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Class D Switching Power Amplifiers and Power D/A conversion

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Old 2nd November 2012, 04:55 PM   #581
tsaelee is offline tsaelee  United States
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Default Long time reader first time poster

Here are couple of Class-T amp I put together - took a while to complete. Nothing too fancy, just couple of piece-together metal/plywood box with Sure TK2050-4x100 Class-T boards.

The one with linear power supply I clobbered together and was surprised it worked. It took me several iterations before settling down. It is just an unregulated supply with hopefully sufficient smoothing caps. The other one is powered with hacked computer power supply - two supplies serially connected together using only the 12-volt lines, yielding 24-volt at, I believe, 15A (i forgot, it has been awhile since I pieced them together).

Click the image to open in full size.

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http://tdood.weebly.com/uploads/2/3/...493_orig.jpg?0

http://tdood.weebly.com/uploads/2/3/...060_orig.jpg?0

http://tdood.weebly.com/uploads/2/3/...585_orig.jpg?0
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Old 3rd November 2012, 07:12 AM   #582
neilmc is offline neilmc  Australia
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Default L15D in UPS case

I've just finished mounting a 2 ch L15D and a Connexelectronic 60v SMPS800RE into an old APC UPS case.

It's a tight fit on the case base plate with the 800W supply. A 500W supply would have been an easy fit. I needed to cut a bit of a recess into one of the end plates to get the screws in the side.

http://i.imgur.com/yaxuW.jpg
Photo Album - Imgur

It started life looking like this

http://www.hafeezcentre.pk/ads_image...0823618242.jpg

The original end panels were clip in plastic. The new ones are painted MDF.
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Old 6th December 2012, 12:53 AM   #583
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Here's the 8 channel build using SDS-258 and CDA-258 completed 3 weeks ago. The SQ is better than XPA-5 it replace. Better separation and detail. SDSf are used to power LCR and CDA for surround. I put 2 Nexus silent 80mm fan on top amp module as it's quite hot. Casing is a hack desktop PC casing.

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Old 12th December 2012, 11:12 PM   #584
redjr is offline redjr  United States
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Hi all,

Here are a few pics of my latest amp. A stereo, class D based on the LJM design, using a SMPS and speaker protection board from Cristi at connexelectronic . Using 72vdc rails for ~200wpc into 8 ohms. Sounds great and is dead silent. I can't audibly detect any hiss, hum or other noise. Presently, I'm testing it (non-critically) with my new Doug Self 2012 preamp I recently completed. With the completion of this project, I now have a nice stackable system using this popular form factor enclosure.

Rick
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Old 12th December 2012, 11:45 PM   #585
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Quote:
Originally Posted by redjr View Post
. A stereo, class D based on the LJM design, using a SMPS and speaker protection board from Cristi at connexelectronic .
Can-you say more about listening impressions ?
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Old 13th December 2012, 05:05 PM   #586
redjr is offline redjr  United States
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Originally Posted by Esperado View Post
Can-you say more about listening impressions ?
Esperado, Since this is a photo thread, please see my comments over here.

Rick
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Old 17th December 2012, 03:18 AM   #587
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Default TPA3122D2 on a slab of soft maple

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Old 22nd December 2012, 01:21 PM   #588
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Billede Olymus 032.jpg

Billede Olymus 031.jpg










Coldamp Sonora 750 with 2200 W Trafo 55 VAC and 140.000 uf. for output stage. Inputstage have its own regulated supply with Duelund noise coil.

Last edited by Erlend Sæterdal; 22nd December 2012 at 01:25 PM.
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Old 23rd December 2012, 12:04 PM   #589
gychang is offline gychang  United States
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Originally Posted by cervelorider View Post
Click the image to open in full size.
like it, very imaginative.
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Old 23rd December 2012, 03:30 PM   #590
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My amp, PS and Xover were all screwed and glued firmly on the double back of my imitation Gedlee Nathans I built. Scroll down to photo near bottom.
An inexpensive Gedlee/Bouska waveguide/tweeter midbass idea.

But I started to change a few xover components and left them hanging before gluing them to the back. The sound was clearer. And then I glued them down and the sound became blurred a bit. Lift them off and hang them: cleaner sound. Same parts.
So I took off and hung all the xover parts. Cleaner, clearer sound.

Next I unmounted and hung the amp and PS. Result: Cleaner clearer sound.

It looks ugly, but its on the back of the speaker where no one can see it.

Class D Audio SDS 258 amp 250w into 8ohms
Class D Audio SDS-258 Amplifier - Class D Audio Amplifiers

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