sorry I shouldnt have mentioned softstart. the main thing left is pic 6 of the dps400 and pic 3-4 of the 600. in turn off at wall to simulate failure of power from wall or accidentally pulling the plug out. 400 looks a bit uglier, I hadnt figured out the scale of the divisions for the output yet before my last post, so the 600 really doesnt seem too bad. the 400 looks a bit ugly, but i'm dying here, its nearly lunch and Ive been up since 3pm yesterday
Hi Guys,
Sorry for the delay, I meant to post my comments/thoughts and to explain a few things, but mwmkravchenko stopped by to pick up his kits and we got talking for a little while 🙂
Sooooo the DPS600. Well, it's certainly better behaved than the 400, and the transient response really is astonishing. There's very little sag under full load, and the little sag that is there ramps down slowly and evenly. When full power is removed there's absolutely no overshoot of the rails, and everything returns to normal in a smooth and controlled manner. I don't think it gets much better than this.
Having rails this strong means the amp runs much more efficiently and predictably, and I really do feel that it provides for better dynamic performance at higher output levels.
As for startup and shutdown, things generally look pretty good. The shutdown looks much worse than it really is, with peaks of less than 1V. You're looking at less than 0.1 watts into an 8 ohm load which isn't enough to damage anything, including a tweeter. It will be audible, however, with higher sensitivity drivers.
Startup is a little bit more of a concern, as at 400mA it takes a full 12 seconds for the supply to fully turn on. It seems like it's stuck in limbo at the 20V mark as it slowly builds up the courage get the rails up to full voltage. The good news, however, is that it's dead quiet on startup and there are no transients to worry about. Tomorrow I'll try and see if it will start at 600mA.
Overall, for bias levels of 400mA, I would give this a thumbs up. The only caveat being the slightly higher 120Hz peak in the FFT.
Regards,
Owen
Sorry for the delay, I meant to post my comments/thoughts and to explain a few things, but mwmkravchenko stopped by to pick up his kits and we got talking for a little while 🙂
Sooooo the DPS600. Well, it's certainly better behaved than the 400, and the transient response really is astonishing. There's very little sag under full load, and the little sag that is there ramps down slowly and evenly. When full power is removed there's absolutely no overshoot of the rails, and everything returns to normal in a smooth and controlled manner. I don't think it gets much better than this.
Having rails this strong means the amp runs much more efficiently and predictably, and I really do feel that it provides for better dynamic performance at higher output levels.
As for startup and shutdown, things generally look pretty good. The shutdown looks much worse than it really is, with peaks of less than 1V. You're looking at less than 0.1 watts into an 8 ohm load which isn't enough to damage anything, including a tweeter. It will be audible, however, with higher sensitivity drivers.
Startup is a little bit more of a concern, as at 400mA it takes a full 12 seconds for the supply to fully turn on. It seems like it's stuck in limbo at the 20V mark as it slowly builds up the courage get the rails up to full voltage. The good news, however, is that it's dead quiet on startup and there are no transients to worry about. Tomorrow I'll try and see if it will start at 600mA.
Overall, for bias levels of 400mA, I would give this a thumbs up. The only caveat being the slightly higher 120Hz peak in the FFT.
Regards,
Owen
yes, not bad when unpluged but is simple adapt perfect this smps with this amps. i mean dps-600 not have mistake, wire amp not have mistake but is good if we adjust small issue when both work. probable that in duration of startup (voltage remaining below 20V) wire amp is instable,maybe for lme voltage condition.
if Owen show pic 4 with probe on lme, i'm happy
Apart is simple tuned startup latency...eheh this i can touch.
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ok, see i'm happy now =) delerious but happy, quantifiable tweak-able numbers make stupidhead happy 
looks like i'm buying the 600, I too found the step response astonishing, any chance of some IM results to torture the amp and supply? muhuhahahuhaha
looks like i'm buying the 600, I too found the step response astonishing, any chance of some IM results to torture the amp and supply? muhuhahahuhaha
ahahahah! now you understand...that this dynamic behavior, resulting in realism of the timbre. hope is availlable...ahahah, jokeok, see i'm happy now =) delerious but happy, quantifiable tweak-able numbers make stupidhead happy
looks like i'm buying the 600, I too found the step response astonishing, any chance of some IM results to torture the amp and supply? muhuhahahuhaha
Thanks for the taking the time to rerun the tests, Owen!
