![]() One important thing about EMC: you will never stop learning, and finding new problems to solve. It will hopefully also serve as a useful reference for anyone wanting to know a bit more about EMC as applied to amplifiers. This presentation ( which will remain a work in progress and be expanded from time to time) is designed to get audio constructors up and running quickly both in the construction/planning phase, but also debugging. When it comes to humming and hissing amplifiers, good practical advice is scarce, though often misguided opinions on the subject seem easy to find. This set of slides focuses on unbalanced interconnects (aka ‘single-ended’) that use the standard RCA phono connectors, since this is where problems mostly arise. The underlying theory can be extremely complex, however, with some effort and focus you can quickly master the basics. The path from electromagnetic theory expounded on numerous websites, application notes and posts on various web forums to building quiet amplifiers every time is not easy and requires a bit of practice. I then left DIY audio for about 15 years (career, family etc), returning to the subject again about 15 years ago, having forgotten a lot of my practical skills. Later, my skills improved dramatically, and especially so after reading one of Henry Ott’s books back in about 1988/89 whilst developing a very high resolution Digital Panel Indicator for industrial applications at the company I worked for. Some of my creations were reasonably quiet – through pure luck – and others hummed and hissed horribly. I first started out in audio around 1975 or 76 a teenager. 50 slides is the culmination of my experience over a period of about 25 years building numerous power amplifiers and preamplifiers. Updated with new material 7th January 2019
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