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Old 9th August 2010, 01:27 PM   #571
sendler is offline sendler  United States
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Default S-350

I think you may find that two S-350-48 MeanWell supplies cost less than one SE-450 anyway.
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Quote:
Originally Posted by alkasar View Post
I can wait a bit, but not too long

my view about smps for T3
available meanwell smps se series : 200 / 350 / 450 / 600 / 1000 / 1500

1. some people will want to build a mono amp. There will be a need for 350W smps
2. for stereo hifi, people will not use the full 2x300W. this is with 10% distorsion anyway. (BTW what is the max power of 517B with 0,1% THD in 4 Ohms?) Given the amp and smps efficiency, I am pretty sure that a single SE-450 is sufficient in most cases for a stereo amp.
3. for high power stereo amp, two times 350W in dual mono wiring is the best choice.

Some may want to build 5 or 7 channels HT poweramp, and want different smps combinations. But you can wait a bit to see where demand goes.

If it was me, given the high price of SE-600, i would start by providing SE-350 and SE-450 at appropriate voltage.
my 2 cents

oops almost forgot : T3e should allow dual mono wiring
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Old 9th August 2010, 01:53 PM   #572
alkasar is offline alkasar  France
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Quote:
Originally Posted by sendler View Post
I think you may find that two S-350-48 MeanWell supplies cost less than one SE-450 anyway.
humm... interesting.
unfortunaltely, S series stop at 350W max.
So the only advantage of a single SE-450 would be size.

BTW what exactly is the "phantom noise" you mentioned ?
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Old 9th August 2010, 02:34 PM   #573
hifimediy is offline hifimediy  China
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Hi, guys.
Finally we found what's wrong with the T3e. If power supply is DC, it will be polarity sensitive. The + of power supply have to be connected to the right screw for control circuit use, otherwise the relay will not turn on( but no harm to amplifier or other parts).
I have test it under 30~50V DC and it work good, but 36V~50V will be better for relay.
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Old 9th August 2010, 02:56 PM   #574
sendler is offline sendler  United States
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Default Noise

Quote:
Originally Posted by alkasar View Post
humm... interesting.
unfortunaltely, S series stop at 350W max.
So the only advantage of a single SE-450 would be size.

BTW what exactly is the "phantom noise" you mentioned ?
There are reports, and I can duplicate it, of an odd, low level noise when two separate boards are run off of one power supply. Even batteries. It is like a ground hum but higher in frequency. Some people call it a whistle. I would call it a tone. I believe it is caused by the near identical switching frequencies beating in interference and modulating the grounds. Full mono with multiple $40 S-350-48 will be the way to go with the 517b. I would probably order mine without the heatsink and give up the slim form for some more traditional stock that I already have that would mount the board right to the fins. Board and fins oriented vertically.
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Old 9th August 2010, 03:13 PM   #575
hifimediy is offline hifimediy  China
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For T3, we will prevent the noise by keeping different frequencies between boards. So We will mark the boards like : A/B/C...(which means different idle frequencie), then we can use different marking boards for multi channels.
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Old 10th August 2010, 01:11 PM   #576
hifimediy is offline hifimediy  China
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Default New 2.1 channel design

Hi, I was working on a new 2.1 channel amplifier for days. It's DDX and input S/PDIF directly ( so it's a power DAC actually) .
As a system, I add a mcu and HID like LCM, remote receiver and rotary encoder, etc.
I just think that will be another interesting project. Any ideas?
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Old 10th August 2010, 01:17 PM   #577
kc7wdg is offline kc7wdg  United States
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Looks neat how much do you think it will cost?
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Old 10th August 2010, 01:46 PM   #578
teamacc is offline teamacc  Netherlands
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Looking good.
Arjenshenzen/arjenhelder says he is working on something similar based on a ta2020 board (only without the .1 part :P)

Yours looks much more powerfull though.
Maybe try some smaller caps parallel instead of one big cap, it reduces the equivalent ESR.
Also, placing the buffercap(s) closer to the chips might be a good idea.

Will there be a separate board for the digital input?

Edit: i also see 2 Vins, does this mean this board requires a symmetrical psu?
As there is only one buffer cap, which cannot buffer both lines..
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Old 10th August 2010, 03:41 PM   #579
hifimediy is offline hifimediy  China
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I don't finished the first sample, but I hope the price will be another surprise
This is DDX which means no analog signal before output to speaker, which is different from TA2020(analog input itself).
The digital input are all built in on board now, so the HID(human interface device) part is now separated for convenience of installation.
And 2 Vins are for symmetrical AC input( half bridge circuit is used for AC-DC). If a DC power is used, single rail is enough.
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Old 10th August 2010, 03:52 PM   #580
Pano is offline Pano  United States
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New TK2050 board
I've used the DDX chips and like them very much.

Forum member Neil Davis knows them well.
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