120Hz is well below 100dB so it won't be an issue I think.
120Hz is well below 100dB so it won't be an issue I think.
I am leaning towards the DPS600 too, but what costs are we talking about as I would need 10.. I am also very anxious about the startup issues as I have no protection whatsoever on my $$$ drivers.
yeah shipping complicates things though if we are all over the planet, I wonder if we can arrange for them to still ship direct? i'll Shoot Roberto an email to follow up from Last night. not sure if I can post the pricing publicly or not; i'll shoot you a PM and confirm with Roberto
ahh thats right, I think OPC posted possible discounted pricing ages ago, so its probably fine, i'd still like to confirm though
ahh thats right, I think OPC posted possible discounted pricing ages ago, so its probably fine, i'd still like to confirm though
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Hi all,
First of all, really thanks to Owen for the time devoted.
For clarity, I think it is right to create a shopping list, this allows us to understand the needs and availability.
This is the DPS-600 Standard complete with regulators on board, only change I can do, is the startup time. I can reduce it to 4 sec.
it is possible to have two versions of voltage. (+ /-68V), another less, the choice with your help.
You can add up to a maximum of 2200uF per rail, close to the amplifier. sincerely, the improvement is very small. As you saw, this SMPS play on the speed.
some info:
An order of this SMPS, can be processed in 3 working days+ship, the time required to close the power unit and test.
Currently, there are 96pz of DPS-600. for a new production batch, it takes 30-35 working days.
DPS-400:
I solved the stupid problem (When Unpluged AC) and I set the startup current at 350mA (stable).
At short show
well, it's all for now
Ehm...sorry for my 16 bit on english..
First of all, really thanks to Owen for the time devoted.
For clarity, I think it is right to create a shopping list, this allows us to understand the needs and availability.
This is the DPS-600 Standard complete with regulators on board, only change I can do, is the startup time. I can reduce it to 4 sec.
it is possible to have two versions of voltage. (+ /-68V), another less, the choice with your help.
You can add up to a maximum of 2200uF per rail, close to the amplifier. sincerely, the improvement is very small. As you saw, this SMPS play on the speed.
some info:
An order of this SMPS, can be processed in 3 working days+ship, the time required to close the power unit and test.
Currently, there are 96pz of DPS-600. for a new production batch, it takes 30-35 working days.
DPS-400:
I solved the stupid problem (When Unpluged AC) and I set the startup current at 350mA (stable).
At short show
well, it's all for now
Ehm...sorry for my 16 bit on english..
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Would a delayed rail coupling FET/relay assist with the SMPS start up?
If the SMPS needs ~4seconds to pull up it's trousers, then delay the rails feeding the amplifier by 5seconds. Similarly those rail couplers could default to instant OFF on loss of Mains AC.
This does not mess with the amplifier design. It's all before the NFB loop.
If the SMPS needs ~4seconds to pull up it's trousers, then delay the rails feeding the amplifier by 5seconds. Similarly those rail couplers could default to instant OFF on loss of Mains AC.
This does not mess with the amplifier design. It's all before the NFB loop.
Hi,
see date
http://www.diyaudio.com/forums/solid-state/162219-my-idea-di-monoblock-esoteric.html
I completed 2 of these for my house two years ago
just out of curiosity, DPS-600 is not born now
see date
http://www.diyaudio.com/forums/solid-state/162219-my-idea-di-monoblock-esoteric.html
I completed 2 of these for my house two years ago
just out of curiosity, DPS-600 is not born now
Just one question as I didn't follow complete thread... DPS600 is suitable for both LME and mosfet voltage rails? I mean I can use one DPS600 for one channel? I can set...for example 65/55V on DPS600?
One dps-600 supplies both voltage eg. +/-68V and 85V for lme (or other difference,that Owen advice)
yes, one dps-600 for one amp (independant of power)
Is possible VADJ (trim on board) +/-5% Vout (lme follow in proportion)
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