A redux. More pictures? Drawing?
Speaker Builder (aXp predecessor) Jan 90 had this one:
dave
Besides some MOSFET power amps in the early 80s I designed the Leslie-simulator CLS 22 that was produced by Dynacord/Bavaria
https://de.wikipedia.org/wiki/Dynacord_CLS_Serie
https://de.wikipedia.org/wiki/Dynacord_CLS_Serie
I remember that one. I had all the back issues of SB.
Here's a scan of the article. Hope it's OK to post. I'll take it down if it causes issues.
I don't have my brochure anymore (had kids no money for expensive speakers they would only trash). But here is one of their newer designs https://www.audiophysic.com/wp-content/uploads/2019/12/CODEX-REVIEW-Fidelity-47.pdf Interestingly they use ceramic foam now as well. Joachim Gerhard probably has some better internal pictures.
Fritz Pfleumer (invented magnetic tape 1928), Walter Weber (AC Biasing of magnetic tape mid 1930s), Friedrich Trautwein (electronic synthesizer 1930), Les Paul (overdubbing, tape delay, phasing, solid body electric guitar & multitrack recording).
It is copyright, excerpts are OK, the whole thing probabl not. But you are the author so i believe as long as it is a month past publication you are good.
dave
I'm no lawyer, but I think authors may post their manuscripts if they didn't sell the copyright, but not the published article. Any changes that the editors made are not the author's copyright.
In the 80's I "invented" and built an amplifier where the negative feedback was taken from the other end of the speaker wire. Based on this principle:
https://www.allaboutcircuits.com/textbook/direct-current/chpt-8/kelvin-resistance-measurement/
I think there were/are commercial products with this feedback method, so my idea was nothing new. Anyway, it worked and there was an article about it in a local audio magazine.
https://www.allaboutcircuits.com/textbook/direct-current/chpt-8/kelvin-resistance-measurement/
I think there were/are commercial products with this feedback method, so my idea was nothing new. Anyway, it worked and there was an article about it in a local audio magazine.
I did that a few years ago. Thought I'd be smart using RCA connectors at the speaker, to connect the feedback cable. No safety fallback resistors to the speaker output in the amp of course. Boy did it scream when the RCA plug was accidentally disconnected at the speaker.
Hi all.
First of all, I appreciate your posts and I thank you so very much for your valued contributions who not only tells about your invention/idea/change itself, but also says something more of your life and that just for this it represents itself as a second appreciated contribution. 👍
However, IMO I believe that claiming the absolute paternity of an idea (one can certainly continue to do it, but maybe it's not exactly the spirit of the thread) is not very simple and it is probably enough to describe what has been done or what has been invented and/or expanded from an existing one so that the contribution is "valid".
Just sayin'...
So, just to distract the attention from copyrights and patents and just to contribute with a patent that I could maybe have requested, but which would then prove to be useless, I can only tell you the following, but first I have to premise that it is not an idea related to Audio and therefore I kindly ask you to forgive me in advance for that.
Simplifying things, those who mean IT will know that when you turn on a PC the first routine that will be performed by the machine is contained in a (small) program coded in a chip called BIOS and that exists in all PCs and that manages the various related peripherals and which of these peripherals (if suitable for the purpose) can be "started" to the boot, that is, on which peripheral you have an operating system (also acting only from command line) with which you can interact after its "Welcome".
Almost always the means (the drives) by which a PC is starting is a hard disk drive, today a Solid State Drive that is practically the same thing, but without mechanical parts in motion.
Those who mean IT will perhaps remember that in 2008 it was possible to boot a USB stick, but only if the BIOS had a determined feature that de facto was very rare.
So starting a PC from a USB stick was the prerogative of a few exceptions.
After working up, I made a discovery that is currently present in many booting tools although without even mention my nickname of the time
, which made almost every USB stick capable of booting from almost every PC.
