Modified ColdAMP SPS80

la1209 · 24th July 2006, 11:03 AM

Hi! Everybody, I'm now using a modified ColdAMP SPS80 to drive 2-channel UcD400AD, and the result is positive!! Transparent, deep bass and sweet sound that I can found after modification done!

ColdAMP SPS80

Layout

Modified the output cap to 4700uF/63V Jensen 4-poles Audio Grade E.Cap

Custom made back panel, WBT 720.12 signature series used

Jensen 1.0mm, 1.5mm Silver wire used for wiring

WBT 4% Silver Solder used

Jensen 4-poles E.Cap

The centre one is the Class-D power amp, Clone ProAc R3.8 and LCY Ribbon super tweeter!!

Now, I'm confusing the connection of the Jensen 4-poles E.Cap.
I found that in the Jensen's Web site, different kinds of connections of the 4-poles E.Cap, anyone know that which connecting method is the best?
My connection now is only parallel two 4700uF/63V in one side, + IN connect to the + side of C6/C7¡A- IN connect to the - side of C6/C7, + OUT and - OUT connect to the other cap's + IN and - IN, and finally the + OUT and - OUT connect to the + side and - side of C8/C9.
Is a best result given out in this kind of connections??

Thanks for any comment!!

Best Regards
Kenneth Lau

classd4sure · 24th July 2006, 11:47 AM

Hi,

Nice layout. I like that case, alot, where'd you get it? Solide silver wire?? Whate gauge is used for the supply?

It looks like there might be additional linear regulators for an aux supply on that... If so I'd put them to use!

The way you have them adds the ESR. Wire your Jensen's like so:

ackcheng · 24th July 2006, 03:48 PM

looks really nice! Congrats!

What was it like before the modification? Did you compare it with the linear PS?

Eva · 24th July 2006, 04:00 PM

Placing these capacitors away from their mounting locations and attached with long and spaced wires is a great mistake, despite the placebo-inducting fancy look.

fokker · 24th July 2006, 04:03 PM

I would agree with eva on that. tremendous amount of pulsing current going through those long and skinny wires.

ackcheng · 24th July 2006, 04:04 PM

probably impossible to put those caps in the limited space though!

Eva · 24th July 2006, 04:28 PM

It's not only pulsating current, it's tht any LC output filter is ruined by adding series inductance to the capacitor, particularly with a wire-like antenna.

classd4sure · 24th July 2006, 04:33 PM

More so because they're four poles and I doubt the possibility of mounting them on the PCB at all.

Placebo aside, these caps sound incredible, to the extent it's likely worth a bit of increased EMI. Still, I'd at least twist the wires and it might do to try a ferrite clip or other common mode choke right up against the PCB, in the least.

I'd twist all the other wires too.

Now that I look at it more, I really have no idea why the T networks are jumping back to the PCB. Can you not just // them for each rail and then go straight to the amps off the caps in the most direct route possible?

Could probably also put the caps in front of the supply and shorten the wires all the way around, from the supply to the caps and from caps to the modules.

ackcheng · 25th July 2006, 02:01 AM

Isn't the caps within the feedback loop?

la1209 · 26th July 2006, 12:16 PM

Quote:

Originally posted by classd4sure
Hi,

Nice layout. I like that case, alot, where'd you get it? Solide silver wire?? Whate gauge is used for the supply?

It looks like there might be additional linear regulators for an aux supply on that... If so I'd put them to use!

The way you have them adds the ESR. Wire your Jensen's like so:

But the output of the Coldamp SPS80 is +VCC GND -VSS, how can I connect the T-Network like your attachment??

24th July 2006, 11:03 AM	#1
la1209 diyAudio Member Join Date: May 2006	Modified ColdAMP SPS80 Hi! Everybody, I'm now using a modified ColdAMP SPS80 to drive 2-channel UcD400AD, and the result is positive!! Transparent, deep bass and sweet sound that I can found after modification done! ColdAMP SPS80 Layout Modified the output cap to 4700uF/63V Jensen 4-poles Audio Grade E.Cap Custom made back panel, WBT 720.12 signature series used Jensen 1.0mm, 1.5mm Silver wire used for wiring WBT 4% Silver Solder used Jensen 4-poles E.Cap The centre one is the Class-D power amp, Clone ProAc R3.8 and LCY Ribbon super tweeter!! Now, I'm confusing the connection of the Jensen 4-poles E.Cap. I found that in the Jensen's Web site, different kinds of connections of the 4-poles E.Cap, anyone know that which connecting method is the best? My connection now is only parallel two 4700uF/63V in one side, + IN connect to the + side of C6/C7¡A- IN connect to the - side of C6/C7, + OUT and - OUT connect to the other cap's + IN and - IN, and finally the + OUT and - OUT connect to the + side and - side of C8/C9. Is a best result given out in this kind of connections?? Thanks for any comment!! Best Regards Kenneth Lau

24th July 2006, 04:00 PM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Placing these capacitors away from their mounting locations and attached with long and spaced wires is a great mistake, despite the placebo-inducting fancy look. __________________ I use to feel like the small child in The Emperor's New Clothes tale

24th July 2006, 04:28 PM	#7
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	It's not only pulsating current, it's tht any LC output filter is ruined by adding series inductance to the capacitor, particularly with a wire-like antenna. __________________ I use to feel like the small child in The Emperor's New Clothes tale

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
testing of SPS80 SMPS	ackcheng	Class D	32	23rd August 2011 07:31 AM
FS: COLDAMP one SPS80 power supply & two BP4078 modules in MK12 Case	BongFish	Swap Meet	2	18th March 2009 03:17 PM
UCD700 and SPS80 HV - noise problem	Fabian	Class D	7	25th November 2007 08:43 AM
UCD 400 and Coldamp SPS80 SMPS	ptwining	Class D	1	22nd September 2007 04:43 AM
Potentially WTB Coldamp SPS30/SPS80	DonoMan	Swap Meet	0	2nd June 2007 06:04 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

24th July 2006, 03:48 PM	#3
ackcheng diyAudio Member Join Date: Dec 2003 Location: hong Kong	looks really nice! Congrats! What was it like before the modification? Did you compare it with the linear PS?

24th July 2006, 04:03 PM	#5
fokker diyAudio Member Join Date: Jul 2006	I would agree with eva on that. tremendous amount of pulsing current going through those long and skinny wires.

24th July 2006, 04:04 PM	#6
ackcheng diyAudio Member Join Date: Dec 2003 Location: hong Kong	probably impossible to put those caps in the limited space though!

24th July 2006, 04:33 PM	#8
classd4sure Account Disabled Join Date: Feb 2004	More so because they're four poles and I doubt the possibility of mounting them on the PCB at all. Placebo aside, these caps sound incredible, to the extent it's likely worth a bit of increased EMI. Still, I'd at least twist the wires and it might do to try a ferrite clip or other common mode choke right up against the PCB, in the least. I'd twist all the other wires too. Now that I look at it more, I really have no idea why the T networks are jumping back to the PCB. Can you not just // them for each rail and then go straight to the amps off the caps in the most direct route possible? Could probably also put the caps in front of the supply and shorten the wires all the way around, from the supply to the caps and from caps to the modules.

25th July 2006, 02:01 AM	#9
ackcheng diyAudio Member Join Date: Dec 2003 Location: hong Kong	Isn't the caps within the feedback loop?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read