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Old 7th August 2010, 12:28 PM   #561
sendler is offline sendler  United States
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Default Heatsink or pop

Quote:
Originally Posted by hifimediy View Post
May be there is something else will burn the chips that I don't know. Please tell me if you know anything(experience) about that.
That's a weird question but this is what I have seen so far:

1. The outputs will burn at 30v if the heatsink doesn't sit flush and tight.
2. The driver chip can die if there is a pop or peak over 5v on the input.

This chip set is more fragile than a 3886 but sounds much better.
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Old 7th August 2010, 12:51 PM   #562
hifimediy is offline hifimediy  China
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Quote:
Originally Posted by sendler View Post
That's a weird question but this is what I have seen so far:

1. The outputs will burn at 30v if the heatsink doesn't sit flush and tight.
2. The driver chip can die if there is a pop or peak over 5v on the input.

This chip set is more fragile than a 3886 but sounds much better.
Thanks for share your experience
For item 2, I think using 100pF MKP solder to the RCA connectors(from input+ to ground) will help to anti clipping. For TC2000 max input sensitivity is 1.5V, we have to control the gain of pre-amplifier too.
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Old 7th August 2010, 01:42 PM   #563
zog666 is offline zog666  Australia
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Join Date: May 2009
Mine (a v2.0) arrived in the mail a few days ago - just got around to quickly wiring it up to a 160VA 18V AC toroidal transformer.. so far so good! On first impressions sounding good, havent really put it through its paces yet.

Heatsink warm to the touch, putting my jaycar power meter on it measured 8W idle.
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Old 8th August 2010, 12:56 AM   #564
alkasar is offline alkasar  France
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Default waiting for T3

Hi guys, how far are we from T3 availibility ? waiting for it to build my "Arnold" amp project

Nick, I am sure you will provide the appropriate meanwell smps too, right ?
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Old 8th August 2010, 05:25 PM   #565
Charoenchai is offline Charoenchai  Thailand
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Join Date: Mar 2005
Location: THAILAND
Hi everyone.
What is the major part limiting V2 power ? ... Vcc, STA505 's current limit, coil current saturation or resistance of wire around the coil ....... Thanks.

Last edited by Charoenchai; 8th August 2010 at 05:41 PM.
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Old 9th August 2010, 04:26 AM   #566
Nick122147 is offline Nick122147  China
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Join Date: May 2005
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Quote:
Originally Posted by alkasar View Post
Hi guys, how far are we from T3 availibility ? waiting for it to build my "Arnold" amp project

Nick, I am sure you will provide the appropriate meanwell smps too, right ?
Not that far. We are testing it currently. I have been too busy last week, but have been using it a couple of weeks. The issue with the PSU board, "T3e" is that it wont turn on the relays when using 41V smps. It will power up the amps, so its not that the caps are putting the smps into failsafe, it's something else.. I have been running the T3 without the T3e, and it works good. There is a pop sound on on/off, which seems to vary with what kind of input is connected. With my DAC (both direct out ouput and RCA output) it makes a moderate but tolerable pop on turn on on my 99db speakers. (quieter sound on turnoff). But when I connected my ipod the pop was lounder, too loud to be tolerable on the 99db speakers. So the T3e would be necessary in some environments.
I have also experience a slight noise issue when powering both amps from one SMPS sometimes, but not all the time. Also on 99db speaker, on 87db speakers I havn't heard any.

A questions about smps:
the 48V 600W meanwell is more than 3 times as expensive as the 350W. Could we use 2 x 350W smps in parallel instead? I guess there has to be a drawback to this (noise?), else there wouldn't be any marked for the 3 x as expensive 600W. ?

One option would be to use 1 x 350W smps on each monoblock, but if using the T3e PSU board it would only be one input. Could maybe connect one smps to the psu board, powering only one amp, and another smps directly to the other amp? Both speakers should be muted by the relays when powering off the smps connected to the psuboard then.

alkasar:contact me if you cannot wait any longer
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Old 9th August 2010, 12:33 PM   #567
sendler is offline sendler  United States
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Default dual mono

Considering the amount of rated power you are after with this amp, I think you will find that running two 350 watt SMPS and two filter/ relay modules for a complete dual mono arrangement will sound the best and be the only reliable way to eliminate these phantom noise issues. I fear that you will have much grief with noise complaints if you market the two channel filter board. Also, is the heatsink temp ok to go up to 48v? I would measure the temp under the chip vs. the temp at the fins. That is a long way to pipe the heat from the chip to the fins. I would hate to see you have problems with heat failures when buyers start mounting that heatsink to a wooden case.
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Quote:
Originally Posted by Nick122147 View Post
Not that far. We are testing it currently. I have been too busy last week, but have been using it a couple of weeks. The issue with the PSU board, "T3e" is that it wont turn on the relays when using 41V smps. It will power up the amps, so its not that the caps are putting the smps into failsafe, it's something else.. I have been running the T3 without the T3e, and it works good. There is a pop sound on on/off, which seems to vary with what kind of input is connected. With my DAC (both direct out ouput and RCA output) it makes a moderate but tolerable pop on turn on on my 99db speakers. (quieter sound on turnoff). But when I connected my ipod the pop was lounder, too loud to be tolerable on the 99db speakers. So the T3e would be necessary in some environments.
I have also experience a slight noise issue when powering both amps from one SMPS sometimes, but not all the time. Also on 99db speaker, on 87db speakers I havn't heard any.

A questions about smps:
the 48V 600W meanwell is more than 3 times as expensive as the 350W. Could we use 2 x 350W smps in parallel instead? I guess there has to be a drawback to this (noise?), else there wouldn't be any marked for the 3 x as expensive 600W. ?

One option would be to use 1 x 350W smps on each monoblock, but if using the T3e PSU board it would only be one input. Could maybe connect one smps to the psu board, powering only one amp, and another smps directly to the other amp? Both speakers should be muted by the relays when powering off the smps connected to the psuboard then.

alkasar:contact me if you cannot wait any longer
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Old 9th August 2010, 12:36 PM   #568
sendler is offline sendler  United States
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Default Vcc

Quote:
Originally Posted by Charoenchai View Post
Hi everyone.
What is the major part limiting V2 power ? ... Vcc, STA505 's current limit, coil current saturation or resistance of wire around the coil ....... Thanks.
Vcc limits the power with a safe max of 30v.
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Old 9th August 2010, 01:04 PM   #569
alkasar is offline alkasar  France
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Join Date: Jan 2009
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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

Last edited by alkasar; 9th August 2010 at 01:07 PM.
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Old 9th August 2010, 01:11 PM   #570
alkasar is offline alkasar  France
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Quote:
Originally Posted by sendler View Post
Also, is the heatsink temp ok to go up to 48v? I would measure the temp under the chip vs. the temp at the fins. That is a long way to pipe the heat from the chip to the fins. I would hate to see you have problems with heat failures when buyers start mounting that heatsink to a wooden case.
good point. This is my plan...
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