Please note that really the culprit was the BIOS of the machines of that time which did not allow the USB stick to boot, but on the BIOS you cannot act to modify it for that purpose so I thought to act on the USB stick (which was the innocent) creating an extra partition in order to make the BIOS believe that it was instead a hard disk drive and so could have booted, and then that's just what happened. 🙂
Please note that after a long time I certainly don't care about being mentioned or not, but at the time the ego claimed its part and therefore I understand all of you too... 😉
First of all, I appreciate your posts and I thank you so very much for your valued contributions who not only tells about your invention/idea/change itself, but also says something more of your life and that just for this it represents itself as a second appreciated contribution. 👍
However, IMO I believe that claiming the absolute paternity of an idea (one can certainly continue to do it, but maybe it's not exactly the spirit of the thread) is not very simple and it is probably enough to describe what has been done or what has been invented and/or expanded from an existing one so that the contribution is "valid".
Just sayin'...
So, just to distract the attention from copyrights and patents and just to contribute with a patent that I could maybe have requested, but which would then prove to be useless, I can only tell you the following, but first I have to premise that it is not an idea related to Audio and therefore I kindly ask you to forgive me in advance for that.
Simplifying things, those who mean IT will know that when you turn on a PC the first routine that will be performed by the machine is contained in a (small) program coded in a chip called BIOS and that exists in all PCs and that manages the various related peripherals and which of these peripherals (if suitable for the purpose) can be "started" to the boot, that is, on which peripheral you have an operating system (also acting only from command line) with which you can interact after its "Welcome".
Almost always the means (the drives) by which a PC is starting is a hard disk drive, today a Solid State Drive that is practically the same thing, but without mechanical parts in motion.
Those who mean IT will perhaps remember that in 2008 it was possible to boot a USB stick, but only if the BIOS had a determined feature that de facto was very rare.
So starting a PC from a USB stick was the prerogative of a few exceptions.
After working up, I made a discovery that is currently present in many booting tools although without even mention my nickname of the time
, which made almost every USB stick capable of booting from almost every PC.Please note that really the culprit was the BIOS of the machines of that time which did not allow the USB stick to boot, but on the BIOS you cannot act to modify it for that purpose so I thought to act on the USB stick (which was the innocent) creating an extra partition in order to make the BIOS believe that it was instead a hard disk drive and so could have booted, and then that's just what happened. 🙂
Please note that after a long time I certainly don't care about being mentioned or not, but at the time the ego claimed its part and therefore I understand all of you too... 😉
I sometimes get too much credit. In 2003, I wrote an article about phono preamplifier noise that included two example circuits with electrically cold input resistances. I later saw websites claiming that I had invented electrically cold input resistances, even though the article included a reference to the 1978 article of Hoeffelman and Meys. They didn't claim to have invented it either, as the original idea at least dates back to 1939, when W. S. Percival and W. L. Horwood demonstrated it.
You are correct. Kenwood had something called Sigma Drive.
http://www.cieri.net/Documenti/Kenwood/Documenti tecnici/Kenwood - Sigma-Drive Technical Guide.pdf
Cool idea. Seems like a good application for the Speak-On connectors so that the feedback loop doesn't get broken as easily.
2003 i believe on the Mac and you were always able to boot from FireWire.
dave
Edit, it was 2006, USB boot required an Intel procesor.
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I tried to summarize as much as possible my previous post, but really there would have been even more details.
Yes, Intel Processor and Windows as an operating system: everything is related to this binomial combination.
I'll tell to the present verb, but you really have to go back to 2008 tech status.
In addition, I'm talking about a USB stick, not a USB Hard Disk Drive that instead booted more easily because it was really a hard disk.
The fact is that (any version of) Windows (at the time it was XP SP3 if I remember correctly, then it was Vista, etc. Actually I run Windows 7 Ultimate and do not use Windows 10 nor 11, but I think they learned the lesson today) recognizes a USB stick like Removable Disk and the BIOS of that time did not boot a removable stick except in rare circumstances.
