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).
http://tdood.weebly.com/uploads/2/3/3/5/2335145/4720493_orig.jpg?0
http://tdood.weebly.com/uploads/2/3/3/5/2335145/4536060_orig.jpg?0
http://tdood.weebly.com/uploads/2/3/3/5/2335145/8585585_orig.jpg?0
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).
http://tdood.weebly.com/uploads/2/3/3/5/2335145/4720493_orig.jpg?0
http://tdood.weebly.com/uploads/2/3/3/5/2335145/4536060_orig.jpg?0
http://tdood.weebly.com/uploads/2/3/3/5/2335145/8585585_orig.jpg?0
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_images/1293792055_su83/hc130823618242.jpg
The original end panels were clip in plastic. The new ones are painted MDF.
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_images/1293792055_su83/hc130823618242.jpg
The original end panels were clip in plastic. The new ones are painted MDF.
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.
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
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
Attachments
TPA3122D2 on a slab of soft maple
An externally hosted image should be here but it was not working when we last tested it.
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.
http://www.diyaudio.com/forums/multi-way/167960-inexpensive-gedlee-bouska-waveguide-tweeter-midbass-idea-5.html
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
http://www.diyaudio.com/forums/multi-way/167960-inexpensive-gedlee-bouska-waveguide-tweeter-midbass-idea-5.html
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
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I agree. But I wanted to simplify audio things. I did a quick off the speaker then on the speaker by hanging. Very close sound to my ears so I hung them up.
Putting xovers on the floor is better than hard mounting them on or in speakers. Hanging them is about as good as having them on the floor. And they are hidden from view!
When building these speakers I did FR using inexpensive resistors and solen caps. When I finalized the xover I bought some Mills Rs and put in some teflon caps in a few places for solens. I could not measure a difference with my FR. My ears could hear the diff and my girl friend asked, out of the blue, "Wow. You really improved them."
I also don't think measuring FR hung vs unhung would show up in a FR. I don't think vibrations or noise affect FR much.
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Great design and you touch a interesting theme: glass enclosures.
Like big ships in small bottles... anyone?
Stereo amplifier Hypex with smps in 1U rack.
Beautifully and skillfully done. Makes me want to try a Hypex. Lot of emphasis on the power supply, which is half the equation anyways. What are the specs or models for this setup?
I'll join the gallery too, although I don't have anything yet... This is a four channel NewClassD amp to be driven with an active crossover. It's got 1300VA toroids and separate cap banks for each amp, 15000 uF Jensen 4-pole for the mid/high, and 2x 15000 uF for lows. I'll make the case out of 10 mm aluminium, with 3 mm top and bottom. Haven't desided on front design yet.
With a little luck, I'll have it done by Christmas
Now here's a thought. Why not change the design totally. Have the output stage directly fed by the mains power and have transformer fed (1k3KW transformers at 120kHZ have very little iron) loudspeakers with an opto coupled input stage.
Power is no problem.
If it was designed with high voltage MOS FET output transistors it could run nicely from a 440volt 3phase power supply!
I will show you my design when it is built.
