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  1. DonH50

    R.I.P. Jim Winey

    Just heard today that Jim Winey passed away yesterday, January 11, 2024. Sad day... :(
  2. DonH50

    Helen Reddy and Mac Davis R.I.P.

    Apologies if already posted, but I just heard that both Helen Reddy and Mac Davis passed away September 29, 2020. R.I.P.
  3. DonH50

    Fire at vinyl production plant

    Bad news for vinyl lovers: https://pitchfork.com/news/devastating-manufacturing-plant-fire-threatens-worldwide-vinyl-record-supply/
  4. DonH50

    Class D Amplifiers 101

    <Split into several posts due to 10000-character limit per post> This is a quick overview of how class D amplifiers operate. Note the “D” does not mean “digital”; it is simply the next letter in order as standards bodies enumerated amplifier types (A, B, C, D, E, F, G, H, I, etc.) It takes an...
  5. DonH50

    MB Thread Comment

    Steve let me know folk were upset by my post about the possibility of HF rolloff and my comment about it being idle speculation. It was in no way my intent to take a jab at Steve nor anyone else and I am sorry I did not explain further. I was being a bit tongue-in-cheek in hopes it might add a...
  6. DonH50

    Stereo Processing/Width Processing Blog

    FYI. This comes up now and then, with pretty much the same conclusion -- artificially creating a stereo sense of "width" sounds, well, artificial! :)...
  7. DonH50

    Introduction to Comb Filter Effects

    Comb filter effects are a popular topic of discussion among audiophiles (and many others, of course). However, some audiophiles may not have a good concept of what they look like, why they may (or may not) be bad, and what they can do about them. Or even if they have them and need to do anything...
  8. DonH50

    Royer Microphone Article

    Here's a nice article about Rick Perrotta and David Royer and what they did to modernize the ribbon microphone: http://www.edn.com/design/analog/4441594/1/Finding-a-new-ribbon-microphone-angle
  9. DonH50

    McIntosh at Crutchfield

    Surprised to see this... http://www.crutchfield.com/S-Xf6jjj0GCfI/brands/McIntosh/?omnews=12886848
  10. DonH50

    New low-noise microphone (not audio-specific)

    Getting very low noise out of a microphone is hard as you might expect. My Earthworks M30 is rated to 20 dB SPL A-weighted. Not my area of expertise, but the times I have had a mic capable of sub-20 dBA SPL, it was expensive and required special power supply and preamp. This article/advert...
  11. DonH50

    Ground Loops 101

    This article is to help show what causes those pesky ground loops many of us have had to deal with at one time or another. Essentially what happens is that a signal is created between two ground points in the system. The gain from source to speaker can be very high and amplifies the “ground”...
  12. DonH50

    New AES Scholarship for Audio Students

    Any budding audio engineers might want to take a look at this new AES (Audio Engineering Society) scholarship in memory of Tom Kite, a well-known highly-respected AES leader and engineer/VP at Audio Precision...
  13. DonH50

    Technical Article on Capacitor Heating

    This is a good take on a well-known topic (capacitor heating) by an industry expert at Vishay. http://www.edn.com/design/analog/4439149/12/Aluminum-capacitor-slideshow--Handling-heat-issues It focuses on Al power capacitors but the principles apply to all capacitors. Inductors also exhibit...
  14. DonH50

    Clark Terry RIP

    Recently lost Wilmer Wise, and now Clark Terry: http://www.hollywoodreporter.com/news/jazz-musician-clark-terry-dies-776129 Heaven's getting some great players...
  15. DonH50

    Orion Launch -- Delayed

    Rats, initial launch stopped due to high winds, and now it looks like valve problems with the fuel system as the launch window slips away... http://www.nasa.gov/ -- or many other feeds. This is the next-generation capsule targeting Mars and solar system exploration. Launch vehicle is a Delta...
  16. DonH50

    New AP Analyzer

    http://edn.com/electronics-products/electronic-product-reviews/other/4434402/Audio-analyzer-claims-world-s-lowest-noise?_mc=NL_EDN_EDT_EDN_productsandtools_20140915&cid=NL_EDN_EDT_EDN_productsandtools_20140915&elq=50d9d1cd472b437994cf0be5a6a9a1e2&elqCampaignId=19104 http://apx555.ap.com/ Amir...
  17. DonH50

    Jazz trumpeter Lionel Ferbos dies at 103

    Jazz trumpeter Lionel Ferbos dies at 103 http://my.earthlink.net/article/us?guid=20140719/aca0915e-925d-4bd2-a97f-a87fa0d1987a
  18. DonH50

    Lorin Maazel R.I.P.

    Not sure I've seen this here, been making the rounds (I saw it in my trumpet forum last week): http://www.castletonfestival.org/news/item/maestro-lorin-maazel-19302014
  19. DonH50

    Power Supply Bandwidth

    There has been a lot of debate about power cords and their impact on the system. Aside from a defective or severely undersized cord I am a skeptic, largely because a few feet of cable is not going to change the rest of the wiring in your house and beyond. However, I do want to clear up some...
  20. DonH50

    Bobby Womack R.I.P.

    Just read he passed away...
  21. DonH50

    All Your Life - Al Di Meola

    All Your Life by Al Di Meola, a tribute to the Beatles. Anybody heard it, what did you think? Curious, thanks - Don
  22. DonH50

    Variable-Q Bandpass Filter

    An interesting spin on an old design. Thought I'd post it since it has percolated up just when I actually need to design a little BPF for a project...
  23. DonH50

    IEEE names Elvis' microphone a milestone

    Wasn't a microphone forum so this seemed the appropriate place. http://theinstitute.ieee.org/technology-focus/technology-history/iconic-microphone-is-named-an-ieee-milestone
  24. DonH50

    Windows 8 Help Sites?

    I had to buy a new laptop. I am about done loading SW so hopefully this weekend can transfer some files over and try out the processing and graphics power. In the meantime, it came with Window 8 and I hate the interface. Partly because I am so used to XP (and somewhat with Win7), but mostly...
  25. DonH50

    Lawrence Leighton-Smith Very Ill

    Larry is one of the giants of classical music conducting. He suffered a massive heart attack about a week ago and is now under in-home hospice care. His wife, Leslie, has a Facebook page at https://www.facebook.com/conductorlawrenceleightonsmith . I'll be keeping them in my prayers...
  26. DonH50

    Feedback Article

    Sure to cause controversy... The comments are worth reading, too. http://www.edn.com/design/consumer/4418798/1/Negative-feedback-in-audio-amplifiers--Why-there-is-no-such-thing-as-too-much
  27. DonH50

    Dr. Bose Passes Away at 83

    Numerous regular news articles, but here is a look at the man many might not have seen: http://web.mit.edu/newsoffice/2013/obit-amar-bose-0712.html
  28. DonH50

    Capacitor Distortion

    Capacitors can be ugly little things... Nothing new here, but in case you have not seen it before (or have forgotten, not that that ever happens... :) ) http://www.edn.com/design/analog/4416466/1/Signal-distortion-from-high-K-ceramic-capacitors Note -40 dB = 1 %, -50 dB = 0.1 %, -60 dB =...
  29. DonH50

    How do you get rid of that smoky smell?

    Amir's thread and current events led me to ask this one: How do you get rid of the smoky smell that permeates your house after a wildfire (or any fire)?
  30. DonH50

    Tube Amplfier HV Supply Control Circuit

    An interesting and somewhat amusing read for techies: http://www.edn.com/electrical-engineer-community/industry-blog/4412053/1/Audiophile-heaven

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