$175 Class D amp--120 wpc

tubesurf · « **Reply #2320 on:** 25 Dec 2010, 08:46 am »

Quote from: Nick77 on 13 Dec 2010, 04:11 pm

I am running 60kuf with no problems on the stock PS with Panasonic 10k TSHA caps, i think Wushiliu went even higher. I ran 40k for a while and bumped up to 60k with nice results, dont know if there is any benifit to going higher.

Digikey has these back in stock for a killer price.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P7492-ND

Aren't these caps rated too low for voltage? These are 63V - aren't the stock caps 80V?

THanks,

Lang

HT cOz · « **Reply #2321 on:** 25 Dec 2010, 04:16 pm »

Donc

I'm in the Houston area and think I could help you out in a few weeks after I finish up all my current projects. My solding skills have been getting better lately.

I soldered an in wall speaker while standing on a box holding the speaker in one hand, gun in the other, and solder in the speaker hand. It was a real Cat in the Hat moment. Lol

wushuliu · « **Reply #2322 on:** 25 Dec 2010, 07:51 pm »

Quote from: tubesurf on 25 Dec 2010, 08:46 am

Aren't these caps rated too low for voltage? These are 63V - aren't the stock caps 80V?

THanks,

Lang

224 amps you can go as low as 50v;254 amps 63v is fine. Also I think the connexelectronic amps are much better power supply and make for a smaller and even easier to build amp.

nodiak · « **Reply #2323 on:** 25 Dec 2010, 10:20 pm »

Been rereading this thread for info, have a cda254.
I just wanted to link to an interesting thread that worked out a tube preamp impedance mismatch problem for someone with a cda254 and a PAS pre with Van Alstine mods. I notice Wushuliu is on that thread so this info may not be new here.
After reading Flounders post #2107 in this thread the symptoms seem similar.
Start on post #32. Easy read.

http://techtalk.parts-express.com/showthread.php?t=218374&page=2

Discussions like this are helpful. I'm going to be careful with preamp or buffer matching. I only had a NAD 1700 pre for awhile and it just sounded muffled. Working on Pass B1 soon as possible, and considering the Dodd buffer too. Seems they both mate well with cda254 at least.

pelliott321 · « **Reply #2324 on:** 29 Dec 2010, 07:31 pm »

thanks My CDA 254 went back to tom for a gain change and it came back much better but still not up to par to what i am now using. I have ordered parts for a beefier PS based on whats on the parts express forum so we will see if the bigger caps and better diodes help

toxteth ogrady · « **Reply #2325 on:** 1 Jan 2011, 02:31 am »

I'm at the point where I'd like to upgrade the power supply on my sds-258. The only decent quality caps I can find in a larger value that will fit the board are Nichicon KG 6800uf 80v. Not much of an increase in capacitance but I'm willing to try them just to see if there's a difference between the basic and premium Nichicon caps. As an alternative I could just swap the whole board for one of the Connex boards but I'm not sold on that.

Is anyone aware of any other plug and play option out there for the power supply? Seems like an excellent opportunity for one of the commercial modder's on this site to step forward with a better solution.

wushuliu · « **Reply #2326 on:** 1 Jan 2011, 07:47 am »

Quote from: toxteth ogrady on 1 Jan 2011, 02:31 am

I'm at the point where I'd like to upgrade the power supply on my sds-258. The only decent quality caps I can find in a larger value that will fit the board are Nichicon KG 6800uf 80v. Not much of an increase in capacitance but I'm willing to try them just to see if there's a difference between the basic and premium Nichicon caps. As an alternative I could just swap the whole board for one of the Connex boards but I'm not sold on that.

Is anyone aware of any other plug and play option out there for the power supply? Seems like an excellent opportunity for one of the commercial modder's on this site to step forward with a better solution.

Just my .02 but I do think the Connex SMPS500R performs head and shoulders above the PS setups I had before, and it's pretty much plug and play to boot. Terrific bass control. Same size as the amp board, too. Certainly lighter (and cheaper) than the monster toroid and premium caps you'd probably have to buy if you want to really step up your game. Win-win. I know someone was asking about using a Paul Hynes PS in his forum, so that's a possibility. But again, not cheap I'm sure...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/118

soundnoob · « **Reply #2327 on:** 1 Jan 2011, 01:15 pm »

I have a SDS-254 and eventually plan to add another 254 and a 258 for a 5.1 setup. Would you guys recommend getting a large transformer or changing the power supply to something like the Connex? how much power would i need?

Thanks!

Nick77 · « **Reply #2328 on:** 1 Jan 2011, 01:50 pm »

I dont know where on the scale of performance the Panasonic TSHA's are, but they did yield much better dynamics and detail. They are available in 10k uf and fit the stock supply just fine, i have 60k uf and no regrets.

nodiak · « **Reply #2329 on:** 1 Jan 2011, 03:43 pm »

On the subject of increasing power supply, I'm intrigued by Gary Dodds post #65 in "monoblocks?" thread on GR Research forum. 800va transformer with 68,000 uf on each side, for his CDA254.

http://www.audiocircle.com/index.php?topic=84285.msg818985#msg818985

rjyap · « **Reply #2330 on:** 1 Jan 2011, 10:30 pm »

Quote from: wushuliu on 1 Jan 2011, 07:47 am

Just my .02 but I do think the Connex SMPS500R performs head and shoulders above the PS setups I had before, and it's pretty much plug and play to boot. Terrific bass control. Same size as the amp board, too. Certainly lighter (and cheaper) than the monster toroid and premium caps you'd probably have to buy if you want to really step up your game. Win-win. I know someone was asking about using a Paul Hynes PS in his forum, so that's a possibility. But again, not cheap I'm sure...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/118

Hi, can you kindly post your connection from SMPS to the ClassD Amp board? I'm thinking to build an 8 channel power amp with Connexelectronic 2000w SPMS with 2 x SDS-258 (for LCR) + 2 x CDA-258 (for 4 surround speakers). If I'm not wrong, both board should be running at 70v.

