـحـربي |
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LinkBack | أدوات الموضوع |
التقييم: 
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06-04-2007, 04:33 AM
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Remote Doorbell Warning Switch
 
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06-04-2007, 04:34 AM
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Electronic Night Light
2N3904, BC109CElectronic Night Light  التعديل الأخير تم بواسطة alsaneyousef ; 06-04-2007 الساعة 04:37 AM.
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06-04-2007, 04:39 AM
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A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps.
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06-04-2007, 04:41 AM
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timer circuit with independent mark and space periods.
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06-04-2007, 04:42 AM
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simple thermistor triggered cold switch with adjustable threshold.
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06-04-2007, 04:46 AM
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This simple circuit is sure to have the police beating a path to your door - however, it has the added advantage of alerting you to their presence even before their footsteps fall on the doormat.
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06-04-2007, 04:48 AM
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A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector.
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06-04-2007, 04:50 AM
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from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.
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06-04-2007, 04:53 AM
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This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.
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06-04-2007, 04:55 AM
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below:
 Pin 1 is the clock input Pin 2 is the clock enable Pin 3 is display enable Pin 4 enables the carry output Pin 5 is the carry output Pin 6 is display segment f Pin 7 is display segment g Pin 8 is 0 V. Pin 9 is display segment d Pin 10 is display segment a Pin 11 is display segment e Pin 12 is display segment b Pin 13 is display segment c Pin 14 is the2 output Pin 15 is reset Pin 16 is +Vcc
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06-04-2007, 04:57 AM
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A single chip metal detecor with a range of a few inches. This is useful for decting nails or screws in walls and floors, or for locating buried mains cable.
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06-04-2007, 05:00 AM
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Electromagnetic Field Detector This circuit is sensitive to low frequency electromagnetic radiation and will detect for example hidden wiring or the field that encompasses a transformer. Pickup is by a radial type inductor, used as a probe which responds well to low frequency changing magnetic and electric fields. Ordinary headphones are used to for detection. The field that surrounds a transformer is heard as a 50 or 60Hz buzz. The circuit is below:- 
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06-04-2007, 05:02 AM
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switch.
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06-04-2007, 05:05 AM
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com
 Neon Desklamp
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06-04-2007, 05:08 AM
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Static Electricity / Negative Ion Description: 
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| مواقع النشر (المفضلة) |
| أدوات الموضوع | |
| تقييم هذا الموضوع | |
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