i cant let the final statement be incorrect. i am not talking assembly im talking instruction sets which include the op codes ie. a much more fundamental property.
every single commercial instruction set used by the general public has the basic operations of additions, multiplication etc and that is not a function of assembly code vs machine language altough its related to both.
ok, now im done... 😉
PLEASE tell me the OP code in machine language for a subtract or multiply or divide. THERE IS NONE🙂 The computer works ONLY on machine language, Assembly is converted to machine language.
THIS is my LAST post on this, IF you want to discuss this lets start a thread on it somewhere else
Thanks🙂
We interrupt our NORMAL broadcasting 😎
The thread is in pause mode... Designers,
Engineers and others are in a PARTS acquisition mode to pursue ACTUAL testing of amplifiers and attendant power supplies😱 for them...
Please stand by
We now return to NORMAL bickering, cajoling and bashing just for the fun of it.
Thanks🙂
The thread is in pause mode... Designers,
Engineers and others are in a PARTS acquisition mode to pursue ACTUAL testing of amplifiers and attendant power supplies😱 for them...Please stand by
We now return to NORMAL bickering, cajoling and bashing just for the fun of it.
Thanks🙂
Guys, in all honesty and seriousness... This amplifier will never outperform Goldmund sonically if some basic fundamentals are not followed:
1.) It has to use metal power MOSFETS, not plastic. Plastic ones will never perform as well.
2.) The input transistors have to be thermally coupled in a metal can (military part). Not two separate plastic transistors tied together with thermal grease.
3.) The amplifier MUST be direct coupled. No capacitors! This makes the design severely more difficult, but makes the amplifier significantly higher quality with significantly better sonics.
4.) Must have high slew rate. High slew rate = wider frequency band, better square wave performance, will be more in time and in phase at higher audible frequencies, etc.
Unfortunately, if you don't implement these fundamental basics, this project can never be as good as the original Goldmund Mimesis amplifier. Making it a waste of time for all of the people involved 🙁
So can all of you start with this basic idea and build your amp around it?
The original Goldmund is not the most stable amplifier, but it works and sounds incredible. If you want to address the stability issues that's fine. But if you sacrifice parameters that directly affect the sonics for stability, than what is the point?
1.) It has to use metal power MOSFETS, not plastic. Plastic ones will never perform as well.
2.) The input transistors have to be thermally coupled in a metal can (military part). Not two separate plastic transistors tied together with thermal grease.
3.) The amplifier MUST be direct coupled. No capacitors! This makes the design severely more difficult, but makes the amplifier significantly higher quality with significantly better sonics.
4.) Must have high slew rate. High slew rate = wider frequency band, better square wave performance, will be more in time and in phase at higher audible frequencies, etc.
Unfortunately, if you don't implement these fundamental basics, this project can never be as good as the original Goldmund Mimesis amplifier. Making it a waste of time for all of the people involved 🙁
So can all of you start with this basic idea and build your amp around it?
The original Goldmund is not the most stable amplifier, but it works and sounds incredible. If you want to address the stability issues that's fine. But if you sacrifice parameters that directly affect the sonics for stability, than what is the point?
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One can legitimately answer that stability has been traded
for a high slew rate.
Anyway, an instable amp doesn t sound good at all.
Surely that the blown goldmunds owners have speakers
that are particularly difficults for fast amps........
Wahab - Goldmund is NOT an unstable amp. It may be close to being unstable, but certainly not unstable. Potential Mimesis clones could theoretically be unstable if built improperly (poor PCB layout, etc.). There's a big difference there! You can test any original Goldmund Mimesis amplifier and you'll find with certainty, that it's indeed stable.
As I understand, the point of this thread is to make a very stable amp, so stability issues don't even come into play. That's a good goal and not very hard to achieve, with a little sacrifice here and there. However... If my listed fundamental basics are not implemented at all, then the sonic quality will no doubt be severely sacrificed.
Goldmund had a very fine balance, on a very thin line. Stability and sonic performance. Now electronics have tremendously advanced since the early 90s, so why not incorporate that into this new design?
What has been proposed so far could be a very stable amp potentially. And it could spec very nicely for certain parameters. But as a whole, it will not outperform the original Mimesis amplifier, not by a long shot. The fundamental theory of this new circuit and parts choice is significantly inferior.
Some of you have good intentions to make a modern, stable, excellent sounding amplifier. But because of the poor choice of the base topology, you will miss this goal completely and entirely.
As I understand, the point of this thread is to make a very stable amp, so stability issues don't even come into play. That's a good goal and not very hard to achieve, with a little sacrifice here and there. However... If my listed fundamental basics are not implemented at all, then the sonic quality will no doubt be severely sacrificed.
Goldmund had a very fine balance, on a very thin line. Stability and sonic performance. Now electronics have tremendously advanced since the early 90s, so why not incorporate that into this new design?
What has been proposed so far could be a very stable amp potentially. And it could spec very nicely for certain parameters. But as a whole, it will not outperform the original Mimesis amplifier, not by a long shot. The fundamental theory of this new circuit and parts choice is significantly inferior.
Some of you have good intentions to make a modern, stable, excellent sounding amplifier. But because of the poor choice of the base topology, you will miss this goal completely and entirely.
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You mean direct coupled with your cables or what? 😀
DC coupled it is already. 😉
And please don't worry the simulator guys will do their job, than it's up to us, guys with experience, to bring the design to higher level than you'll ever imagine. Wait and hear ...
