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Optocouplers, Part 2: Parameters and applications

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Part 1 of this FAQ explored the basics of the optocoupler. This part looks at key parameters and some application examples. Q: What are the primary factors used when assessing an optocoupler? A: While there are many important factors, there are several which are noteworthy: isolation, current-transfer ratio (CTR), linearity (for analog use), and speed. […]

Optocouplers, Part 1: Principles and usefulness

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The optocoupler — also called an optoisolator — is among the most useful, versatile, problem-solving components available to the design engineer. This small non-monolithic device does one thing and does it well, with minimal complications in most cases and no software. This FAQ will look at its operation principles, key parameters, and applications of this […]

Getting started in electronics: core components

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By “Spec“, Electro-Tech-Online forum member Often newbies ask, ‘How can I get started in electronics?‘ This is a big question, but the very short answer is, ‘Learn the two fundamental electronics laws (Kirchoff, Ohm), get a good book about electronics theory and practical, build some circuits, and make some measurements.’ Follow-on questions are, ‘What electronic […]

Distortion tolerant (mostly): isolated digital interfaces

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Following on from previous discussions on the problems of analog signal integrity and isolation, I came across the Linear Technology LTM2886 for isolation of SPI or I2C interfaces. This is one of a range of isolated transceivers from Linear Technology covering RS422, RS485, RS232, SPI, I2C and USB. A clear advantage of digital rather than […]