Modified ColdAMP SPS80 - Page 2

classd4sure · 27th July 2006, 12:39 PM

Quote:

Originally posted by la1209

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

Easy enough.

Add another wire.

V+/GND (two twisted wires) and Gnd/-V (two more twisted wires). The output ground formed by the cap common just goes straight to the amp power ground.

I'd put the caps in front of the SMPS in order to them as close as possible, and all wires as short as possible.

la1209 · 27th July 2006, 02:50 PM

Hi! ClassD4sure,

Would you mind to send me the photo of your connection??
I've try to connect the Caps like your suggestion, +Vin GND use a twisted wire connected to C7, and -Vin GND connected to C6, also the OUT+ & OUT - of the Four caps becomes the GND of the output.

But the red LED on after I turned on the main power
Thanks!

classd4sure · 27th July 2006, 04:21 PM

Hi,

A picture would be of little help, if you respected the polarities show in the diagram I gave you it should be OK. Give it a close double check that you didn't reverse one of the rails?

kartino · 28th July 2006, 01:21 AM

Some elco's top side also used as pressure release when explosion occur by overheating. Placing elcos also shall consider to where the direction of explosion.

la1209 · 28th July 2006, 04:11 AM

Quote:

Originally posted by classd4sure
Hi,

A picture would be of little help, if you respected the polarities show in the diagram I gave you it should be OK. Give it a close double check that you didn't reverse one of the rails?

I already check all the polarities, and nothing wrong.
But also fail to power on!
I don't know why?
Could you mind to sen me a pic of the connections of your caps??
Thanks a lot for a kindly help!!

la1209 · 28th July 2006, 05:52 AM

Thanks everyone help!!
My problems already solved, thanks a lot!

ackcheng · 28th July 2006, 05:58 AM

is it better with this new wiring?

KeithC · 28th July 2006, 06:43 AM

Quote:

Originally posted by la1209
Thanks everyone help!!
My problems already solved, thanks a lot!

So what was it then?

la1209 · 28th July 2006, 07:10 AM

Actually, now I connected the Jensen Caps like classd4sure suggestion. For the best performance, we should connect in this way!
And also, I found that the sound becomes more muscial and detail, a possible way to modifiy your SPS80 in a best result.

Now I am using 1.5mm Jensen solid core silver wire for the power paths and 1.0mm for the signal paths. Worderful result that I can found, transperant and powerful!

More, I also setup two set of linear power supply for the input buffer of the UcD400AD

classd4sure · 31st July 2006, 04:58 PM

Good stuff!

Please inform us where you made your error, others who may want to follow might like to know.

It's good that you don't require a picture now because for one thing I dont' have a camera and for another, I'm in the middle of re-wiring my own supply..

Glad the changes paid off for you.

28th July 2006, 01:21 AM	#14
kartino diyAudio Member Join Date: Feb 2005 Location: Gunungkidul Indonesia	Elco's pressure release. Some elco's top side also used as pressure release when explosion occur by overheating. Placing elcos also shall consider to where the direction of explosion.

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27th July 2006, 02:50 PM	#12
la1209 diyAudio Member Join Date: May 2006	Hi! ClassD4sure, Would you mind to send me the photo of your connection?? I've try to connect the Caps like your suggestion, +Vin GND use a twisted wire connected to C7, and -Vin GND connected to C6, also the OUT+ & OUT - of the Four caps becomes the GND of the output. But the red LED on after I turned on the main power Thanks!

27th July 2006, 04:21 PM	#13
classd4sure Account Disabled Join Date: Feb 2004	Hi, A picture would be of little help, if you respected the polarities show in the diagram I gave you it should be OK. Give it a close double check that you didn't reverse one of the rails?

28th July 2006, 05:52 AM	#16
la1209 diyAudio Member Join Date: May 2006	Thanks everyone help!! My problems already solved, thanks a lot!

28th July 2006, 05:58 AM	#17
ackcheng diyAudio Member Join Date: Dec 2003 Location: hong Kong	is it better with this new wiring?

28th July 2006, 07:10 AM	#19
la1209 diyAudio Member Join Date: May 2006	Actually, now I connected the Jensen Caps like classd4sure suggestion. For the best performance, we should connect in this way! And also, I found that the sound becomes more muscial and detail, a possible way to modifiy your SPS80 in a best result. Now I am using 1.5mm Jensen solid core silver wire for the power paths and 1.0mm for the signal paths. Worderful result that I can found, transperant and powerful! More, I also setup two set of linear power supply for the input buffer of the UcD400AD

31st July 2006, 04:58 PM	#20
classd4sure Account Disabled Join Date: Feb 2004	Good stuff! Please inform us where you made your error, others who may want to follow might like to know. It's good that you don't require a picture now because for one thing I dont' have a camera and for another, I'm in the middle of re-wiring my own supply.. Glad the changes paid off for you.