LTspice circuit simulation tutorials for beginners

LTSpice Circuit Simulation Tutorials for Beginners

“What is the best free circuit simulation software?” The answer is here. As a solid user of this circuit simulation software, I introduce this to you; LTSpice. “How to Use LTSpice?” “How to Start Simulation in LTSpice?” So many questions in mind, we will answer all these. In this article I will teach LTspice circuit simulation tutorials for beginners. Advanced

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Operation of a Switch Mode Power Supply

How a Switch Mode Power Supply Works? What is the operation of a switch mode power supply? A switch mode power supply works by continuously switching on and off a semiconductor switch. This semiconductor switch is can be a MOSFET or a BJT. The former is more popular than the latter. When the switch turns off, there is no current

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How to Drive a Transistor into Hard Saturation

How to drive a transistor into hard saturation? In using a transistor to operate as a switch you must drive it into saturation. Saturation happens when the collector current cannot further increase despite there is base current increase. The saturation level of every transistor varies. The usual range is from 0.7V to ideally zero. For instance for a BC817-25 transistor,

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How Optocoupler Works

What is an Optocoupler? How Optocoupler works? These are just some of the questions I have before knowing this device. Opto coupler or opto isolator or photo coupler is an electronic device (a semiconductor) which is commonly used for signal isolation such as the primary and the secondary of a switching power supply. Its input circuit is a light source which is commonly a light

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BJT Operation Modes

BJT operation modes are at cut-off, saturation and active or linear. At cut-off, simply the BJT is not operating, say the base-emitter voltage requirement is not meet. The corresponding collector-emitter voltage is the same with the collector supply. At saturation the other hand, the BJT is driven into the point wherein its collector current can no longer increase despite of the increase

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