"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets - Page 228 - diyAudio
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Old 20th February 2014, 06:04 PM   #2271
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Hi guys,

does anybody know, where I can get the “Semelab” ALF16P20W mosfets? I'm waiting for 3 months for my order now, but neither my dealer nor others are able to deliver.
Many thanks,

Stammheim

Last edited by Stammheim; 20th February 2014 at 06:13 PM.
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Old 22nd February 2014, 10:29 AM   #2272
manudrz is online now manudrz  France
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Many thanks Owen
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Old 27th February 2014, 12:16 AM   #2273
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Hi guys,

as the ALF16x20W were not deliverable fore several months, I took the ALF16x16W with lover voltage. As I use the amps only for midds and hights I don't really need a lot of power. My plan is to use one ps for the outputs and one ps for the ICs. I'd like to know your recommandation for the ps's. Which voltage should I use?
I first wanted to use my Hypex SMPS with 65V for the output, but should then take 75V for the ICs. As I might have to use voltage multiplier for that applikation I asked myself, if there are better ways to go...

Thanks,

Stammheim

Last edited by Stammheim; 27th February 2014 at 12:19 AM.
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Old 27th February 2014, 12:40 AM   #2274
rsavas is offline rsavas  Canada
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Think about it! a "wire" class amp (ultra-low distortion) and a smps? Are they a good mix? I say not, but that is only my opinion. I guess you have to try it to find out. Best is to try out both a smps and a traditional.
IDNR if Owen has posted his listening impressions and measurements using a smps?
As a minimum, use some inductors/ferrites in series and possibly followed by a cap multiplier ckt to power the LME49830.
I am going to use a few old Pioneer sx-1050 & sx-1250 transformer toroids that I picked up on the net, for about $50ea.
Bought new caps 4x22mF/80V & bridges
The sx-1250 is a dual secondary,
The sx-1050 is a single secondary, and will use the sx-1050 linear reg for the LME49830.
I do ? if a single pair of out devices can handle a sx-1250 transformer? the sx-1050 is a safer bet.
Putting one setup in a old Sansui G-7500, with new heatsinks.

Good luck
Rick
Attached Images
File Type: jpg sansui G-7500 mod 002.jpg (981.3 KB, 350 views)

Last edited by rsavas; 27th February 2014 at 12:51 AM.
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Old 27th February 2014, 01:24 AM   #2275
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Quote:
Originally Posted by rsavas View Post
Think about it! a "wire" class amp (ultra-low distortion) and a smps? Are they a good mix? I say not, but that is only my opinion. I guess you have to try it to find out. Best is to try out both a smps and a traditional.
IDNR if Owen has posted his listening impressions and measurements using a smps?
Owen has posted measurements with 2 or 3 different SMPS. Regulated SMPS performance was actually very impressive. They're posted earlier in this thread, search for DPS-600 I guess but I don't have time right now (it's work time in Aus).


Regards,
Chris
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Old 27th February 2014, 01:44 AM   #2276
rsavas is offline rsavas  Canada
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Chris, what are you using and evaluated?
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Old 27th February 2014, 02:05 AM   #2277
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Quote:
Originally Posted by rsavas View Post
Chris, what are you using and evaluated?
From the measurements that Owen posted and the power I needed I decided the DPS600 SMPS was the best option.

I've got the boards soldered and waiting for me to test but my speaker project has taken over so haven't done any listening with them yet.

I'm un-interested in sighted listening tests/comparisons. I reviewed the measurement data that Owen presented for the linear supply, DPS400, DPS600 and decided that the opportunity to get the custom DPS600 with low power rails for the input stage and separate rails for the output stage was just too appealing. It also allowed me to pursue the option of building the 4 amplifier channels into one enclosure.


For some background/context, I am building DSP powered active speakers. It's been a long project but I'm just building as time/money allows. LPUHP powering B&C DE250 in a 8in tractrix waveguide (this waveguide is the one I am most concerned about for system performance before having heard it all running, will wait and see how that turns out) and DPS600 + LME49830 The Wire Class AB driving 2 x Peerless 8in nomex woofers per side. MTM in sealed enclosures, only running down to ~80Hz with 'stereo' subwoofers powered separately (Aussie Amps 300W Class AB). Speakers and DSP are coming along ... I needed speaker design to be reasonably compact to fit with requirements of my better half since this system lives in my living room. But I wanted something that could be pretty unconstrained thermally (hence two 8in woofers for efficiency) and never going to be starved for power. The voltage of the DPS600 means I've probably got headroom to drive my speakers to 116dB SPL reasonably comfortably (from memory xmax of the woofer is the limit but it comes at ~300-350W RMS into 4R which is within the scope of what's possible with 55/65V power supplied to the amps). Later I expect to be using a few of Owen's DACs for the digital to analogue conversion too, complete The Wire system


Regards,
Chris
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Old 27th February 2014, 10:35 AM   #2278
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Hochopeper, I indeed could have told the same story...
Because I need four LME49830 amps, I'd have to use 4 DPSx00. That is definitely to much, so I'd like to use one ps for the output of all amps and one ps for the IC of all amps.
I don't care if I use the Hypex SMPS600, which has also really good measurements (I wondered, why nobody else made some tests with it instead of the here tested other ps' s) or buy some new transformers for it, but I want to be sure to get the optimum solution. As my woofers are powered by some D-amps, I assume that a linear ps should also do a good job, as whether there isn't much power needed nor I need frequencies below 200Hz.
I also read through the whole thread and surely miss some informations, as I'm now at page 82... a lot of stuff...
Evenhow... I'm not sure about the voltage and the optimum combination for the outputs and the IC's, as transformers with less VA are not to get with more than 2x35, or 2x40V, what is not enough for this application using my Hypex SMPS600. So using linear supplies for both I'd have to take transformers with 2x25V for the outputs, which is less than I wanted.



Another question:
The cap multiplier is a good hint, but I'haven't found any schemata for more than +-35VDC. Would anybody share a schemata for such ps / cap multiplier / LC-filter for this application?
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Old 27th February 2014, 10:53 AM   #2279
AndrewT is online now AndrewT  Scotland
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the KM does any voltage.
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regards Andrew T.
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Old 27th February 2014, 11:00 AM   #2280
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KM?
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