Build a Hypex, SMPS or trafo?

[hifiking]

I want to build a sub amp with a Hypex UcD700, but the hypex PSU, softstart and trafo is expensive.

Can I use a cheaper SMPS to replace all of those?

Regards Henning Sagen

[eleson]

I'm preparing for a 5 channel hypex amp and will (if nothing strange happens) go for a ( actaully two )SMPS from www.coldamp.com
/Erland

[ssanmor]

We have a small series of special version SPS80, the SPS80HV, with +/-85V output, suitable and more than capable of feeding one or even two UcD700.

[Jan-Peter]

Originally posted by hifiking
I want to build a sub amp with a Hypex UcD700, but the hypex PSU, softstart and trafo is expensive.

Can I use a cheaper SMPS to replace all of those?

Regards Henning Sagen

Indeed they are expenisve, but we use 4x10.000uF 100V Slit Foil capacitors, these SF caps are not standard available in 100V...


And the transformer will give you all voltages what you need. BTW we now have a full potted version transformer with electrostatic shielding between primary and secondary.

Quality has his price, we do not wants to deliver cheap products.

Cheers,

Jan-Peter

[hifiking]

I am a supporter of one brand systems, but the 700 UcD PSU and transformer has 3x the price of the UcD400 PSU and trafo.

I am now going to bridge my two UcD400 modules, but whil this combo play higher than one (at a given volume)?

Why should I not do this? Is there any major drawbacks? This is for a sub.

[Jan-Peter]

Originally posted by hifiking
I am a supporter of one brand systems, but the 700 UcD PSU and transformer has 3x the price of the UcD400 PSU and trafo.

I am now going to bridge my two UcD400 modules, but whil this combo play higher than one (at a given volume)?

Why should I not do this? Is there any major drawbacks? This is for a sub.

Not completly correct, the HG supply cost EUR 165, the UcD 700 Supply cost EUR 225. You can compaire it with the standard power supply!

Thereby the power transformer of the UcD700 is 1300VA or the fully potted audiophile version is 700VA, these cost of course more as the standard 500VA transformer of the UcD400.

With a bridge UcD400 you will have 6dB more power, for a sub this is a cost effective solution. Don't forget to use the 47nF coupling capacitor between the two hot outputs of the bridge UcD400.

Cheers,

Jan-Peter

[eleson]

Originally posted by eleson
I'm preparing for a 5 channel hypex amp and will (if nothing strange happens) go for a (actually two) SMPS from www.coldamp.com
/Erland

Maybe I should be more clear on the reasoning for thinking about this route.
Cost is of course one matter, but also
- size and weight.
- built in softstart.

But most of all maybe because I would like to do it this way.
/Erland

[hifiking]

In Norway a 700PSU cost 286 Euro, and the ST PSU cost 83 Euro. The 700VA is 165 Euro.

Thanks for your time Jan, I appreciate you taking time to help.

I can use a 47nf 1200V?

Regards Henning

[Pierre]

Does the UcD700 requiere an additional +12V output for the driver stage?
If so, can the aux. supply of coldamp SPS80 be used for that?

[novec]

Henning: The 800VA audio transformer on ELFA is pretty decent. It's wound on Noratel's special audio core, and magnetically shielded. Not fully potted, but still easy to mount with two holes in the center potting. If you need different values, Noratel (www.ulveco.no) can make them without much of a price premium. I paid 1300 kr (+tax) for a 1300VA 2x42V trafo with an extra 15V/15VA secondary when I ordered two of them.