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DESIGN AND IMPLEMENTATION OF OP-AMP-RC SINE WAVE OSCILLATOR
تصميم وتنفيذ مذبذب الموجه الجيبية

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Abstract

The oscillator is a form of frequency generators which can be generate a sinusoidal wave with constant frequency and amplitude. The frequency oscillator can be considered as a one of basic circuits, which must be existing in most electrical, electronic, communication circuits and systems.In this paper, a proposed design of sine wave oscillator type RC phase shift has been performed using three approaches. The first approach proposed design is done theoretically using the basic theorems used to generate oscillations, such as the condition of oscillation criteria. Secondly it is done using simulation technique (multisim11). Thirdly the simulated design is implemented practically using single operational amplifier with passive elements such as resistors & capacitors. All the obtained results from the above three approaches (3.800 kHz, 3.510 kHz & 3.600 kHz respectively) are seems to be equal approximately. These obtained results from the designed oscillator were very encouraging.

المذبذب هواحد انواع مولدات التردد التي يمكن ان تولد موجه جيبية ذات تردد ثابت وسعه ثابته.مولد التردد يمكن ان يعتبراحد الدوائر الاساسية التي يجب ان توجد في اغلب دوائر وانظمة الكهرباء, الالكترونيك والاتصالات.في هذا البحث التصميم المقترح لمولد الموجه الجيبية نوع:- قد تم انجازه بثلاث اساليب: فرق طور مقاومة متسعةاولا: تم انجاز التصميم المقترح نظريا بأستخدام نظريات الالكترونيك الاساسية مثل شروط ومعايير التذبذبات (Multism 11)ثانيا: تم انجاز التصميم بأستخدام تقنية المحاكاة.ثالثا: التصميم المقترح المنجز بالمحاكاة قد تم تنفيذه عمليا بأستخدام مضخم عمليات مفرد مع العناصر غير الفعالة مثل المتسعات والمقاومات.جميع النتائج المستحصلة من الاساليب الثلاثه اعلاه (3.8KHZ,3.51KHZ,3.6KHZ) على التوالي والتي تبدو متساوية تقريبا. أن هذه النتائج المستحصله من التصميم المقترح كانت مشجعة جدا.

Keywords

RC --- OP-AMP --- Phase Shift Oscillator.


Article
Automated Power Factor Correction for Smart Home

Authors: Basil H.Jasim --- Bilal Naji Alhasnawi
Journal: Iraqi Journal for Electrical And Electronic Engineering المجلة العراقية للهندسة الكهربائية والالكترونية ISSN: 18145892 Year: 2018 Volume: 14 Issue: 1 Pages: 30-40
Publisher: Basrah University جامعة البصرة

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Abstract

In the current scenario, power factor has become an important concern in all industries. Poor power factorgives rise to many problems which result in financial loss of industries and also for the commercial users. The mainconcern of this work is to improve the usage of real power with respect to reactive power hence improving the powerfactor. Here we have used the technique of relay switching method with a capacitor so that any drop in power factorcan be sensed by the controller and switch the capacitor as required. This will not only help to improve power factorbut also demand of electricity supply on utility side will be reduced. The Significance of this work is to build anAPFC (Automatic Power Factor Correction) Unit. The APFC appliance calculates the reactive power (KVAR)expended by a system’s load and compensates the lagging PF (power factor) utilizing capacitances from capacitorbanks.

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