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Old 22nd May 2012, 01:29 PM   #51
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Originally Posted by SY View Post
Dirk, the article on the headphone amp is well worth reading. The schematic posted here is the unity gain buffer section. The overall design has 12dB of gain.
OK, thanks for that information. I'm still not interested enough to pay for the article.

I read here:
Class A amplifiers
Figure 3a basically shows the output stage. He doesn't like it.
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Old 22nd May 2012, 01:33 PM   #52
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Originally Posted by homemodder View Post
That depends on your headphone impedance.

Please be polite, I dont want to say too much otherwise Ill have the designer and linear audio on my back, theres an obvious money trail going about.
It will have to be upto them to disclose the circuit if they want, for others that dont understand it I can at max give a hint or two. You dont need his book, this stuff is available on the internet.
Thanks, but I have my own designs that I like plenty good enough. I've been doing my own spice models for a little while now and developed some circuits I think are pretty cool. I don't need to read about someone else's "magic" circuit. I've already figured out that the output stage in this Marsh headphone amp isn't that great, for example.
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Old 22nd May 2012, 01:33 PM   #53
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Simon B

I think Linear Audio does provide benefit for this DIY forum (even for those who dont buy the magazine).
I suspect the motivation behind the volumes is more to keep interest in DIY audio than profit. The books are well made, the authors seem to be for the most part members here and it is clear from the articles that months of work went into them (let alone the fact of knowing that at least this forum will try to dismantle much of what they show). There are no advertisements, and claims are backed up with analysis or measurements.

I love the DIY 3D layout and similarly the price seems to negate any profit.

Commercialism didnt even enter my mind until I saw your post. I can understand your view, but having enjoyed all the volumes to date and seeing the overall benefit to this DIY forum I glad to see this thread.

Hope this helps
-Antonio
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Old 22nd May 2012, 02:03 PM   #54
SY is offline SY  United States
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Quote:
Originally Posted by dirkwright View Post
Figure 3a basically shows the output stage. He doesn't like it.
Devil's in the details. RM's circuit runs in class A, the figure you reference doesn't. IMO, class A is no big deal, but I can't argue with RM's results, the measurements Jack showed were outstanding.

I've got no dog in this hunt, I hardly ever use headphones, but the article was educational, and it's interesting to understand the thought process that an experienced and accomplished designer uses. No doubt others are far beyond my abilities and this is all old hat to them, but I'm just a dumb chemist.
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Old 22nd May 2012, 04:00 PM   #55
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Thanks, but I have my own designs that I like plenty good enough. I've been doing my own spice models for a little while now and developed some circuits I think are pretty cool.
And you published or sold them, right?
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Old 22nd May 2012, 04:38 PM   #56
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Originally Posted by magnoman View Post
Simon B

The books are well made, the authors seem to be for the most part members here and it is clear from the articles that months of work went into them (let alone the fact of knowing that at least this forum will try to dismantle much of what they show). -Antonio
For several 100's of hours of work, this time I got myself a used mint Thorens 160A with a Shure V15 (before the wife spent it).
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Old 22nd May 2012, 04:44 PM   #57
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Now, here's a real FFT run with a real measurement instrument (not some POS soundcard, an Audio Precision SYS2722) to demonstrate what I experienced.
Not so fast, Bob Cordell's distortion magnifier and a sound card easily do measurements of simple THD that match the AP exactly.
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Old 22nd May 2012, 04:45 PM   #58
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And I keep finding the AP doesn't cover where I want to go!
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Old 22nd May 2012, 04:55 PM   #59
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And I keep finding the AP doesn't cover where I want to go!
Have Samuel send you his thesis, there are board layouts included.
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Old 22nd May 2012, 05:04 PM   #60
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His Msc Thesis? Or one of his web pages?
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