Hi megajocke,
Thanks for posting the picture. If this is the amp in question, no way. The rails are limited to 100 VDC maximum each for one. Then there is the copper trace width and what appears to be mains cabling to deliver all the power they are claiming.
It does appear to be a simple, straight forward amplifier. I do not see any form of thermal feedback for bias control either.
What I do "like" is that the original device markings have been removed and they have applied their very own house number. I wouldn't buy that product for this reason alone.
-Chris
Thanks for posting the picture. If this is the amp in question, no way. The rails are limited to 100 VDC maximum each for one. Then there is the copper trace width and what appears to be mains cabling to deliver all the power they are claiming.
It does appear to be a simple, straight forward amplifier. I do not see any form of thermal feedback for bias control either.
What I do "like" is that the original device markings have been removed and they have applied their very own house number. I wouldn't buy that product for this reason alone.
Very true. Our TV amp runs hot though. Even then the rms power would run around 5 ~ 8 watts. That represents peaks running 75 to 120 watts. We are using a digital source, so I'll assume an rms to peak ratio of 1 to 15.
-Chris
Actually, as they are lateral mosfets they don't need bias compensation as the temperature coefficent is zero at about 150mA instead of 10A+ as for vertical fets.
They are selling the FETs separately too:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=128163&perpage=40&pagenumber=1
From what I understand the transistors are produced by Semefab for Class D Ltd. and are essentially the same (identical maybe?) as Semelab's own BUZ901P and BUZ906P.
They are selling the FETs separately too:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=128163&perpage=40&pagenumber=1
From what I understand the transistors are produced by Semefab for Class D Ltd. and are essentially the same (identical maybe?) as Semelab's own BUZ901P and BUZ906P.
Hi megajocke,
Still, no reason not to include one. The Luxman LV-105u used lateral FET outputs and used a bias circuit. I guess I just hate seeing equipment that is not properly designed
-Chris
Still, no reason not to include one. The Luxman LV-105u used lateral FET outputs and used a bias circuit. I guess I just hate seeing equipment that is not properly designed
-Chris
I looked at the service manual, it uses Toshiba 2SK405/2SJ115 which are not laterals (GDS pinout and zero TC at 4 amps). They look similar to the newer 2SK1530/2SJ201. These do need thermal compensation unless you run them at a couple of amps of bias current (class A!) Pretty fun circuit with tubes in the middle of the poweramp 😎
Amps which did use laterals like Hafler, Citronic, Elektor Crescendo, Hitachi application note, Exicon application note, a lot of kits and so on do not have thermal feedback. Some did have a vbe multiplier, but not mounted on the heatsink.
The laterals are pretty fun devices, the negative temperature coefficient of current and some other effects make them almost indestructible compared to BJTs and vertical fets if gate drive voltage *and current* is limited 😀
Amps which did use laterals like Hafler, Citronic, Elektor Crescendo, Hitachi application note, Exicon application note, a lot of kits and so on do not have thermal feedback. Some did have a vbe multiplier, but not mounted on the heatsink.
The laterals are pretty fun devices, the negative temperature coefficient of current and some other effects make them almost indestructible compared to BJTs and vertical fets if gate drive voltage *and current* is limited 😀
information
Cirrus 18
May we see photos of your amplifier with CD-NX 200, expecially power supply module. In Mike's website there isn't trace of it and photos of assembled amplifier
thank you
leandro
Cirrus 18
May we see photos of your amplifier with CD-NX 200, expecially power supply module. In Mike's website there isn't trace of it and photos of assembled amplifier
thank you
leandro
Re: information
I have only built the Hypex modules. Follow this link:http://www.avforums.com/forums/8294433-post21.html and you will see this guy johysattuk. He is the one who built the Class D NX200. He signs his postings as Oldgeezer. Ask him, not me.
ecodoppler said:
I have only built the Hypex modules. Follow this link:http://www.avforums.com/forums/8294433-post21.html and you will see this guy johysattuk. He is the one who built the Class D NX200. He signs his postings as Oldgeezer. Ask him, not me.
Review
Here is a review of the NX200:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=141588
Here is a review of the NX200:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=141588
Long time...
no whatever. I drop in and have a read every so often but, since I'm prone to being useless and, at times, obnoxious, I don't post. However this one peaked my interest having read some of the other threads that this one links in to.
In particular Mr Soppelsas' marketing efforts balanced against his apparent technical prowess or rather lack thereoff. He has been prone to making some dubious claims whilst failing to back them up with reasoned argument or discussion.
