STK428-640
Thank you to everybody replies to my request.
I am a new menber, under moderation, I cannot email directly.
I am trying to get more informations about the Sanyo hybrids from the Italian distributor, I hope I'll have soon a list of the commercially available modules and the related data sheets.
In the USA it is possible to buy the Sanyo Hybrids through some Company selling spare parts kits for Sony/Jvc etc equipments.
My target is to develop some single channel PCB amplifiers using this Hybrids.
Thanks everybody again.
Maurizio
Thank you to everybody replies to my request.
I am a new menber, under moderation, I cannot email directly.
I am trying to get more informations about the Sanyo hybrids from the Italian distributor, I hope I'll have soon a list of the commercially available modules and the related data sheets.
In the USA it is possible to buy the Sanyo Hybrids through some Company selling spare parts kits for Sony/Jvc etc equipments.
My target is to develop some single channel PCB amplifiers using this Hybrids.
Thanks everybody again.
Maurizio
IVX said:
Just checked again - we're both wrong! 🙂
The resistors in question are actually 50mOhm - both on my UCD pcbs, and on the Philips reference circuit.
rogs said:
Probably your UcD something unique, but usually current sens res is DALE R005, where R equal decimal point.
Well, both my UCD180s current sense resistors have 'R05F' printed on them, and I think this one does as well (although one is seriously burnt, by the look of things!)
Add to that my Philips PCB, and the Philips circuit, and that's quite a lot of 'unique' amplifiers! 🙂
Add to that my Philips PCB, and the Philips circuit, and that's quite a lot of 'unique' amplifiers! 🙂
Those resistors are R05 (50mohm) on all 3 of my UcD180 modules.
Edit: Imagine that, posting at almost the exact same time out of nowhere!
Edit: Imagine that, posting at almost the exact same time out of nowhere!
Strummer61 said:
1) I really wouldn’t know, I have not heard all the others yet… ;-)
2) I’m running an NCD1 (New Class D) set on a set op Audio Physic Scorpion speakers right now as well as on a set of Audio Physic New Tempo’s.
In a strait contest between a Primare set and the NCD’s the later wins, hands down, no question about it. Much more open, playfull, detail (voice, solo’s,…) without being sharp or over enthousiastic (I hate the car-audio sound : “ much of everything”).
Each NCD is running on it’s own 1000VA trafo (as advised in this forum (at least 800VA)), no pre-amp just a single input on a simple pot. Works great for me..!!
Cheers, Eric.
rogs said:
On my Class-D design I've done at work I use the little SOT23-5 LMV7256 high-speed comparators, and sections of a 74HC132 Schmitt gate to perform the sensing and the 'hold-off' time. I tried using slow LM393 comparators but they simply weren't fast enough to protect the output FETs.
IVX said:
No, it's a post-filter feedback, bridged-output amp running on a +48V supply. The output FETs are Philips/NXP 21N06 parts.
LM393 comparators take over a microsecond to switch. Now I know that if the supply is 48V, and the output inductors (say) are 20uH, then di/dt is only 2.4A per uSec, so even a slow LM393 should be ok. Unhappily, my pile of blown-up 21N06 parts showed otherwise! With the 45nSec LMV7235 it stands up to the abuse with no problems.
Strange - you wouldn't think that the LM393 was too slow for that particular task - and my UCD180's certainly have that device fitted.
I also have a pile of dead Philips MOSFETS from my experiments, both with their own Demo pcb, and with my own later test circuits.
What I did find peculiar was that in every case it was always the low side MOSFET that failed, and as the 'scope showed the negative supply pumping furiously more negative under short circuit conditions, I began to suspect overvoltage failure - even though I had included the OVP published by Jan Peter in one of the early UCD 180 question posts.
Think I might try one of the high speed comparators......
(I must apoligise for having hijacked this thread -- just didn't know where else to post this particular discussion - sorry!)
I also have a pile of dead Philips MOSFETS from my experiments, both with their own Demo pcb, and with my own later test circuits.
What I did find peculiar was that in every case it was always the low side MOSFET that failed, and as the 'scope showed the negative supply pumping furiously more negative under short circuit conditions, I began to suspect overvoltage failure - even though I had included the OVP published by Jan Peter in one of the early UCD 180 question posts.
Think I might try one of the high speed comparators......
(I must apoligise for having hijacked this thread -- just didn't know where else to post this particular discussion - sorry!)
Strummer61 said:
The BelCanto Ref 1000 are (to my knowledge) based on standard B&O IcePower modules here from little Denmark. The IcePower modules are amazing in many ways, but I think it's fair to say, that they are not the most ''high end sounding'' of the Class-D amps. And I doubt, that it was ever the intention with the IcePowers to make high end amps.
For instance B&O are still using Class A/B amps for the mid/treble section of their own active speakers, IcePower for the bass. I believe this speaks for itself...
