New TK2050 board

[TCx]

Originally Posted by SoldierAnt76

I thought about trying a frameless power supply, but I was concerned about potential noise issues. Has anyone had a successful experience using an open frame power supply (Meanwell or otherwise) to power their amplifier, and if so what brand?

The noise, as I wrote above, comes from the SMPS itself. It seems to be generated by mechanical oscillations of one of its coils or transformers. Frame would not help here, I think.
Otherwise I haven't noticed any signs of EMI caused by the SMPS.
I have this SMPS feeding my AMT2050 V2.0 amp and it sounds excellent!

[alkasar]

Originally Posted by SoldierAnt76

I thought about trying a frameless power supply, but I was concerned about potential noise issues. Has anyone had a successful experience using an open frame power supply (Meanwell or otherwise) to power their amplifier, and if so what brand?

I have used for some months a Connexelectronic smps250 with a classD amplifier, a TDA8920 that requires dual voltage. There was no noise at all with the two board next to each other in a box made of wood.

Lack of noise has more to do with the design of the smps (filtering) rather than open frame IMHO. I will try this smps with hifimediy V2 board one of these days.

[Havoc08]

Originally Posted by SoldierAnt76

I think I should have said "parallel," not "bridge." But if a single TP2050 chip can operate in either a two channel (6/8 ohm) or a paralleled one channel (4 ohm) configuration (datasheet: http://www.datasheetcatalog.org/data...h/mXyzwqtx.pdf), it would be useful to have the ability to switch between the two modes (e.g., with a dip switch).

I don't know if this feature would be practical to implement. But it would make the board more versatile, and give more people a reason to buy it.

So can the 2x100watt really run 4 ohm?

Also, is there any sound quality difference between the ST505 and the ST508 as used in the 2x100w and 2x80watt respectively?

What voltage are the feedback resistors chosen for?

Do you have to drop voltage from 30v if you run 4ohm speakers?


Input appreciated, thank you

[Havoc08]

Also, would you go for a TA3020 solution or a TK2050(TC2000)+STA517B solution if you wanted more power?

[alkasar]

Originally Posted by Havoc08

So can the 2x100watt really run 4 ohm?

Yes

Also, is there any sound quality difference between the ST505 and the ST508 as used in the 2x100w and 2x80watt respectively?

Steinar who has listened to all versions, once said they sound similar.

Do you have to drop voltage from 30v if you run 4ohm speakers?

no. You need a psu that can deliver the needed power. The meanwell smps on the website does the job very well.

[alkasar]

Originally Posted by Havoc08

Also, would you go for a TA3020 solution or a TK2050(TC2000)+STA517B solution if you wanted more power?

depends on how much more power you need. Existing boards based on TA3020 such as 41Hz truepath or Connexelectronic V3 or v4 deliver more power than hifimediy T3 (at reasonable THD!).
TA3020 has good feedback. I have not yet seen a direct comparison STA517B vs TA3020. Would be interesting.

[teamacc]

I read on 41hz.com forums that the sta517b chip is a little quieter and thus better.
The truepath from connexelectronics has some questionable component quality.
The T3 seems better.

Also, one chip seems to have a little lower thd (or just better sound) than two, but, as you might notice, its only on 80w into 8 ohms, and, as board layout is a bit different, the little difference between the chips might be not noticed.

[Havoc08]

Thx for your replies

I am contemplating what to choose... T3 vs V2 amp vs all digital 5.1 (*hint* *hint* hifimediy ).

Maybe I should check the data sheets for the ST chips. I think the T amps sound very harsh when driven above 50-60% of max power. THD and IMD rises rapidly and maybe that is what I dislike about the sound (don't know how to distinguish between the two).

It would be nice not to run out of power on a 8 ohm speaker system, moderate sensitivity, if watching blu-ray movies with HD sound format (they have less dynamic range compression).

[Havoc08]

Hmm cant seem to find THD and IMD info on the ST chips.. anyone have them?

Similar to Tripath page 9 and forward TK2050 Datasheet pdf - Stereo 50W Amplifier Chipset - Tripath

[divxfr]

Hi,

I hesitate between T3 vs. V2 amplifier for my 5 speakers.

For five T3 should I take 5 power supply meanwell smps ? What are the alternatives ?
Is there a single power supply for five T3?

My speakers Klispch is two RF-82, two RS-52 and one RC-62.

In your opinion what is the best solution for these speakers ? T3 or V2 ?

Specifications RF-82

FREQUENCY RESPONSE 33Hz-24KHz ± 3dB
POWER HANDLING 150W RMS / 600W Peak
SENSITIVITY 98dB @ 2.83V / 1m
NOMINAL IMPEDANCE 8 ohms compatible
HIGH FREQ CROSSOVER 1400Hz

thank you for your reply.
Please excuse me for my english