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Chip Amps Amplifiers based on integrated circuits

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Old 16th March 2013, 12:33 PM   #31
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Yes, using a power transformer/rectifier/diode bridge. Just a junkbox supply that I had available. You could use a laptop brick switchmode supply with your amp no problem.
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Old 16th March 2013, 12:40 PM   #32
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Quote:
Originally Posted by Mark2727 View Post
Can you school me on amperage? The more the better? Or, exactly how do I choose the amp rating of the power supply.
The amperage could depend on your speaker impedance or could depend on the chip. If you have 8R speakers then the maximum current you could run through them from the chip would be 1.5A from 12V, even assuming that the chip could swing to the rails (which none can to my knowledge). So then 3A would be more than adequate as a supply. If your speakers are lower than 8R then the chip limits at 2A per channel, so 4A is the upper limit of what you'd need.

What determines SQ is the impedance of the supply. Get some local decoupling in place on the board - I use paralleled 10uF 1206 25V ceramics and they give a ridiculously clean supply at high freqs, far and away better than anything else. Add lots of paralleled 2,200uF electrolytics (as many as you dare, I've gone up to a hundred or so on my chipamp) for the low freq performance
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Old 16th March 2013, 12:52 PM   #33
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Quote:
Originally Posted by Saturnus View Post
The reason I stress that efficiency is 4 times worse than a comparable class D amp is that many of such amps are sold for the 12V portable market. And here it will have a huge impact on battery life is it's one or the other type. So the $6 amp here could very fast end up costing much more than a $20 class D amp because you need a 4 times larger battery to get the same run time.

Btw, here a big meal at McD/BK is $15. Lots of even rather good class D amps fall into the "less than a fast food meal" category.

Saturnus,

Oh, I see about the efficiency. Thanks for the education. I'm just learning.

I remember food being quite expensive in Copenhagen when I was lucky enough to visit many years ago. I loved it there nonetheless. There were NO McDonalds or Burger Kings then. (And that's one of the things that made it so nice!)

Everyone,
I'd be interested in knowing your particular favorite class D or chip amp --- regardless of cost.

I think so far mine are (no particular order or classification):
Winsome Mouse
Jerry's Electronics Amp
Sure Electronics TK-2050 (They list it as 2X100 Watt)

These ones, to me, have an excellent tone and don't make you want to go screaming from the room and grab one of your tube amps.

Mark
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Old 16th March 2013, 12:57 PM   #34
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Quote:
Originally Posted by Mark2727 View Post
I'd be interested in knowing your particular favorite class D or chip amp --- regardless of cost.
TDA8566 (about $6 from Mouser for the chip) - details on my blog. Sounds like a tube amp, even better than a tube amp in the bass with decent power supply.

http://www.diyaudio.com/forums/blogs...d-project.html . Since I wrote this I've found that the PSU on this schematic wasn't extreme enough so I'll be putting up another post in a while to explain how I've improved it.
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Last edited by abraxalito; 16th March 2013 at 01:14 PM.
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Old 16th March 2013, 01:04 PM   #35
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Abrax,

Please point us towards your blog. I'd be interested to look at it.

Mark
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Old 16th March 2013, 01:30 PM   #36
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Quote:
Originally Posted by Mark2727 View Post
Please point us towards your blog. I'd be interested to look at it.
There's a link that says: Blog entries under his location.

My favorite class D amp is the amp6b from 41hz.com. It's a kit so you have to solder it together yourself, and there are a few SMD components but it's really easy none-the-less. It's also available in assembled version though. In either case you have to supply your own case and so on.

The reason it's my favorite is that it's a fantastic all-rounder. It might not do everything the absolute best when compared to real multi-$1000 hi-end amps but it's always better in some area.

The other point is that it uses almost no power. My entire system (which is just the amp6b and a USB DAC) uses less than 1W on average, so my power supply is a 14W solar panel, a LiFePO4 battery and a 1F cap. It's run non-stop on that for 5 years.

Naturally, using an amp that only gives 8W per channel in 8 ohms requires a highly sensitive speaker like my Fostex FE206 BLHs but that would be no different for a class A solid state or tube amp (both of which I've had in the past).

Last edited by Saturnus; 16th March 2013 at 01:33 PM.
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Old 16th March 2013, 02:02 PM   #37
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Mark, yes it is an IMPORTANT DISTINCTION... its important for people other than yourself so they can find it in the correct section for time to come, should they know what the sections mean; rather than adding to the refuse of completely useless threads people start every day...

this is a communal forum, not your personal technology oracle. efficiency makes the difference whether the heatsink is under dimensioned and whether the amp as supplied will fry eggs before putting anything close to the power it claims.

from where i'm standing its you on the soap box.

this is a technical forum, presumably thats why you came here in the first place, it is what it is and people will correct misinformation when they see it. this is a good thing IMO, though i'm noticing more and more people getting annoyed by people setting things straight, preferring anecdotes to factual accounts etc.

$6 or $100 makes little difference to me if i'm going to bother putting in the time to build something. if its a piece of crap that doesnt do what it claims, its a waste of $6 and time, not a bargain.

Quote:
Originally Posted by Mark2727 View Post
WHO CARES whether this or that amp is a Class D or a Chip Amp or whether this is "only" X percent efficient? Or whether it has GOT to be trash since the white paper doesn't show this or that certain specification. And if the post should fall into a certain category under a forum?

Several of you guys have got the point that the two amps pointed out here are less than a so-called "lunch" at a fast food joint.

As for the others, like so often on forums, they seem to be dwelling on minutiae and proving how "smart" they are. OK fine, you are smarter than I. Happy now?

Get over yourselves, build something or at least assemble it. And HAVE FUN!

......

It's not a soapbox for the intellectually "superior" to lord over the rest of us.

Mark

Last edited by qusp; 16th March 2013 at 02:13 PM. Reason: cut quote size
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Old 16th March 2013, 03:53 PM   #38
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I know you posted this to alert people to a deal as well, thats cool, but dont make it personal when things are corrected, thats just part of the organic nature of the forum.
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Old 17th March 2013, 02:44 AM   #39
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Default 41hz.com

[QUOTE=Saturnus;3413337]There's a link that says: Blog entries under his location.

My favorite class D amp is the amp6b from 41hz.com.


Saturnus,

You know, I see so many people recommending those amps from 41hz!

Enclosures are never a problem for me. I am a woodworker. Just finished an enclosure for my Sure today. I am always inspired by the design and color schemes of your country and of Scandinavia in general. The amp I worked on today is maple with a "spring green" top, and faux aluminum feet. I think it has a fresh, clean look to it.

Using almost no power is admirable. That's what interests me about these chip and class D amps. And the size. And of course they are getting better sonically it seems all the time.

Mark
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Old 29th March 2013, 12:15 PM   #40
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Default Here from China

The little $6 amp arrived, but not the 12VDC power supply. When that comes I'll post again.

I've confirmed with the seller that the photo is incorrect: It shows the red input as left, and he indicated yes, it's actually the right input.

Mark
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