I have never heard the Hypex, but I have heard several people who compared IcePower, Hypex and NCD: They preferred the NCD sonically. The NuForce should be very good also, and I hope to compare my NCD amps to NuForce sometimes soon..!!
Note: If you need amps with high efficiency so that they stay cool even if build into speakers or what ever the NCD's might not be for you. They run quite hot (for Class-D amps), so they defenitely need a heat sink...
Here are a few pics of my amps...
http://www.badongo.com/pic/648738
http://www.badongo.com/pic/648737
http://www.badongo.com/pic/648735
Regards,
Morten
If it helps, I have only compared Coldamp to Hypex, and both of them sounding good, I clearly preferred Coldamp, even taking apart their higher flexibility and rudgedness.
Desmo said:
Are you certain about that?
Taken from the Beolab 5 tech specs:
POWER AMPLIFIER, LOWER BAS 1.000 watts, Class D, ICEpower
POWER AMPLIFIER, UPPER BAS 1.000 watts, Class D, ICEpower
POWER AMPLIFIER, MID RANGE 250 watts, Class D, ICEpower
POWER AMPLIFIER, TREBLE 250 watts, Class D, ICEpower
Click
IMHO, the reviews of BelCanto amps speak for themselves about the quality of the ICEpower modules. I have no idea how they compare to other class-D/T modules but, at least when it comes to the performance of the 1000ASP, we are talking about no-compromise sound.
TheShaman said:
No, I can't say for sure, but It's my impression, that often IcePower is just used for the bass in active speaker systems...
Regarding the reviews I have to disagree with you because in my opinion no reviews speaks for themselves. Reviewers can have wayyy different sound priorities than you, the review system is often very different than yours and finally there is the trend that all products tends to get fantastic reviews these days. So in my book reviews are just another type of advertisement and description of a product...
The only thing that really counts -in my opinion- is listening for yourself. ''Hearing is believing'' 😉
Cheers,
Morten
TheShaman said:
There seems to be a fact that B&O have gone for linear amps for mid and treble in their latest offerings of Beolab speakers, saying something cryptic about "we searched for something in this frequency range that suited our purpose..."
Regarding Audio Physics Class D mono blocks amps named Strada it was said to be an attempt to combine a low power Class A amp with Class D, so that at low output levels the mono blocks run in Class A.
They were expensive and disappeared from the AP product range even though they got very good reviews. As a matter of fact these amps used silk spun litz wire for the output chokes....
I agree to the claims about difficulties in reviewing amps or other hifi gear in an objective manner. German hifi magazines use to rank gear giving them a score (points) but we know that our hobby is more complicated than combining "top" gear. I have done tweaks that I don´t dare to mention as very few people would ever believe me...
🙄 However, I´m quite sure that the result of these "operations" were not just imagination.
As for ICEPower based amps many of them have been reviewed by the Norwegian magazine Fidelity, both known amps like Rotel and Jeff Rowland and more of the unknown variety as Midgard.
There findings for the bass reproduction e.g. is that the trailing edge are reproduced less clear than the top linear amps. The emphasis of the later or middle "phase" of the bass notes is something I dislike.
BTW, however good this Norwegian magazine (sorry that most of you can´t read it) is, they don´t seem to have discovered that there are many more suppliers of Class D modules like Coldamp, Hypex UCD or NCD. I really hope they will discover these and if , I will report their findings. 😎
Desmo said:
I agree with you about reviews but, at least when it comes to BelCanto REF1000s which I have heard, I can absolutely agree with them that these amps are up there at the top. My view is shared by a couple of friends who have huge experience of ultra-expensive gear.
The golden mean said:
Well Beolab 5, of which I posted the tech specs, is not exactly old and I think it their Flagship speaker. That should say something.
The golden mean said:
Please do!
AFAIK the Beolab 5 uses ICE-power throughout but its smaller brother uses it only for the bass range.
Regards
Charles
Regards
Charles
It sounds to me, that you have actually decided to buy IcePowered amps, and that is of course a nice choice...TheShaman said:
So if IcePower is the right amp for you I suggest, that you buy either the cheapest amp with the ''1000'' IcePower modules if you are on a budget, or the amps you think looks the best if you are not on a tight budget. They all sound the same because they all use the same standard IcePower modules...
Personally I don't find the sound quality from the IcePower amps quite as good as some of the alternatives, but that's just me 🙂
Cheers,
Morten
It was like a sensation when B&O did´t continue to use ICEpower in the triamp configuration. But I do believe that they did it for achieving a better overall sound. Opinions on ICEpower seems rather split ; you like them or don´t like them.
If I have to believe something I say that there are better alternatives. But of course how you implement the ICE modules counts as well.It may be factories that want a ready-made alternative (e.g. ICE ASP) without much tweaking that like them best? But then we are into SMPS territory as wll..
If I have to believe something I say that there are better alternatives. But of course how you implement the ICE modules counts as well.It may be factories that want a ready-made alternative (e.g. ICE ASP) without much tweaking that like them best? But then we are into SMPS territory as wll..
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