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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th December 2007, 04:32 PM   #1
JeremyB is offline JeremyB  United States
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Default Calling all T-AMP knowledge Gods... I need your help..

Good morning oh great and wise ones. Ok, I am sure this has been gone over a few times, and maybe I just couldn’t see it in my research. Here is my dilemma:

I am stuck between buying a Super T, a Trends Audio, building my own Amp6 basic, and then I saw yesterday this Charlize… sigh.. I am a COMPLETE novice as far as soldering, I don’t even think I own anything for it... but it cant be too hard.. right? I like the finished look of the trends and the SI.. but I like the price point of the DIY…That is probably the most important…. PRICE. I saw the finished product of the Charlize and like the wood box/finished look. and because I work with wood, I was leaning towards making my own enclosure. Then comes the part about what power supply, and what ends to put on, and volume knob and such. And lets not even get started on modding any amps yet.

Does anyone have a complete “parts list” for putting together one of these? (amp6 basic or Charlize?) I would assume you can get everything from PE.com...

And which would be best for me? I am building some full range Sachiko’s with Fostex drivers.. (I think they are around 96db/wt). My musical tastes run anywhere from Classical guitar to pop, to trance.. so the type of music is all over the chart.

One other question.. I have a power supply off of some old CSW computer speakers.. would that work for the PS? The info off the part that plugs into the wall: input – 120AC 60hz. Output 14vdc 1.2a.

Any and all help will be greatly appreciated. I suppose I should ask.. does anyone have one they want or would be willing to get rid of?
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Old 14th December 2007, 05:01 PM   #2
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Amp6 basic is sold as a kit with very nice pcb.Your power supply is on the small side for amp6 basic,but it could work.

P.S. I just noticed the thread is asking for knowledge Gods.I shouldn't have answered ,sorry
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Old 14th December 2007, 05:42 PM   #3
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I would highly recommend building the Amp 6.

Not only is it capable of handling a little more power than the T-amp, I think the implementation is better, especially when it comes to bass. I've done all the normal mods on a couple of T-Amps, and the Amp 6 just kills 'em as far as sound quality goes.

It's easy to build and it's very gratifying to put things together yourself. There' a million ways to put together a case.

As for the power supply, it should power the Amp-6, although you may decide to step up to a more powerful SMPS. The ones that are made for Flat-screen computer monitors seem to be great, and they're cheap as dirt on eBay. Be aware that 14v may be a little too high for the chip in the T-Amp, but it's fine for the Amp 6.

Good luck building!

--Buckapound
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Old 14th December 2007, 07:00 PM   #4
Pano is offline Pano  United States
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Amp6 or AMP6 basic if you want to DIY. Charlize if you don't.

If you are new to soldering, practice a bit before you start on the amp. Find some good tutorial on the web and read it, practice it. Take your time, it's more important to get it done well than fast.

Dittto what Buckapound says about PSU.
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Old 14th December 2007, 07:00 PM   #5
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I think you need to be in the middle ground here.
If you want the best then get a Charlize PCB (dont forget that it's all soldered for you) and box it up in a nice DIY enclosure with your own choice of RCA/cables/binding posts and pot etc...
Not the cheapest option but......
Otherwise get your feet wet with an amp6.... easy (ish) to solder.
But dont forget that you have to buy a soldering iron... solder pump... flux etc.
You're not going to get the naked PCB from anywhere so don't bother looking for the other parts.

AM6... that's my recomendation.
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OK Panno got there first....
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Old 14th December 2007, 08:20 PM   #6
JeremyB is offline JeremyB  United States
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Thanks guys.. i think i am leaning towards the amp6.. i can get my hands on the soldering things.. so thats not a cost to me.. i think my biggest issue is that there is not a "kit" that has everything.. i suppose in this day and age, people are tweaking and changing everything. I will look into getting a different transformer.. one that has a bit more.. umpffff. any suggestions? i would love to hear everyones opinion on this.. so please.. keep the info coming.
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Old 14th December 2007, 09:39 PM   #7
cuibono is offline cuibono  United States
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Hmmm, the amp6 website doesn't give a VA or current rating for the transformer, saying only 12 to 15Vac. They do for the Amp6 Basic, saying a 35W SMPS...

Guessing the wattage, these might work, from digikey:

237-1283-ND

595-1181-ND

Those two are 14V at 1.8A and 12V at 3A (25VA and 36VA, $16 an $17 each). I would probably go with the latter.
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Old 14th December 2007, 11:02 PM   #8
JeremyB is offline JeremyB  United States
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ok.. thanks.. so nobody laugh please... but how am i supposed to get power to the amp? i know it says to "add a transformer".. but where does this go? i have seen plug in transformers.. that plug into the wall... maybe i am in over my head.. maybe i should wait til my amp gets here.. i just want to be prepared..

help.
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Old 15th December 2007, 01:42 AM   #9
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You could run down to NPS(around Redwood Rd and California Ave). I have seen many surplus power supplies for $5 or less that would be worthwhile to have for testing at least and you may get enough from your amps with these to make them permanent.
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Old 15th December 2007, 01:44 PM   #10
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Quote:
Originally posted by JeremyB
ok.. thanks.. so nobody laugh please... but how am i supposed to get power to the amp? i know it says to "add a transformer".. but where does this go? i have seen plug in transformers.. that plug into the wall... maybe i am in over my head.. maybe i should wait til my amp gets here.. i just want to be prepared..

help.
Which one did you go for? AMP6 or Basic?
You can do one of two things.....

Get a complete 12V>14V PSU, a switch mode or linear power supply that you connect without bothering with the regulator section of the amp6 (like you said; that plug in the wall)

or

you need a trannie like cuibono is talking about above, this steps the mains voltage down to something nearer the amps requirement then the regulator section of the amp6 kit does the rest.

hope that helps.... go for the 1st option and work on the other later...
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