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Class D Switching Power Amplifiers and Power D/A conversion

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Old 31st December 2010, 02:34 PM   #1241
jtjy is offline jtjy  Singapore
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Quote:
Originally Posted by hifimediy View Post
nice. I suggest to replace the bad one, because you will lose protection function when you use the wire. And happy new year to you all, my friends.
thanks a lot hifiemediy! really help me out as i am just a student at the moment and happy new year to u!
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Old 31st December 2010, 03:42 PM   #1242
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Bdbender, I know that probably people asked those questions multiple times before (and I found those questions indeed) however I didn’t find clear answers.
You are right actually about my skills – I can’t design power supply from scratch, but I can build one. Primary reason I want to buy this DIY kit is to save money (and it is not really DIY – more like PnP). Two 300VA transformers will cost less than 2 SMPS, so if they work fine I’m ready to learn more about AC-DC power supplies – this would be my next step.
So, I’d like to bump up my questions:
1. Are there objective differences between SMPS vs. transformers for T3? Or are they so close that it is more subjective?
2. If transformers are better or very close, is it better to use 1x800VA or 2x400VA? How about 2x300VA?
3. What is an optimal voltage for T3 -- 39, 42 or 45VDC?
4. What would you recommend as preamp? Hifimediy didn’t publish release date on his preamp so far, so I’m thinking Pass B-1 + input selector (like this http://cgi.ebay.com/Audio-Input-Selector-Relay-Board-12V-regulator-/250635746633). Do you have better ideas?
Thank you in advance.
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Old 31st December 2010, 04:45 PM   #1243
jtjy is offline jtjy  Singapore
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pass b1 is like a impedance matching pre amp. if u wan tube buffer, there are some choices for u.
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Old 31st December 2010, 05:46 PM   #1244
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I messed with fonts, sorry about it. Please ignore my previous post.

1. Are there objective differences between SMPS vs. transformers for T3? Or are they so close that it is more subjective?
2. If transformers are better or very close, is it better to use 1x800VA or 2x400VA? How about 2x300VA?
3. What is an optimal voltage for T3 -- 39, 42 or 45VDC?
4. What would you recommend as preamp? Hifimediy didnít publish release date on his preamp so far, so Iím thinking Pass B-1 + input selector (like this Audio Input Selector Relay Board, With 12V regulator - eBay (item 250635746633 end time Jan-14-11 05:21:52 PST)). Do you have better ideas?

Thank you in advance.
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Old 31st December 2010, 06:00 PM   #1245
jtjy is offline jtjy  Singapore
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for the pre amp, u can consider arjen's new tube pre amp.
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Old 31st December 2010, 08:49 PM   #1246
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Quote:
Originally Posted by SnowBarS View Post
I messed with fonts, sorry about it. Please ignore my previous post.

1. Are there objective differences between SMPS vs. transformers for T3? Or are they so close that it is more subjective?
2. If transformers are better or very close, is it better to use 1x800VA or 2x400VA? How about 2x300VA?
3. What is an optimal voltage for T3 -- 39, 42 or 45VDC?
4. What would you recommend as preamp? Hifimediy didnít publish release date on his preamp so far, so Iím thinking Pass B-1 + input selector (like this Audio Input Selector Relay Board, With 12V regulator - eBay (item 250635746633 end time Jan-14-11 05:21:52 PST)). Do you have better ideas?

Thank you in advance.
Hi, let's see if I can be more helpful this time... I don't have a set of T3s, but I did recently buy a T2 and the recommended Meanwell to go with it. It was more like hookup-and-play than DIY, and sounds unbelievably good for the price. I went with the SMPS after reading through this whole thread and in other places that class d amps like a very stable supply voltage, which the meanwells offer, and that people liked the sound of the T1s at least as well with the SMPS as with a conventional supply. I also think they are cost effective - hard to buy a decent toriod for what the whole Meanwell costs, let alone after adding decent filter caps to a conventional supply, good ones aren't cheap. So, if I were to buy a pair of T3s, I would also get the recommended pair of Meanwells to go with it. I would probably set the voltage at about 45, to leave a little slack between that and the 48v recommended maximum. Again, this is based on fooling with the T2, where I ended up at 27v rather than the maximum 30. You can play with the voltages on the SMPS just by turning a screw, something I also really liked.

