Build Your Own Professional-Grade Audio Amp on the Sort-Of Cheap

Photo: Randi Klett
Years ago I decided to see how little I needed to spend to build a high-end, audiophile quality, class-D amplifier. The answer, then, was US $523.43. I built a worthy little amp, and the article I wrote about it for IEEE Spectrum still attracts page views, and even sporadic emails from people asking where they can get the parts.
Sorry folks, the main components are long gone. So I’ve been steering people to excellent class-D amplifier kits from Class D Audio, DIY Class D, and Ghent Audio instead. But a couple of months ago I got the itch to see how much better I could do now, almost a decade later, with the same challenge. Part of my motivation was the annual Best Stereo Amps lists from gadget-review website The Master Switch. The lists are dominated by amps costing more than $1,000 (nine of them cost


Original URL: http://feedproxy.google.com/~r/feedsapi/BwPx/~3/2AqSCVfj960/build-your-own-professionalgrade-audio-amp-on-the-sort-of-cheap

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Explore, Transcribe and Tag at Crowd.loc.gov!

This is a guest post by Lauren Algee, senior innovation specialist with the Library’s Digital Innovation Lab.
What yet-unwritten stories lie within the pages of Clara Barton’s diaries, the writings of civil rights pioneer Mary Church Terrell or letters written by constituents, friends and colleagues to Abraham Lincoln? With the launch of crowd.loc.gov, the Library of Congress is harnessing the power of the public to make these and many other collection items accessible to everyone.
Crowd.loc.gov invites the public to volunteer to transcribe (type) and tag with keywords digitized images of text materials from the Library’s collections. Volunteers will journey through history first-hand and help the Library while gaining new skills – like learning how to analyze primary sources or read cursive.
Finalized transcripts will be made available on the Library’s website, improving access to handwritten and typed documents that computers cannot accurately translate without human intervention. The enhanced access will occur


Original URL: https://blogs.loc.gov/loc/2018/10/explore-transcribe-and-tag-at-crowd-loc-gov/

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