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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th August 2007, 02:48 PM   #1
gychang is offline gychang  United States
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Default this work for original SI?

I like to try SI but without hassel of trying to change batteries all the time. I also don't want wallwart.

Can I use this? Regulated 13.8VDC, with continuous 3A, with surge of 5A.

http://www.mcminone.com/product.asp?...5Fid=72%2D8140

thanks,

gychang
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Old 5th August 2007, 03:17 PM   #2
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It "will" work, but it's big, ugly, and linear.

Do a search on ebay for 14V adapter. It will bring up quite a few LCD monitor switching supplies, most of which are 3A or more. This is what I use on my "T-Amps" . Of course there is a plethra of other switching supplies out there you can find for cheap also.

I guess the real question is "Linear" or "Switching"?
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Old 5th August 2007, 03:36 PM   #3
gychang is offline gychang  United States
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Quote:
Originally posted by theAnonymous1
It "will" work, but it's big, ugly, and linear.

Do a search on ebay for 14V adapter. It will bring up quite a few LCD monitor switching supplies, most of which are 3A or more. This is what I use on my "T-Amps" . Of course there is a plethra of other switching supplies out there you can find for cheap also.

I guess the real question is "Linear" or "Switching"?

as u can gather I am new to this electronic stuff. Which is better "Linear" or "Switching", I am not sure what the Linear and Switching refers to...

The model above is <$25, for variety of reasons I like to avoid wallwart style (may want to "upgrade" from SI later).

I will look around the ebay as u suggested.

thanks,

gychang
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Old 5th August 2007, 04:06 PM   #4
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A "wallwart" is usually just a very small transformer with rectifiers and smoothing caps, no regulation. Not very ideal.

The linear supply you posted is very inefficient and heavy and "wastes" the unneeded power from the transformer as heat.

A switching supply works very similarly to the SI amp itself. They usually have >80% efficiency and are very lightweight compared to a linear supply. Many people consider a switching supply an ideal power source for a switching amplifier.

I'm sure someone better at explaining things will chime in.
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Old 5th August 2007, 04:14 PM   #5
gychang is offline gychang  United States
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Quote:
Originally posted by theAnonymous1


A switching supply works very similarly to the SI amp itself. They usually have >80% efficiency and are very lightweight compared to a linear supply. Many people consider a switching supply an ideal power source for a switching amplifier.

that's very helpful, so I will look around the switching PSU, particularly interested if voltage/amp can be variable (plan to upgrade later time to another t-amp).

1. Anyone know a "cost-effective" (cheap), switching PSU, perhaps with adjustable output?
2. If not, would really appreciate switching PSU that will work with SI.

thanks,

gychang
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Old 5th August 2007, 04:40 PM   #6
preiter is offline preiter  United States
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Here's a nice power supply for a T-Amp, cheap too.

http://www.bgmicro.com/index.asp?Pag...D&ProdID=12293

12V, 3.3A, regulated SMPS.
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Old 5th August 2007, 06:06 PM   #7
luka is offline luka  Slovenia
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Hi

Or you can make BIG LINEAR 13.8v/20A supply like I did
I would go for switching supply, 100%
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Old 6th August 2007, 09:05 AM   #8
Pano is offline Pano  United States
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Quote:
Originally posted by preiter
Here's a nice power supply for a T-Amp, cheap too.
http://www.bgmicro.com/index.asp?Pag...D&ProdID=12293
Yes, that would be a very good start. I have not heard that supply, but it looks similar to the Trends supply. It's a good and cheap place to start. Later you can look for upgrades and you will have something to compare them to.
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Old 6th August 2007, 09:46 AM   #9
mustik is offline mustik  Finland
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So, switched is better than linear? Wikipedia claims that cheap switching psus may generate electromagnetic interfence, but otherwise switched seems to be better suited for this purpose. So, could EMI really be an issue?
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Old 6th August 2007, 05:32 PM   #10
Pano is offline Pano  United States
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It's a switching amp. There is EMI a-go-go inside.

One would think that a switch mode supply might sound bad with these amps, but it's just not so. Most of them sound good, some sound very good.

But a good linear supply also works well, and even batteries with caps will sing.

It's an easy modification to play with. If your system is up to it, you will easily here the difference in power supplies. The are, after all, half of amp.
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