The B1 buffer is well documented over on the Pass forum, and highly respected, and supported by various DIY threads and boards including the one you mention. More of a DIY project and less of a plug-and-play, though, that crew is into shunt-mode power supplies and balanced versions of inputs and outputs. Check out the "mezmerize" thread.

Hopefully someone who is actually using the T3s will chime in now!
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Old 1st January 2011, 01:26 AM   #1247
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Quote:
Originally Posted by whaleman View Post
Not sure what you are asking, but if you ask why there is not pot, maybe it is so you can use externally mounted pots, like on a chassis. I have one here pictured that I took the CTR pot off and bridged the connections. Then I used external individual pots mounted on the faceplate as shown. Works very well. This is the T1 80 watts @ 8 ohms, just finished yesterday. I am quite pleased with the HiFimeDIY product, it is crystal clear and extremely quiet, black background as they say. Breaking in now. Thanks hifimediy!
Sorry I didn't see your post last year, it's very nice, and will be a good sample we can follow.

Quote:
Originally Posted by Don Jerry View Post
Hifimediy, would be possible to make a T4 paralleled version (similar to T2)?
Power output would be doubled!
Hi, I can consider that, I'm still working on T4 and hoping it will become a total new member to class-T amps.

Quote:
Originally Posted by TCx View Post
Hifimediy, what about making a really high-end two-channel amp based on TC2000/2001 + STA517B (or other chips if there are any even better alternatives)and including SMPS? I don't mean using some exotic overpriced parts but using standard high quality parts and everything what would get the best from the chips and make the resulting amp really outstanding. There could be a high-quality input buffer, optimised PCB layout, several very low ESR el-caps close the the power stage, ceramic bypass caps very close to the power stage, short, wide and symetrical power lines, high quality film caps and output inductors, etc. The complete amp module incl. high quality SMPS should be mounted on an adequately sized, easy to mount heat sink. Such complete module would be easy to use in final application - user would have to place this module into some case and connect only power, input signal (optionally going through a pot or other volume control) and speaker terminals. Maybe you could produce it even as a complete (boxed) high quality stereo amp (for non-DIY'ers).
I know your existing products are already very good and simply excellent for the price but I believe it is possible to get even more from these excellent Tripath chips.

What do you and other members think? Is this a bad idea?
Hi, it's a good idea to make some complete amps and Nick and I believe we will do that in the coming year. But for boards, including a SMPS is not in my plan, because I think it will be dangerous to use (for diyers) and make things more complicated in some way. There are many very good SMPS for sale and we can also choose a transformer. And I don't refuse to try new ones if it's really interesting.
What's your opinion?

Last edited by hifimediy; 1st January 2011 at 01:29 AM.
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Old 1st January 2011, 09:24 AM   #1248
Bernie7 is offline Bernie7  Singapore
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For the T3 +T3e + smps, is it advisable to use an AC power fuse, or do the smps' have built-in fuses already?
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Old 1st January 2011, 10:11 AM   #1249
Bernie7 is offline Bernie7  Singapore
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Quote:
Originally Posted by Bernie7 View Post
For the T3 +T3e + smps, is it advisable to use an AC power fuse, or do the smps' have built-in fuses already?
Had a look at the smps datasheet, so I should rephrase the question:
does the smps' short-circuit and overload protection render an ac fuse unnecessary?
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Old 3rd January 2011, 11:24 PM   #1250
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Hifimediy, any plans for a T1 with a STa517b output chip for 8 ohm speakers? This might be a killer amp and I'd be very interested in it. May I also suggest these input caps: Dayton 3.3 uF

I use them in all my T amps and find them to open things up (at least to my ears).
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Last edited by whaleman; 3rd January 2011 at 11:30 PM.
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