I'll be lazy and recommend that you read all of his comments, Soppelsa and Class-D Design much of it is vapid and at times downright nasty.
In particular his responses to Anthony E Holtons' comment in the thread Aussie Amplifier thread, pages 14-15 where he feels the need to rag on the guy. OK so Holtons' single post might have been scathing but, in context of Soppelsa' other claims and actions elsewhere, it may have some validity.
Soppela on the other hand decides to totally rubbish Holton and then threaten him. Commercial dispute indeed. Frankly Soppela comes across, from my perspective, as someone I'm glad not to know.
Having said that... Since Mike claims a certain level of expertise with Class D amplification and electronics in general
Early Days
Do I smell snake oil?
News Group Postings
The announcements about the 'New' amplifier are very exciting, or should that be excitable. As to some basic questions about transformer and inductor design.... well, frankly this looks like someone who expects others to do the hard work for him. Strange that someone else had to design the new amplifier for him as well.
It's also nice to see that Mike appears to feel he has contacts with the Chinese manufacturing sector but this new product is being produced in Europe. I only mention it since long supply lines can cause delivery delays and quality control is hard to achieve under such circumstances..... It would seem that much of the rest of his companies product is Chinese sourced as well..... hmmmmmm?
By your deeds, actions and words shall ye be known. Pot, meet Mr Kettle..... and other such disparaging comments.
DNA
no whatever. I drop in and have a read every so often but, since I'm prone to being useless and, at times, obnoxious, I don't post. However this one peaked my interest having read some of the other threads that this one links in to.
In particular Mr Soppelsas' marketing efforts balanced against his apparent technical prowess or rather lack thereoff. He has been prone to making some dubious claims whilst failing to back them up with reasoned argument or discussion.
I'll be lazy and recommend that you read all of his comments, Soppelsa and Class-D Design much of it is vapid and at times downright nasty.
In particular his responses to Anthony E Holtons' comment in the thread Aussie Amplifier thread, pages 14-15 where he feels the need to rag on the guy. OK so Holtons' single post might have been scathing but, in context of Soppelsa' other claims and actions elsewhere, it may have some validity.
Soppela on the other hand decides to totally rubbish Holton and then threaten him. Commercial dispute indeed. Frankly Soppela comes across, from my perspective, as someone I'm glad not to know.
Having said that... Since Mike claims a certain level of expertise with Class D amplification and electronics in general
Early Days
Do I smell snake oil?
News Group Postings
The announcements about the 'New' amplifier are very exciting, or should that be excitable. As to some basic questions about transformer and inductor design.... well, frankly this looks like someone who expects others to do the hard work for him. Strange that someone else had to design the new amplifier for him as well.
It's also nice to see that Mike appears to feel he has contacts with the Chinese manufacturing sector but this new product is being produced in Europe. I only mention it since long supply lines can cause delivery delays and quality control is hard to achieve under such circumstances..... It would seem that much of the rest of his companies product is Chinese sourced as well..... hmmmmmm?
By your deeds, actions and words shall ye be known. Pot, meet Mr Kettle..... and other such disparaging comments.
DNA
Nuff said then
20 minutes after I post my message Soppelsa turns up for a read then vacates the space with nothing to say.
Care to have a barney Mike?
No..... Then I suppose you will be able to release Holton from your made up contractual obligation and publish that release here along with an apology then?
DNA
20 minutes after I post my message Soppelsa turns up for a read then vacates the space with nothing to say.
Care to have a barney Mike?
No..... Then I suppose you will be able to release Holton from your made up contractual obligation and publish that release here along with an apology then?
DNA
Re: Nuff said then
As regards a barney my phone number is 0044 7980 600373 please show some some courage and phone. I make no secret of my name or address I do not hide behind silly names maybe you should do the same
the reasons I do not post is because the conversations are of little factual interest just silly slagging as has recently been demonstrated on this thread.
However we have all the invoices and documentation of all monies paid to Holton for the contractual arrangements and so do the solicitors in Hobart Tasmania.
No we will not publish them however they have been handed to relevant tax authorities in Australia by the solicitors
We own all the IP and all the designs which we paid for, plus all the devices are ours which Holton does not have access to them. The original designs by Holton were seriously flawed and have now been corrected and improved by our involvement
So no apology and no release why should we release we paid for it in good faith. He managed to dishonour every agreement even after we paid for flights to uk accommodation and all his expenses over and above his contractual fee
So barney away but please get your facts correct
Mike
Genomerics said:
As regards a barney my phone number is 0044 7980 600373 please show some some courage and phone. I make no secret of my name or address I do not hide behind silly names maybe you should do the same
the reasons I do not post is because the conversations are of little factual interest just silly slagging as has recently been demonstrated on this thread.
