board suggestion for given PSU (+/-45v or +/- 90v)

[Alexontherocks]

Hi all, I am posting for a friend who would like to put to good use a PSU section he recently came across:

1) 1500v toroidal with common 30 (CT) and 60v (CT) rails
2) fast diodes and total capacitance of 150,000uf in total (more or less).

He has little time to spare (and since I offered my help...it is also my time ) so he would like to purchase a kit or, better yet, pcb boards for a stereo build.

Topology does not seem important (but I think that the small value of capacitance rules out large class A builds but maybe small ones?)

Load to drive 8 ohm medium to high sensitivity speakers. Power rating suggested (30-60w or more if compatible with HIFI given the described psu)

I am sorry to bother the forum with such a question but I was hoping for some nice useful advice. I realize it may be against forum rules but a link to some vendor would be great.

best regards
Alex

 

[AudioSan]

hypex UcD700HG, 8ch UcD180HG, F5turbo V3(need more caps)

 

[Alexontherocks]

Thanks! the hypex module is really expensive! Is there something cheaper (preferably in the form of a pcb so that the components may be bought in time?)

The lower voltage would seem good for an aleph 2 but not high enough for a dx destroyer

Strange voltages.

 

[Alexontherocks]

possibly the voltage can be tuned down a little bit with a small isolation transformer 230 - 185v

The only project I found is the nmos series amps (nmos 500 maybe?)

 

[AudioSan]

yes, there is some cheap amps like this one.
Tripath TA0105A 800Wx2 Super Class-T Audio Amplifier SRH-09 - Boards | Kits | Components | Modules | Tools

for use with class A. he will need more caps. there may be som class A/B amps that run on +/-90V. or smaller multichannal class A/B on +/-45V like the 2pair output DX maybe?

 

[Alexontherocks]

thanks for your help (my friend thanks you too).

I built a small quasi nmos 200 and found the big brother nmos 500. What do you think. The requirements are perfec. 72/75v + small enough capacitance (half of what my friend has would be sufficient for the project).

Class A is out of the question, I know (no point in walking down that path if you can't achieve full current draw with an acceptable ripple).

 

[AudioSan]

here are some reading
http://www.diyaudio.com/forums/solid-state/96237-destroyer-x-amplifier-dx-amp-my-amplifier.html

i don't know that amp. but i can see what i can find

 

[Alexontherocks]

https://sites.google.com/site/quasisdiyaudiosite/nmos-series/nmos350-500

Here... the site is quite clear. The design is simple and I really like the nmos 200 so I think the bigger brother won't disappoint

P.s. I just figured...if I printed the thrad on the dx amp I'd probably run out of toner.....4 times

 

[AudioSan]

looks nice. but its +/-75V max. on the other hand. nmos200 works great on +/-45V
but the transforme is a LITTLE bit overkill

 

[Alexontherocks]

you are right! the tansformers is overkill but as with many diy projects we work with what is handed by fate (or pocket money ). In this case it is a 1200 (not 1500w, my mistake) transformer.

I'll look into the 500 and my own 200 version. Multichannel perhaps? The nice thing about the nmos 500 is that it incorporates the dc detect, it has tons of power and runs comparatively cool.

If running a pair of 500w per channel boards is a waste of a 1200w transformer then running a couple of nmos 200 boards would be an even greater waste.

I will ask him to check the voltage rail again...there is something which does not compute

 

[AudioSan]

6ch nmos200? maybe bridge 4 of them

 

[Tekko]

Dump the hypex class d crap and go with apex audio 500W and/or 900W amp.