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Again SOME fail to UNderstand that MIL Spec is Specification of the mechanical and thermal TESTING procedures that a component(resistors, capacitors, transistors etc.) must be subjected to in order to meet THAT mil spec.
The part must be tested and that testing has to documented. The procedure of the test must be done by Qualified and Certified persons and or companies.
Hence that testing is VERY expensive.
Which translates in to VERY expensive parts.
Those MIL SPEC parts are then given a JAN or NSN number packaged in Special packaging and then sold.
NONE of the parts of a Goldmund amp are mil spec.
Electrical testing for any of the NORMAL parameters of the transistors or other parts used are NOT a part of the MILITARY SPECIFICATION for certification.
I will not debate or further discuss this with anyone here about this project. For reference see Military Standards (MIL-STD), Military specifications, handbooks - spec
I am certified to MIL-S- 4574E, but that is JUST for hand soldering... not NORMAL bickering, cajoling and bashing just for the fun of it.
Thanks🙂
The part must be tested and that testing has to documented. The procedure of the test must be done by Qualified and Certified persons and or companies.
Hence that testing is VERY expensive.
Which translates in to VERY expensive parts.
Those MIL SPEC parts are then given a JAN or NSN number packaged in Special packaging and then sold.
NONE of the parts of a Goldmund amp are mil spec.
Electrical testing for any of the NORMAL parameters of the transistors or other parts used are NOT a part of the MILITARY SPECIFICATION for certification.
I will not debate or further discuss this with anyone here about this project. For reference see Military Standards (MIL-STD), Military specifications, handbooks - spec
I am certified to MIL-S- 4574E, but that is JUST for hand soldering... not NORMAL bickering, cajoling and bashing just for the fun of it.
Thanks🙂
Now in Electrical Engineering terms showing testing methodology:
Explain to the DIYaudio world
HOW and WHY with what reference you prefer Metal Transistors to Plastic ones.
Explain to the DIYaudio world
HOW and WHY with what reference you prefer Metal Transistors to Plastic ones.
where can you buy the shown dual J-fet....and does it have a sj74 type counterpart...??
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I think what sets this amp apart from most is the front end power supply.
However this power supply can definitely be improved on, and I think that is where most of the work has been directed with this version of the goldmund.
The other thing I like about the goldmund is no capacitors in the feedback loop.
The thing I don't like about it is the inductor on the output.
Once a prototype has been built then we will know how stable it is, and whether any compromises need to be made. If anything I would be trying to make it both faster and more stable.
However this power supply can definitely be improved on, and I think that is where most of the work has been directed with this version of the goldmund.
The other thing I like about the goldmund is no capacitors in the feedback loop.
The thing I don't like about it is the inductor on the output.
Once a prototype has been built then we will know how stable it is, and whether any compromises need to be made. If anything I would be trying to make it both faster and more stable.
Can someone please direct me to the post which has the final, or the most current version of the schematic? Thanks!
Krisfr - If the original Magnatec BUZ900 and BUZ905 metal MOSFETS are available from Newark (4000+ in stock) for $10 a piece, why would anybody in their right mind use the 2SK1058 and 2SJ162? The Hitachis are obsolete and the Renesas are guaranteed to be fake if bought on eBay from Honk Kong, or China. And if you get it from a reputable supplier, you're looking at $20 per piece, or so.
The Toshiba 2SK389 transistor is a great part. I did not see it in any of the schematics you guys have recently posted, but I would like to.
Krisfr - If the original Magnatec BUZ900 and BUZ905 metal MOSFETS are available from Newark (4000+ in stock) for $10 a piece, why would anybody in their right mind use the 2SK1058 and 2SJ162? The Hitachis are obsolete and the Renesas are guaranteed to be fake if bought on eBay from Honk Kong, or China. And if you get it from a reputable supplier, you're looking at $20 per piece, or so.
The Toshiba 2SK389 transistor is a great part. I did not see it in any of the schematics you guys have recently posted, but I would like to.
They sound better. Duh!HOW and WHY with what reference you prefer Metal Transistors to Plastic ones.
A pity these devices aren't available in a lacquered wood package. That would be the best.
2SJ162/2SK1058 are in current production according
to hitachi/renesas.
Just want to add that i m not a fan of dual serial
differentials, be it the goldmund iteration...
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Thanks Godfrey!
Wahab - Hitachi branded ones are obsolete. Renesas branded ones are current, but hard to find from a reputable distributor. At least for $10 a piece. I cannot stress this strong enough, the eBay Renesas from HK/China are 100% GUARANTEED to be fake. If anyone wants to sacrifice $10 and send one to me, I will prove it to everyone on this forum, by cutting it open and posting pictures.
Wahab - Hitachi branded ones are obsolete. Renesas branded ones are current, but hard to find from a reputable distributor. At least for $10 a piece. I cannot stress this strong enough, the eBay Renesas from HK/China are 100% GUARANTEED to be fake. If anyone wants to sacrifice $10 and send one to me, I will prove it to everyone on this forum, by cutting it open and posting pictures.
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OH I see, those BUZ900 and BUZ905 that are availible in PLASTIC as the BUZ900P and the BUZ905P with
IDENTICAL ELECTRICAL SPECIFICATIONS
😀Thanks😀