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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th March 2012, 11:16 AM   #2031
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Default T2 finished

Hi,

I finished my T2 based amp this week (in the chassis of a blown-up AMP5).
  • It uses the standard T2 board (hifimediy), which I will modify with better input caps. I did remove the pot also and replaced by Dale resistors.
  • SMPS300R 30Vdc (Connexelectronic)
  • A PGA2311 pre-amp module with LCD display (eBay), 3 inputs and remote control. I really like this preamp module wich is dead quiet (unlike the VC23 / PGA2310 board I have).
  • A softstart module for the T2 board (Connexelectronic). It switches the DAC and T2 on/off controlled by the preamp.
  • AK4397 DAC on board with C-core transformer (eBay)
I still need to do some work on the internal wiring, but that's just cosmetics. The sound of this amp is very much OK.

Maarten

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Old 10th March 2012, 12:23 PM   #2032
v-bro is offline v-bro  Netherlands
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Too bad you've got that Behringer on the same pic....

Nice work!
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 10th March 2012, 03:00 PM   #2033
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Quote:
Originally Posted by v-bro View Post
Too bad you've got that Behringer on the same pic....

Nice work!
Thanks. The Behringer is just to convert optical to S/PDIFF coming from the squeezebox. After all, I do have a DAC inside ..

Maarten
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Old 12th March 2012, 03:52 PM   #2034
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I got my T2 and smps300r power supply the other day, bought direct from hifimediy.com. I got them hooked up and mounted properly and fired up without an issue.

connected in my living room to my NatP towers, I could quickly hear an improvement over my modded Sure tripath build at similar voltage (28v). The low end was the greatest improvement by far. The high end of the spectrum just was a bit more pleasant as well. I noticed this amp doesn't get quite a warm, either.

Got a real winner here! Thanx for building such awesome amps for a great price! I'm definitely a satisfied customer.
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Old 16th March 2012, 01:32 PM   #2035
doc is offline doc
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Hi platenspeler is that a dot 2++ I see? if so have you tryed the preamp out .
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Old 16th March 2012, 08:34 PM   #2036
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Quote:
Originally Posted by doc View Post
Hi platenspeler is that a dot 2++ I see? if so have you tryed the preamp out .
Yes it's the Little Dot II++. I do use the preamp out every now and then to test one of the amps. It is a little on the soft side but in combination with the L20d amp it is quite OK.

You have one as well?

Maarten
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Old 17th March 2012, 12:14 PM   #2037
doc is offline doc
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You have one as well?
Yes I do and like it a lot.So Little Dot II++,Rogers Cadet 3, Sure 2x100,and now looking to get T2.
Pat
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Old 21st March 2012, 10:17 PM   #2038
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Ok, here goes my finished T1 Alps STA510A v1.2 + Connexeletronics SMPS300R


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Old 21st March 2012, 10:49 PM   #2039
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I've got some suggestions for Steinar or someone from HiFiMeDiy

VOffset Pots are either too large in resistance or has too few turns to adjust, is it 25 turns? If yes, you should consider a smaller resistance cause they are too much sensitive for that application and I needed a nail polish to make it fix. How many watts do I need on them if I'm up to change it?

Input capacitors are a bit harsh in the upper mid, but overall it sounds fanstastics, made some cheap speakers much more alive than Tapco S-5 Studio monitors by Mackie (deeper, faster, larger and much more detailed)

I will try some Solen anyway, anyone knows if Ero MKT1813 2.2uF should be good also? I don't speak french.

Input cable is too thin and delicate, it brokes almost from looking, but I like the input conector idea, made it easier for removing the board for modding. I could change for a bit thicker copper one.

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Old 22nd March 2012, 04:17 AM   #2040
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I've got a T2 Special board using 2x STA510 and have a doubt about it.

a single STA505 is capable of delivering araound 2x 50W Full Bridge.

a single STA510A is capable of delivering around 2x 100W Full bridge as seen on T1 1.2

Normal T2 board comes w/ 2x STA505 single bridge paralled, so it's capable of delivering around 2x 100W RMS

So why T2 Special delivers the same power as the normal one using STA505?

If it's using 2x STA510A paralled single bridge it should deliver around 180W each channel at 4Ohms, so why it's only rated 2x 100W? It isn't using a single bridge configuration for each chip? Where are the other 2 channels dead?
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