HT cOz · « **Reply #2331 on:** 1 Jan 2011, 11:44 pm »

8ch amp with 4 x CDA258 and a 2000w power supply would be awesome. Can the 2000w supply power 4 boards.

avionic · « **Reply #2332 on:** 2 Jan 2011, 01:38 am »

Pinout for the smps 500r. Someone pm'd me about this a while back and I couldn't get it to load. Works now

Barry_NJ · « **Reply #2333 on:** 2 Jan 2011, 03:01 am »

Quote from: wushuliu on 1 Jan 2011, 07:47 am

Just my .02 but I do think the Connex SMPS500R performs head and shoulders above the PS setups I had before, and it's pretty much plug and play to boot. Terrific bass control. Same size as the amp board, too. Certainly lighter (and cheaper) than the monster toroid and premium caps you'd probably have to buy if you want to really step up your game. Win-win. I know someone was asking about using a Paul Hynes PS in his forum, so that's a possibility. But again, not cheap I'm sure...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/118

That board is rated at +-54v which is ideal for the Class-D 254 boards, but the 258 boards need +-60 to 70.
The only SMPS Connex solution that offers that much voltage is quite pricey...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/120?osCsid=3kkel2uoqfdsc7r28v54p69fe7

P.S. further poking around turned up this option, at a more affordable price, but it seems to be at the low end of the required voltage or just over max recomended...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/124?osCsid=esalb5d1m7s390jauaqo28pvh5

wushuliu · « **Reply #2334 on:** 2 Jan 2011, 07:19 pm »

Quote from: Barry_NJ on 2 Jan 2011, 03:01 am

That board is rated at +-54v which is ideal for the Class-D 254 boards, but the 258 boards need +-60 to 70.
The only SMPS Connex solution that offers that much voltage is quite pricey...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/120?osCsid=3kkel2uoqfdsc7r28v54p69fe7

P.S. further poking around turned up this option, at a more affordable price, but it seems to be at the low end of the required voltage or just over max recomended...

http://connexelectronic.com/product_info.php/cPath/25_46/products_id/124?osCsid=esalb5d1m7s390jauaqo28pvh5

Cristi at Connex should be able to modify the voltage for the latter upon request. The 500R has that +/-10% range, so it may be worthwhile to ask if it can be set to 60v or so for that as well...

rjyap · « **Reply #2335 on:** 3 Jan 2011, 03:20 pm »

Quote from: HT cOz on 1 Jan 2011, 11:44 pm

8ch amp with 4 x CDA258 and a 2000w power supply would be awesome. Can the 2000w supply power 4 boards.

I check with Tom and he said no problem running 4 boards from a 2000w power supply. The voltage requirement recommended is 68v for CDA-258 and SDS-258.

toxteth ogrady · « **Reply #2336 on:** 3 Jan 2011, 07:21 pm »

I find it utterly ridiculous that ebay is the only place to source 35mm wide 10000uf capacitors in the required 80v for my sds-258

. I have scoured every possible source with no luck. It looks like the 80v Nichicon KG 6800uf from partsconnexion is the best you can do with the power supply board from classdaudio unless you want to take your chances with what are more than likely fake capacitors on ebay.

Nick77 · « **Reply #2337 on:** 3 Jan 2011, 07:32 pm »

Quote from: toxteth ogrady on 3 Jan 2011, 07:21 pm

I find it utterly ridiculous that ebay is the only place to source 35mm wide 10000uf capacitors in the required 80v for my sds-258 . I have scoured every possible source with no luck. It looks like the 80v Nichicon KG 6800uf from partsconnexion is the best you can do with the power supply board from classdaudio unless you want to take your chances with what are more than likely fake capacitors on ebay.

I talked to Tom and he said minium of 63v is okay, that is what several of us are running no problems. The TSHA's are available from digikey.

Opps.......... sold out again, they go like hot cakes at only $6.85.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P7492-ND

toxteth ogrady · « **Reply #2338 on:** 4 Jan 2011, 01:43 am »

Thanks Nick. Did Tom say 63v capacitors would work well specifically with the 258 or was he speaking about the 254? 10000uf 63v snap-ins with a 35mm diameter will be much easier to find.

Forst · « **Reply #2339 on:** 4 Jan 2011, 02:53 am »

Hello toxteth ogrady,

While I don't own a Class D Audio amp (yet I hope to some day), I've been looking closely at their offerings and it seems that it would be relatively easy to add additional capacitance to the PSU by adding external pairs of caps to either the DC output terminals of the PSU board or the DC input terminals of the Amp PCB. Of course this approach assumes you have room within your chassis to accommodate additional components.