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In Reply to: RE: DIY vs. Commercial you can do better. posted by drlowmu on January 24, 2017 at 14:43:27
DIY audio is a leisure activity into itself. The idea that it's possible to make something in your garage which will compete viably with a highly praised $10k commercial product is of course complete insanity, unless there's a genius at work.But it's certainly possible to build something which will compete performance wise with gear in lower price categories.
I liken it to people who build cars in their garage. No person in his right mind believes that his home made car is going to be objectively better than a commercial product.. I think that just isn't the point.
It's an outlet to express creativity and enjoy solving some puzzles. And there's a feeling of accomplishment when the end product is satisfying. I strongly suspect that many people in the DIY community enjoy thinking about amplifiers and working on them as much as they enjoy using them... and what's wrong with that?
How to mitigate hum? In my experience, the nastiest, worst, sneakiest thing in an amplifier is the connection between the power transformer and the negative side of the first filter capacitor. If this isn't a direct connection, even a milliohm will introduce hum into the amplifier. And if the capacitor is over sized off a solid state rectifier, it won't be hum, it will be buzz.
Edits: 01/24/17Follow Ups:
Good observation! You want your grounds short, and made from VERY heavy current conductors.
-Dennis-
I have achieved decent results paralleling specific circuit board traces on a couple commercial amps which were not that well designed with bare #14 from Romex - not the stuff of high end, sure, but it made a noticible reduction in background noise.
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