However we have all the invoices and documentation of all monies paid to Holton for the contractual arrangements and so do the solicitors in Hobart Tasmania.
No we will not publish them however they have been handed to relevant tax authorities in Australia by the solicitors
We own all the IP and all the designs which we paid for, plus all the devices are ours which Holton does not have access to them. The original designs by Holton were seriously flawed and have now been corrected and improved by our involvement
So no apology and no release why should we release we paid for it in good faith. He managed to dishonour every agreement even after we paid for flights to uk accommodation and all his expenses over and above his contractual fee
So barney away but please get your facts correct
Mike
sadrac said:
I have a personal account called soppelsa that I use at home. The Class-D account is the one that we use in the office.
Not me, I'm a sniveling little coward. Anyway I don't believe a telephone conversation would do much good, apart from the fact you might end up shouting down the phone, you have already demonstrated that getting any 'facts' out of yourself would be like pulling hens teeth.
I'm sure I'm due a ban or time in Texas but.... what the hey? This one interests me because of your less than open behaviour, what seems to be misrepresentation of 'fact' and your apparent desire to gag another member. All very suspicious.
Still, lacking facts all I am left with is speculation and a bit of digging on the interwebs...
Before talking/asking about something else...
Alfet Amplifier
Selling date 28th Nov 2008
classd777 on Ebay
Interesting to see that you are no longer a registered user.
In the mean time I come across 'another' of your sites... how many do you have?
http://www.proaudio.ltd.uk/Mosfets.html
This one is interesting because we get to see some more specific details about these Lateral Mosfets that you are so pleased to deny certain people access to and, elsewhere on these forums, totally failed to provide meaningful information on them. I believe someone asked some pertinent questions and you said you would let them have some free ones to measure themselves.
It does set off alarm bells. Perhaps you are not the 'technical' contact for your company although from your statements here it would seem that you may well be. Most, dare I say legitimate, people selling semiconductors have real data sheets. Still, at least I have managed to find one... here you go
Alfet Mosfets
Document properties give the creation date as being 16th Oct 2008
The 12A and 24A devices in all there glory. We even get some input and output capacitance figures and some nice typical characteristic graphs. That's a good one for the FBSOA. DC current is 16A as in not 12A or 24A. My my. These graphs do look very similar to the Magnatec ones.
Not that I would be the sort to suggest that the datasheet is a cut and shunt of information ripped off from elsewhere.
Still, now you have reincarnated yourself from class-d.com to classd.ltd.uk we can see some more up to date, and less, information about your devices...
ACD100NSD
The useful graphs have disappeared and been replaced by an Audio Precision THD plot and, as mentioned elsewhere on the forum there seems to be a disparity between your quoted Rthj-c figure of 1.6C/W the 150W/25C case temperature power rating and maximum junction temperature figure of 150C.
Hint... either those figures are wrong or you are actually trying to sell what is, near enough, a 75Watt device as a 150Watt one. I'm sure that under different circumstances you would thank me for pointing out this error although, as mentioned, someone else has managed to do this already.
Mind you I suppose you might not know what you are talking about. Stranger things have happened.
Moving on, or rather moving back.... Remember...
Alfet Mosfets
Nice to see the NX-150 at the end.....
Thread start date 2nd August 2007
The other designs look very 'familiar' but perhaps that's just the layout format. I can guess where the influence may have come from, ay? Still, at the moment you are just selling the NX200 and NX400 so I'll assume that, even with your superior skills, could not get the other stuff working.
It's all very tortuous but it would be interesting to know the 'full' story behind your involvement with Anthony Holton. That's not likely to happen since it seems like you are in a position to gag him on the basis of some sort of contract and I would be left with your unqualified rants about the guy. Ho-hum.
Still given no facts but based on what I see and idle speculation leads me to the following, probably incorrect, conclusion.
You claim that these Lateral Mosfets, of which you appear to know nothing about, are UK produced...... blim. I know it's about somewhere. One of your multiple websites mentions Semefab as being a 'franchised' distrubutor or similar words. Anyway carrying on regardless, one off your claims/rants is that you have 'solved' inherent oscillation problems in the devices.