SanDisk made USB stick as Fixed disk, but it is also a rare exception.
For believing the BIOS that instead of a USB stick it was a USB Hard Disk it was enough to create an extra partition on the USB stick, my idea was just that.
And, as a matter of fact, then seeing 2 partitions on the USB Stick the BIOS believed it was an HD USB and booted it!
Not always, since it depended from what controller had the USB stick and what features had the BIOS, but almost always.
But under Windows it is not possible to partition a USB stick with more than 1 partition, unless you intervene on the internal controller of the USB stick with a special tool by flipping the Removable Bit of the USB stick to Fixed (that's to HD mode) or using a dedicated procedure to create an extra partition.
But very few USB stick had the related tool and at the same time the possibility of flipping the Removable Bit.
A not very simple, but working procedure was to be used, taking into account that even after creating an extra partition on a USB Stick as Removable Disk (just as almost all ones) then Windows did not see that partition (or the other one), but that didn't matter since the extra partition could have a very small size and it was enough to make flawslessly work the trick.
Hoping to have been a bit more comprehensive, please note that since English is not my 1st language at this time (almost 10:00 PM) it was not very easy for me, but I had fun doing it.
Sent without re-reading...
Yes, Intel Processor and Windows as an operating system: everything is related to this binomial combination.
I'll tell to the present verb, but you really have to go back to 2008 tech status.
In addition, I'm talking about a USB stick, not a USB Hard Disk Drive that instead booted more easily because it was really a hard disk.
The fact is that (any version of) Windows (at the time it was XP SP3 if I remember correctly, then it was Vista, etc. Actually I run Windows 7 Ultimate and do not use Windows 10 nor 11, but I think they learned the lesson today) recognizes a USB stick like Removable Disk and the BIOS of that time did not boot a removable stick except in rare circumstances.
SanDisk made USB stick as Fixed disk, but it is also a rare exception.
For believing the BIOS that instead of a USB stick it was a USB Hard Disk it was enough to create an extra partition on the USB stick, my idea was just that.
And, as a matter of fact, then seeing 2 partitions on the USB Stick the BIOS believed it was an HD USB and booted it!
Not always, since it depended from what controller had the USB stick and what features had the BIOS, but almost always.
But under Windows it is not possible to partition a USB stick with more than 1 partition, unless you intervene on the internal controller of the USB stick with a special tool by flipping the Removable Bit of the USB stick to Fixed (that's to HD mode) or using a dedicated procedure to create an extra partition.
But very few USB stick had the related tool and at the same time the possibility of flipping the Removable Bit.
A not very simple, but working procedure was to be used, taking into account that even after creating an extra partition on a USB Stick as Removable Disk (just as almost all ones) then Windows did not see that partition (or the other one), but that didn't matter since the extra partition could have a very small size and it was enough to make flawslessly work the trick.
Hoping to have been a bit more comprehensive, please note that since English is not my 1st language at this time (almost 10:00 PM) it was not very easy for me, but I had fun doing it.
Sent without re-reading...
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Remote sensing is a very old technique, and I used it in an industrial product many years ago.
One time I thought it was a good idea to have all my HDDs in USB cases. Turns out Windows always noodles on the HDD while its running, which made things very slow. Putting it back into the system, it wouldnt boot. Windows, sensing I had it in a USB case, turned it into a "Windows To Go!" system, without giving me any choice nor indication of it doing so.
So I had to look up how to undo "Windows To Go!" and then it worked fine again. "Windows To Go!" - OOoooh! Pffft!
I had a similar issue with my XP install. Tjis is running on an old MacPro (free), it has 4 easy to access and instal HDD slots. I slid the Windoz disk out and moved it over a. spot. I then had to get the OS reauthourized with a call to M$. What a pain. In the Mac worls it is a no care and moving disls around was often needed to recver or repair.
dave
dave
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