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Class D Switching Power Amplifiers and Power D/A conversion

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Old 19th September 2010, 07:43 AM   #771
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Location: Stockport South Australia
Try

modu

I just love their big handles
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Old 19th September 2010, 01:19 PM   #772
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Quote:
Originally Posted by pheonix358 View Post
Try

modu

I just love their big handles
Modu has excellent products but unless you are willing to drill all the necessary front/back panel holes & cutouts yourself, there is an additional 30 Euro price per customized panel. Still their stuff is very beautiful.

I am also looking for the "holy grail" of cases for my amp & preamp. Also a nice "Integrated amp, style case for my soon to come Hifimediy board.
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Old 19th September 2010, 08:32 PM   #773
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An empty HLLY amplifier chassis can be purchased on EBay for $70-$80. It looks classier than your typical DIY project box, and comes with built-in volume knob, power switch, binding posts, etc. At roughly 12" x 7" x 2.5", it's big enough (barely) for a single Meanwell power supply and at least one of Hifimediy's amplifiers. You might even be able to squeeze in a DAC board if you're creative.

DIYers with multiple T3 boards will need something larger, but casual builders with less ambitious goals should take a look.
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Old 19th September 2010, 08:41 PM   #774
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You can get a similar or bigger chassis from Modushop with shipping for around the same. For a 230x230x40mm it was going to be like 85 shipped. That's the model with teh 10mm aluminum front.
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Old 19th September 2010, 09:36 PM   #775
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Originally Posted by Dougie085 View Post
You can get a similar or bigger chassis from Modushop with shipping for around the same. For a 230x230x40mm it was going to be like 85 shipped. That's the model with teh 10mm aluminum front.
Unfortunately, most Meanwell power supplies greater than 150 watts are at least 50mm high, while the Modu case is only 40mm high. You could try removing part or all of the power supply's metal enclosure to make it shorter, but doing so could cause interference or safety issues.

I think Meanwell just started selling a low-profile 1U 300w power supply, but it's expensive and might also be too big for the Modu case.
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Old 19th September 2010, 10:28 PM   #776
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Well they do have the 2U version for a few bucks more. Could get something smaller that'll fit it for probably around the same price.
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Old 20th September 2010, 12:34 AM   #777
alkasar is offline alkasar  France
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I have this box from a previous project. Its a very good looking and well manufactured box.
Be aware that internal size is 210x230x80 (WxDxH). It is problematic to fit meanwell + amp v2 bord in this box. I could not yet figure out how to fit both without removing the pot.
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Old 20th September 2010, 07:55 AM   #778
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I think I need a case a bit bigger than what is described here. I'm looking at Slim 02/350 2U 10mm BLACK at Modu.it. It has the following dimensions:

Format: 2 Unit
1x Frontal Panel in alluminium 10mm oxidized black 450 mm
1x Back Panel in alluminium 3 mm oxidized black
2x Flanks in section of alluminium10 mm oxidized black
2x Covers in metal painted black anti-scratch
Width: Structure 435 mm rack 415 mm internal
Depth: 350 mm Height: 80 mm
Weight: 4,9 KG.


As mentioned before I have two 400W SMPS and they was a little bit bigger than I thought.
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Old 20th September 2010, 08:11 AM   #779
TCx is offline TCx  Czech Republic
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I have bought the same or very similar aluminum case as Hlly uses for their TAMP-90 from this website for 30 USD.
XINLI LAI's store Small Orders Online Store

It includes preinstalled speaker and RCA terminals, mains socket, volume button. For extra $1 I got preinstalled backlit power button.
They can also custom laser mark the front panel free of charge. I took advantage of this offer but I do not recommend you to do so because I sent them a pdf file with my logo and they laser marked the panel using the same word but very different big basic font. So it looks ugly.

They also produce 200+W SMPS (not exposed at their webisite) with following parameters:
1.Input:90-265Vac 50 or 60 Hz
2.Output:30V /7A dc output
3.Ripple:<100mV
4.dimensions:100mm(w)*100mm(l)*35mm(h)

Click the image to open in full size.

This one costs 25 USD. I have not tried this SMPS but am going to order one.
Maybe they can modify its output voltage to 50V.

Earlier I ordered the 150W SMPS which is presented at their website. It costs only 10 USD!!! I simply modified its output voltage to 30V by change of one SMD resistor, according to their instructions. This SMPS works fine, the only problem I have with it is that it started to produce a high pitch noise / tone after some time of use. I mean mechanically - it is probably its transformer vibrating.

I can't imagine how they can produce and sell a SMPS so cheaply, at $10! I was quite affraid of its reliability (when it is so cheap) but it seems to work fine. The "only" problem is the high pitch tone it produces. It can't be heard when you play music but it is annoying in silence.
Hope the other SMPS, the $25 one, is OK in this and all other aspects.

Another option is to use one of the SMPS' offered by connexelectronic.com. They are more expensive but of very good quality. And their dimmensions are suitable for the chasis mentioned above.
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Old 20th September 2010, 12:14 PM   #780
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Originally Posted by TCx View Post
The "only" problem is the high pitch tone it produces. It can't be heard when you play music but it is annoying in silence.
I thought about trying a frameless power supply, but I was concerned about potential noise issues. Has anyone had a successful experience using an open frame power supply (Meanwell or otherwise) to power their amplifier, and if so what brand?
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