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Old 24th July 2006, 11:03 AM   #1
la1209 is offline la1209  Hong Kong
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Default 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!
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ColdAMP SPS80
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Layout
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Modified the output cap to 4700uF/63V Jensen 4-poles Audio Grade E.Cap
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Custom made back panel, WBT 720.12 signature series used
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Jensen 1.0mm, 1.5mm Silver wire used for wiring
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WBT 4% Silver Solder used
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Jensen 4-poles E.Cap
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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
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Old 24th July 2006, 11:47 AM   #2
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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:
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Old 24th July 2006, 03:48 PM   #3
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looks really nice! Congrats!

What was it like before the modification? Did you compare it with the linear PS?
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Old 24th July 2006, 04:00 PM   #4
Eva is offline Eva  Spain
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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.
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Old 24th July 2006, 04:03 PM   #5
fokker is offline fokker  China
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I would agree with eva on that. tremendous amount of pulsing current going through those long and skinny wires.
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Old 24th July 2006, 04:04 PM   #6
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probably impossible to put those caps in the limited space though!
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Old 24th July 2006, 04:28 PM   #7
Eva is offline Eva  Spain
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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.
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Old 24th July 2006, 04:33 PM   #8
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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.
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Old 25th July 2006, 02:01 AM   #9
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Isn't the caps within the feedback loop?
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Old 26th July 2006, 12:16 PM   #10
la1209 is offline la1209  Hong Kong
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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??
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