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Showing posts from March, 2014

Fundamentals of Signal and Power Isolation

Thank to: http://techonline.com/electrical-engineers/education-training/courses/4418820/Fundamentals-of-Signal-and-PowerIsolationcid=nl_embedded&elq=328493bbb3bb4fd2be98d3abac93d0c0&elqCampaignId=16080 Introduction "Isolation" in circuits and systems means that there is no galvanic (ohmic) path between an input and an output. Most engineers are familiar with isolation of AC power lines using a transformer, which is standard practice in many line-powered designs and AC adapters/chargers. But isolation is often also needed for signals and subcircuits, so a signal's information can flow to another part of the system, but without a physical path. There are many reasons for need, including system and user protection; signal integrity; non-grounded and floating measurements, and ground separation. This Fundamentals course will briefly look at power isolation (often required in conjunction with signal isolation) and then focus on signal isolation techniques.

15 Bricks for your foundation

http://www.gocnhinalan.com/bai-tieng-anh/15-bricks-for-your-foundation.html 1. Count your blessings. Be grateful. Each day is a special gift from God. Mỗi ngày là một món quà đặc biệt của chúa Count upon: Hi vọng ở 2. Deliver more than you are getting paid to do. Go an extra mile on every task. Cho đi nhiều hơn. Tiến xa hơn trong mỗi nhiệm vụ. 3. Shake off your blunders and mistakes. Move forward. Never quit. Thoát khỏi các sai lầm đã qua. Tiến lên và không bao giờ từ bỏ. 4. Surround yourself with positive people, family and friends. Nurture their love and support. Sống trong môi trường của những người lạc quan, gia đình, bạn bè. Nuôi dưỡng tình yêu và sự giúp đỡ của họ. 5. Build today on a foundation of pleasant thoughts. Let the vision in your heart be your life’s blueprint. Xây dựng ngày hôm nay dựa trên nền tảng của những suy nghĩ thoải mái. Để những giấc mơ trong tim bạn trợ thành các bản kế hoạch chi tiết của cuộc đời. 6. Be on guard against the traps of false