"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets - Page 218 - diyAudio
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Old 20th July 2013, 01:07 AM   #2171
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Quote:
Originally Posted by Robert F View Post
I have finally wired the modules into a dedicated chassis. Here are a couple of pic's the internal one is taken when near completion, there was still some insulation to be applied to mains connections and grounding of the switch mode supplies to safety earth.

The supplies are Audio Power DPA500 S-D, you can also see the additional capacitor board AP kindly provided me as a gift for slow delivery. As configured this provides another 4,000uf per rail of filter capacitors for the high current supplies, there is additional space for another 1,000uf per rail, but I wanted to be sure the supply was fine with a more conservative addition first.

So far I am delighted with the sound and it is virtually completely silent as long as I don't connect my sub woofer which appears to create a ground loop.

I would like to be able to bias the amps further into Class A but the DPA500 won't allow it on start up. Nevertheless the amp sounds better than when wired into my previous monoblock amp chassis. These had a 300va transformer per channel for high current and a 60va transformer per channel for the driver stage supplies. These supplies had a dual secondaries per transformer, electrostatic sheilds and Jensen 4 pole capacitors.

Regards,

Rob.
Rob, is that a grounding wire or a garden hose?
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Old 20th July 2013, 02:27 AM   #2172
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Originally Posted by 454Casull View Post
Rob, is that a grounding wire or a garden hose?
It is the mains wire direct to the front panel mains switch:-) The actual individual conductors are 11 ga so much of the overall diameter is cotton fill, but yes the overall diameter is substantial. I have run ground wires from the aluminium panels on which the supplies are mounted to the safety ground on the iec socket (not done at the time the pic was taken).
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Old 20th July 2013, 02:33 AM   #2173
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Originally Posted by AP2 View Post
Hello, sometimes it seems that something is moving on this thread..



@ Robert-F: I see cables delicious in the assembly, as well the vertical mounting of the two DPS-500.
From the picture I see you have the "S" version, this includes the remote control, you have not used? works well and is easy with 2-Pin, just "open / close".
The connector (CN4) is located near the vertical module.
As the DPS-600, this remote control in accordance with EEC regulations, has a very small absorption and can keep the stby for a long time.
maybe you can replace the switch on the front, with a circular 23mm diameter with double switches (one for each remote control).
For additional filtering capabilities, 5000uF per side is the maximum stated on the datasheet, I think you'll have a timbre very dry, especially on percussion hehe!
regards
Regarding the remote control, I am l am leaving that for later:-) The WIRE board has 1000uf local capacitance which is why I didn't fully populate the capacitor board.

Thanks AP2 for the great product.

Last edited by Robert F; 20th July 2013 at 02:37 AM.
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Old 20th July 2013, 05:37 PM   #2174
IanAS is offline IanAS  England
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Quote:
Originally Posted by Robert F View Post
I have finally wired the modules into a dedicated chassis.

sounds better than when wired into my previous monoblock amp chassis...300va...60va transformer per channel
Nice job.

How much capacitance did you have after those previous transformers?

How much output device quiescent current have you been able to achieve with the SMPS?
Quote:
Originally Posted by AP2 View Post
I'd be curious to know what happened to everyone else with the DPS-600 GB
What was the delivered price of the pair of SMPS? I don't recall seeing that anywhere so far. I think in the UK I'd pay no VAT. I might want to try a pair at some point in the future.

Last edited by IanAS; 20th July 2013 at 05:45 PM.
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Old 20th July 2013, 09:42 PM   #2175
AP2 is offline AP2  Italy
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Quote:
Originally Posted by IanAS View Post
Nice job.

How much capacitance did you have after those previous transformers?

How much output device quiescent current have you been able to achieve with the SMPS?

