I have read all of the articles by Nelson Pass, and then went back and tried to take notes on what topics were discussed in each. Here in the Pass forum, a few folks (myself included) are new, and hoping to find a decent starting point. For my part, I have compiled an index of the articles that I think are necessary for understanding the Pass amplifiers, including Zen Variations and First Watt.
The linked file is a first draft. If anyone has suggestions, please let me know. As I learn more, I hope to flesh out the guide and then make a final version before too long. At the moment, 4 pages (with two focused on the juicy bits) seems like a good length. I've included some very basic comments about some of the technology, but perhaps I could revise this to be more of an introductory tutorial which points to Papa's more in-depth coverage.
A Concise Guide to the Published Amplifier Circuits of Nelson Pass
Brian Willoughby
The linked file is a first draft. If anyone has suggestions, please let me know. As I learn more, I hope to flesh out the guide and then make a final version before too long. At the moment, 4 pages (with two focused on the juicy bits) seems like a good length. I've included some very basic comments about some of the technology, but perhaps I could revise this to be more of an introductory tutorial which points to Papa's more in-depth coverage.
A Concise Guide to the Published Amplifier Circuits of Nelson Pass
Brian Willoughby
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I hope to weave in more ties between the patents and the articles. So far, I have the main two patents. If anyone can help suggest articles which exemplify other patents, please let me know.
Now that I mention it, I should include the patents as if they were articles, despite the tendency for them to be much harder to read than Papa's natural prose.
Now that I mention it, I should include the patents as if they were articles, despite the tendency for them to be much harder to read than Papa's natural prose.
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useful link, if you want to have patents :
PAT2PDF - Free PDF copies of patents: Download and print!
look here , too :
http://www.google.com/patents?as_q=...inm_ap=0&as_miny_ap=&as_maxm_ap=0&as_maxy_ap=
PAT2PDF - Free PDF copies of patents: Download and print!
look here , too :
http://www.google.com/patents?as_q=...inm_ap=0&as_miny_ap=&as_maxm_ap=0&as_maxy_ap=
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so - numbers are ( dunno are links for download just temporary ) :
- 5710522 : http://www.pat2pdf.org/patents/pat5710522.pdf
- 5376899 : http://www.pat2pdf.org/patents/pat5376899.pdf
- 5343166 : http://www.pat2pdf.org/patents/pat5343166.pdf
- 4899387 : http://www.pat2pdf.org/patents/pat4899387.pdf
- 4107619 : http://www.pat2pdf.org/patents/pat4107619.pdf
- 4752745 : http://www.pat2pdf.org/patents/pat4752745.pdf
- 3995228 : http://www.pat2pdf.org/patents/pat3995228.pdf
- 5710522 : http://www.pat2pdf.org/patents/pat5710522.pdf
- 5376899 : http://www.pat2pdf.org/patents/pat5376899.pdf
- 5343166 : http://www.pat2pdf.org/patents/pat5343166.pdf
- 4899387 : http://www.pat2pdf.org/patents/pat4899387.pdf
- 4107619 : http://www.pat2pdf.org/patents/pat4107619.pdf
- 4752745 : http://www.pat2pdf.org/patents/pat4752745.pdf
- 3995228 : http://www.pat2pdf.org/patents/pat3995228.pdf
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btw.
dunno - either Papa is , in nature of his published circs , Zappawakoolike , or am I , in comprehensive ability , Zappawakoolike - but I can't see some special organization in his published circs ( go figure - it seems that SUSY patent goes before Aleph CCS patent ; if I remember correctly - he said somewhere that he patented SUSY , even if not fully digging it ; I'm not mocking here - he's the one who patented it , not silly Mighty ZM
)
meaning - I think that you must stay at documentary level , without trying to add agenda spice
dunno - either Papa is , in nature of his published circs , Zappawakoolike , or am I , in comprehensive ability , Zappawakoolike - but I can't see some special organization in his published circs ( go figure - it seems that SUSY patent goes before Aleph CCS patent ; if I remember correctly - he said somewhere that he patented SUSY , even if not fully digging it ; I'm not mocking here - he's the one who patented it , not silly Mighty ZM
) meaning - I think that you must stay at documentary level , without trying to add agenda spice
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I'm not sure that I follow you, but Papa does mention many times in the articles and Manuals that X and Aleph were out of order when comparing patents to products. Such is the nature of patents. They take anywhere from 9 to 18 months from filing to award. Also, some of Nelson's patents have never been used in a product, or the products were not very successful at all (not for lack of working, however).
One minor problem I had is whether to list patents by filing date or award date, but since I have focused on 'published' works, I think that the award date is the one. My next revision will have patents listing along with articles.
As for my idea of linking circuit designs to patents, I don't think that counts as "agenda spice." It should be fairly easy to see if a circuit is covered by a patent (well, maybe not so easy). At the very least, studying the Aleph active current source circuit well enough to recognize it in an article's circuit should be a good exercise, and the same goes for any of the other patents - it will just take time.
One minor problem I had is whether to list patents by filing date or award date, but since I have focused on 'published' works, I think that the award date is the one. My next revision will have patents listing along with articles.
As for my idea of linking circuit designs to patents, I don't think that counts as "agenda spice." It should be fairly easy to see if a circuit is covered by a patent (well, maybe not so easy). At the very least, studying the Aleph active current source circuit well enough to recognize it in an article's circuit should be a good exercise, and the same goes for any of the other patents - it will just take time.
That a very comprehensive overview. I'm flattered by the effort.
naah
just don't tell that you don't feel worthy
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All in a day's work (play?). Consider it my thanks for your inventions as well as your willingness to support understanding of audio circuitry through your articles.
Thanks for all of the positive remarks, folks.
I have updated the document by 'splitting' the Power Supply section into unipolar and bipolar or split rails. The original list was a bit too long, and it seems that the distinction between types should improve the utility of the list. There are some other, minor revisions as well.
I hope I am not being impatient, since the weekend isn't even over, but I was hoping to get some constructive criticism. Does anyone have suggestions for improvements? I suppose I may need to wait a while before someone volunteers to match up some of the older patents with specific circuits from the articles.
I have updated the document by 'splitting' the Power Supply section into unipolar and bipolar or split rails. The original list was a bit too long, and it seems that the distinction between types should improve the utility of the list. There are some other, minor revisions as well.
I hope I am not being impatient, since the weekend isn't even over, but I was hoping to get some constructive criticism. Does anyone have suggestions for improvements? I suppose I may need to wait a while before someone volunteers to match up some of the older patents with specific circuits from the articles.