Then I'll add in the 'fact' that you manage to rate your devices, in terms of current, 50% higher than anyone else's and let's not forget about the other disparities. Ignoring other 'claims' you also manage to sell them for one off at as much as one quarter of the price of an 'equivalent' (lower specced) competitor product.
That, given what I have seen about you so far, is pretty unbelievable. Technically speaking I would not think you could be capable. In terms of the finance required to get it done it does not seem likely either. However it does look like you are a ducker and a diver so that leads me to this one.
Given the lack of meaningful data Your Lateral Mosfets are constructed from 'reject' or otherwise out of spec dies coming off someone's production lines before getting anywhere near final qualification. Semefab would not let you do that so you are getting them from elsewhere, China?. In the case of your double die devices the dies probably do not go through a matching stage, that would cost.
Overall what you are using and selling probably has so much deviation in its specifications, which you can't give, that trying to implement anything meaningful with them is going to be a wasted exercise and a definite candidate for 'oscillation'.
I can imagine that someone went through a great deal of pain to try and get your stuff to work. If what I am saying here is right then I'm sure, having suffered it, he is very happy not to have access to your dross. What does concern me is that he might be able to give a 'fuller' picture about what might have happened but, because of 'contractual' obligations, is unable to.
Me, I don't have any and I'm a bit bothered that you are swanning about the place rubbishing others whilst possibly trying to sell second rate tat.
Care to try harder Mike?
DNA
I'm sure I'm due a ban or time in Texas but.... what the hey? This one interests me because of your less than open behaviour, what seems to be misrepresentation of 'fact' and your apparent desire to gag another member. All very suspicious.
Still, lacking facts all I am left with is speculation and a bit of digging on the interwebs...
Before talking/asking about something else...
Alfet Amplifier
Selling date 28th Nov 2008
classd777 on Ebay
Interesting to see that you are no longer a registered user.
In the mean time I come across 'another' of your sites... how many do you have?
http://www.proaudio.ltd.uk/Mosfets.html
This one is interesting because we get to see some more specific details about these Lateral Mosfets that you are so pleased to deny certain people access to and, elsewhere on these forums, totally failed to provide meaningful information on them. I believe someone asked some pertinent questions and you said you would let them have some free ones to measure themselves.
It does set off alarm bells. Perhaps you are not the 'technical' contact for your company although from your statements here it would seem that you may well be. Most, dare I say legitimate, people selling semiconductors have real data sheets. Still, at least I have managed to find one... here you go
Alfet Mosfets
Document properties give the creation date as being 16th Oct 2008
The 12A and 24A devices in all there glory. We even get some input and output capacitance figures and some nice typical characteristic graphs. That's a good one for the FBSOA. DC current is 16A as in not 12A or 24A. My my. These graphs do look very similar to the Magnatec ones.
Not that I would be the sort to suggest that the datasheet is a cut and shunt of information ripped off from elsewhere.
Still, now you have reincarnated yourself from class-d.com to classd.ltd.uk we can see some more up to date, and less, information about your devices...
ACD100NSD
The useful graphs have disappeared and been replaced by an Audio Precision THD plot and, as mentioned elsewhere on the forum there seems to be a disparity between your quoted Rthj-c figure of 1.6C/W the 150W/25C case temperature power rating and maximum junction temperature figure of 150C.
Hint... either those figures are wrong or you are actually trying to sell what is, near enough, a 75Watt device as a 150Watt one. I'm sure that under different circumstances you would thank me for pointing out this error although, as mentioned, someone else has managed to do this already.
Mind you I suppose you might not know what you are talking about. Stranger things have happened.
Moving on, or rather moving back.... Remember...
Alfet Mosfets
Nice to see the NX-150 at the end.....
Thread start date 2nd August 2007
The other designs look very 'familiar' but perhaps that's just the layout format. I can guess where the influence may have come from, ay? Still, at the moment you are just selling the NX200 and NX400 so I'll assume that, even with your superior skills, could not get the other stuff working.
It's all very tortuous but it would be interesting to know the 'full' story behind your involvement with Anthony Holton. That's not likely to happen since it seems like you are in a position to gag him on the basis of some sort of contract and I would be left with your unqualified rants about the guy. Ho-hum.
Still given no facts but based on what I see and idle speculation leads me to the following, probably incorrect, conclusion.
You claim that these Lateral Mosfets, of which you appear to know nothing about, are UK produced...... blim. I know it's about somewhere. One of your multiple websites mentions Semefab as being a 'franchised' distrubutor or similar words. Anyway carrying on regardless, one off your claims/rants is that you have 'solved' inherent oscillation problems in the devices.