What was the delivered price of the pair of SMPS? I don't recall seeing that anywhere so far. I think in the UK I'd pay no VAT. I might want to try a pair at some point in the future.
Hi IaNas,
The DPS-500-D start with low price, I saw in shop € 140 without VAT
but has no output x LME. someone who asked via email @ infoAP, (as Robert-F), paid a supplement of € 20 each, for lme voltage output. consider that this requires a new transformer rewound.
I believe that these offers are aimed to raise awareness of this fine product.
otherwise, it seems inconceivable to ask the company that produces this power-unit, one or two transformer with different specifications.
Now the time is ripe to understand the substantial differences between one product and another.
--------

Startup-Current: I saw the test sheet right of these he bought Robert-F. since the startup test is repeated both "hot" and cold, it should be comfortable with 2x280mA @ 50V. from the side of the power-unit, this absorption means 2 * 14w = 28w.
from the side of the bias current in the amplifier, this is equivalent (in the case of + /-50V) to 280mA of bias.
This is a guaranteed value with a range of 210-250V VAC.
This limitation, certainly stupid can be overcome with an automatic bias (which I prefer whatever) whereas the DPS-500 supports up to 800mA quiet
Regards

Last edited by AP2; 20th July 2013 at 10:03 PM.
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Old 20th July 2013, 10:59 PM   #2176
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Hi IanAS,

I ran them at 360ma with the old supply. I couldn't get the power supplies to start up at that idle current and so reduced it to about 280 ma or so. I must see if I can implement switchable higher bias but the last thing I feel like doing right now is pulling the amp to bits again!

I was running 15,000uf per rail on the old high current supplies.

Last edited by Robert F; 20th July 2013 at 11:06 PM.
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Old 21st July 2013, 12:41 AM   #2177
IanAS is offline IanAS  England
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Thanks for that detail Robert, so that's a not too bad supply; 300VA and two 15,000uF of Jensen caps per amplifier, and it's beaten in sound quality by this SMPS.

But it remains to be seen how they'll do against the 400VA and 4 x 10,000uF of Nichicon grade 4 per mono block in my Meridian 605s.

Or the 1000VA and 6 x 10,000uF of Nichicon grade 4 I have ready for the next mono blocks.

But I think it seems a reasonable expectation that two of these SMPS will beat the single 500VA M0 cored Toroid and 40,000uf of standard Elnas in the Hafler DH200. But that's also about 130 for the tx and caps vs. 275.00 for the two SMPS.

Last edited by IanAS; 21st July 2013 at 12:48 AM.
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Old 21st July 2013, 11:47 AM   #2178
IanAS is offline IanAS  England
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This has no doubt already been stated and I've forgotten, but will these SMPS supply 70 to 80 Volts with 80 to 90 Volts for the early stage?
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Old 21st July 2013, 07:10 PM   #2179
qusp is offline qusp  Australia
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not that I know of no, they will do +/-65 for FE and +/-55 for mains though. do remember thats after the drop and they will drop much less than even a pretty hardcore unregulated supply. they have fully differential feedback on the high current outs also. check the squarewave response powering this amp at full power posted earlier in the thread, pretty unreal.
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Old 21st July 2013, 08:00 PM   #2180
IanAS is offline IanAS  England
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When you say 'on load' do you mean quiescent current or full power into 8 Ohms? My pal, below, gets very little rail drop at full power, IIRC he say maybe 1 volt, which would appear to be better than these SMPS are doing at much less power. And his 300Watt mono blocks make about 1000W into 2 ohms continuous using sine wave with no visible clipping. Mine should be bit better as he has 750VA toroids from the same people at the same time that I got the similar spec 1000VA made by and I'll have a bit more capacitance. I like the idea of the 'regulated' rails with this SMPS but I think I'll need a bigger one?

55V equates to not much power for a mosfet amp. My bipolar amp is only about 100W with it's 50V rails.

That's OK if you have efficient enough speakers, but I don't. My Hafler might be making perhaps 220W or so (RMS per channel into 8 Ohms) and the VU meter someone gave me flashes it's 200Watt light from time to time without the music seeming particularly loud. Maybe it's faulty, I don't know. But a pal with similar speakers made his own VU and that indicated upper power (about 220Watts) nearly all the time at normal listening level in his sound proofed and well damped room from a beefier and better amp he made that was similar to that Hafler. He went up to 300Watts after that with the same boards and two more mosfets, but two bigger Tx instead of the one, and the transient response was far better.

Last edited by IanAS; 21st July 2013 at 08:10 PM.
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