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Old 27th June 2010, 11:46 AM   #331
sendler is offline sendler  United States
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Default Power consumption

Quote:
Originally Posted by Nick122147 View Post
Can anybody tell me how to calculate how long I can run this amp from two 12v batteries in series ? What is a resonable power consumation at normal speakers, or better, how do I measure power consumation?
You can measure the current consumption with a multi meter set to amps. It is a series measurement so you will have to connect the + wire from the batteries to the ground input of the meter. Connect the amps connector of the meter to the + input of the amp. Battery - still goes straight to the amp -. Measure amps on the larger scale. I would guess that it will be around 150ma at idle and 250ma - 300ma when playing music with 25v in.
.
Playing with the batteries in series shouldn't be any problem with uneven discharge unless there is a mismatch or one is going bad already. Chargers will be better in parallel which is why you often see an XLR connector used for the external battery connection.
.
If the amp draws 300ma then two, 3 amp hour batteries in series will play for 8-10 hours on a charge. If you forget to turn it off and leave it on for 20 hours (or a number of days), the battery level will go below the recommended discharge voltage of 11v each. Permanent sulfation will occur and you will ruin the batteries on the first try. This is what happens to many people using these amps with batteries.
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Old 27th June 2010, 12:22 PM   #332
teamacc is offline teamacc  Netherlands
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It is a symmetrical power supply.
Most tripath boards (except the ta3020) require a non-symmetrical psu.

The psu is usable, but bear in mind you only need one side of the power supply.

I think the helderhifi tk2050 looks ok, but it has no output relays, and, as most people complain about a pop-on noise on their tube buffer, I think you should add some relays.
Also, the heatsink looks quite small. Is it OK to use?

Last edited by teamacc; 27th June 2010 at 12:25 PM.
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Old 27th June 2010, 01:37 PM   #333
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Quote:
Originally Posted by teamacc View Post
It is a symmetrical power supply.
Most tripath boards (except the ta3020) require a non-symmetrical psu.

The psu is usable, but bear in mind you only need one side of the power supply.
dont know where you refering to ... but I would please be cleared up what this means: non sym. psu ? Does that mean that it makes no difference if you change GND and + connection points from the non sym. psus (most tripaths as you write above) ?

Sorry for the greenhorn questions
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Old 27th June 2010, 01:47 PM   #334
AP2 is offline AP2  Italy
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Hi Teamacc,
no,this PSU have CODE for order (see pic) single or double VOut,also if "Single" it possible use 2 way positive voltage(it have separate filter LC) for decouppling better amplifier (in case of 2 amp).
i think is very prof solution for assemble amplifier ,low profile.
no thermal problem,no noise,good at burst (bass frequency peak).
for curiosity only,dps-400 (no "S") identicall ,can supply one mosfet amp 400w(4R) (with PBTU module only).

Regards
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Old 27th June 2010, 02:00 PM   #335
AP2 is offline AP2  Italy
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To hifimediy.
Hi hifimediy,
It possible try you amplifier(buy)?
Only for test a new very small psu.

Thank
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Old 27th June 2010, 02:30 PM   #336
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Quote:
Originally Posted by redkid View Post
The sound is nice but only as loud as any of my 2020 or 2024 boards. I then reconnected my Sure 2050 board with the same source, speakers and power (~26v DC Sla) and it is much louder. Anybody have any suggestions or advice it would be most appreciated. Thanks
I have 2 of these boards and have tried them both with and without my Bryston pre-amp. I found that I can achieve near ear splitting volume levels with the volume controlled through the on-board pot and it certainly plays much louder than any of my 2024 amps. Maybe your board has a problem. With the Bryston pre, the gain appears to be less than that of the Sure 2050 but in the end it plays as loud as my ears can stand.
I am running this board at 30.3 volts through a meanwell 36 volt supply and it does get quite warm after 1/2 hour of playing at medium volume levels. The heat build up is certainly not as high as the Sure board. I can keep the palm of my hand on this heat sink without discomfort but could not do that with the Sure amp. That board gets really hot with stock heatsink and without the fan running.
I tried direct comparison between the two amps and could not tell much difference, it's hard to do when switching speaker cables back and forth. I think that this board has a slightly smoother sound quality and does not have as much hash coming through the tweeter and mid range as the Sure. There is a slight hiss with my ear to the speaker but it can't be heard when the music is playing. The noise from the Sure is louder but not a problem either. On the Sure, I have the fan running and the output filter has not been changed. I changed the fan wire to teflon insulated and shielded, changed the hook-up location, and applied aluminum tape to the fan surfaces and the fan noise pretty much disappeared.
I think that Hifimediy has done a nice job but I could do without the 3 pin input connecter. Terminal blocks would be better for a quick connection. I think that a fan might be required as well.
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Old 27th June 2010, 02:30 PM   #337
AP2 is offline AP2  Italy
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Hifimediy,I find it on ebay,sorry , I do not know this amplifier, reason I asked you.

Regards
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Old 27th June 2010, 06:02 PM   #338
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Quote:
Originally Posted by AP2 View Post
Hi all,
I see very nice amplifier also eg. Ta20xx etc. but not have suitable very good PSU.
this is compact very clear output (-78db hf-noise @ output) and have 100-120 hz active Power filter (mosfet).
I think that this info can help some DIY.
Regards
Hello AP2!
May you tell me where to find and buy the DPS-400 power supply?
Thanks, bye!
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Old 27th June 2010, 06:08 PM   #339
AP2 is offline AP2  Italy
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Quote:
Originally Posted by Don Jerry View Post
Hello AP2!
May you tell me where to find and buy the DPS-400 power supply?
Thanks, bye!
Hi, you can see on "audiopower.it".
DPS-400 is 480W Out 230VAC only. or DPS-400-S,250w out (110VAC).

Regards
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Old 28th June 2010, 01:00 AM   #340
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Hi there,

The MKI TK2050 does have relays, 2 of them actually, and there is no pop noise on this amplifier.

for the tube buffer a fix is available, a small board with 2 relays and a delay circuit that solves the pop problem, if there are people out there that want this, it is available.

the heatsink is plenty big! i've tested it under maximal power and it will not exeed 70 degrees in 30 deg ambient. compared to the shure boards its about 4 times the surface space per IC, mind you this is a MONO board, it has just one power IC and one TC200 IC.

Furthermore, the specifications i give are Measured, not guessed or taken from the datasheet, 40 watts over 8 Ohms at less than 0.2% THD and 60 watts at 4 Ohms at less than 0.2% THD.

i will post photo's of the measurements online later.

Greetings!

Arjen Helder
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