Then I'll add in the 'fact' that you manage to rate your devices, in terms of current, 50% higher than anyone else's and let's not forget about the other disparities. Ignoring other 'claims' you also manage to sell them for one off at as much as one quarter of the price of an 'equivalent' (lower specced) competitor product.
That, given what I have seen about you so far, is pretty unbelievable. Technically speaking I would not think you could be capable. In terms of the finance required to get it done it does not seem likely either. However it does look like you are a ducker and a diver so that leads me to this one.
Given the lack of meaningful data Your Lateral Mosfets are constructed from 'reject' or otherwise out of spec dies coming off someone's production lines before getting anywhere near final qualification. Semefab would not let you do that so you are getting them from elsewhere, China?. In the case of your double die devices the dies probably do not go through a matching stage, that would cost.
Overall what you are using and selling probably has so much deviation in its specifications, which you can't give, that trying to implement anything meaningful with them is going to be a wasted exercise and a definite candidate for 'oscillation'.
I can imagine that someone went through a great deal of pain to try and get your stuff to work. If what I am saying here is right then I'm sure, having suffered it, he is very happy not to have access to your dross. What does concern me is that he might be able to give a 'fuller' picture about what might have happened but, because of 'contractual' obligations, is unable to.
Me, I don't have any and I'm a bit bothered that you are swanning about the place rubbishing others whilst possibly trying to sell second rate tat.
Care to try harder Mike?
DNA
Mike can you tell me how you can get greater efficiency from your Lateral Mosfets, still keeping the mode of operation as CLASS-AB..............???
OR
||
||
||
||
\/
Simply naming the company as" CLASS-D design" offers a leap in efficiency..........
OR
||
||
||
||
\/
Simply naming the company as" CLASS-D design" offers a leap in efficiency..........
Genomerics said:
Coward seems to suit We are pretty sure we know who you are!!
However not really interested we have nothing to hide open about everything we do. Pity you could not get a single fact correct but of course we would not expect anything better from you at least we will give direct contact details anyone can visit our office and they can phone us and we give free samples.
So good web hunting!!!
Workhorse said:
Actually we do not claim any real leap in efficiency however they do run cooler than a lot of lateral mosfets because the old problem of high frequency oscillation is not present.
We do seem to taking a real bashing here however I would have thought hobbyists and people who want to make their own equipment would be grateful to us we can supply high quality amplifiers at a fraction the cost of anyone else and do not believe the knockers the qualiity and sound is superb. if we supply something that is faulty or the customer does not like it we will refund their money we are a phone call away
The name CLASS D is unfortunate but we will not change it, originally we designed class d amplifiers however it was apparent that in the market place we deal in class d amplifiers have problems not just ours but all of them, So we looked for a solution that suited the market place we do not really deal in HI FI and do not profess to be experts. But actually if you hear these amps going with our switchmode supply you will be stunned as are everyone who hears them is.
We comfortably get 1kw out of a 1 u amplifier 10 inches deep weighing 3 kgs
You should also be very wary of the efficiency claims of some of the class d amplifiers on the market far from truthful
The other reason we do not change the name is that we intend to introduce a new type of class d amplifier later this year
We supply these amps,power supplies and mosfets worldwide to very significant companies.
the comments from the previous idiot bear no relationship to the true facts
His gripe is that we are introducing power amplifiers in the UK cheaper than the far east can supply.
Class-D Design said:
I certainly welcome the new amps. There are >100,000 registered members here. A few a very vocal about certain things.
Simples...
And that was it?
Next thing I know you will be talking about 'ad hominem' attacks and 'straw man' arguments. Oh, well probably not.
Since you are pretty sure you know who I am then I would recommend that you 'blow' my identity.
If you are open about everything you do then can I have some proper details about your Lateral Mosfets. Specifications, source, foundary, packaging, manufacturer.... qualification process.
Can't be that hard.... can it?
DNA
Class-D Design said:
And that was it?
Next thing I know you will be talking about 'ad hominem' attacks and 'straw man' arguments. Oh, well probably not.
Since you are pretty sure you know who I am then I would recommend that you 'blow' my identity.
If you are open about everything you do then can I have some proper details about your Lateral Mosfets. Specifications, source, foundary, packaging, manufacturer.... qualification process.
Can't be that hard.... can it?
DNA
- Status
- Not open for further replies.