View Full Version : Power rating for diy-cap transformer


natzev_i
13-10-06, 04:22 AM
Hi,
It seems I have to order custom build transformer with dual center-tapped secondaries for my diy-cap project. What current and power capabilities should I ask for?
IIRC Hi-Cap uses 350VA toroidal but itíll be too big for non-toridal designs.
What would you recommend?
Thanks,
Ivo

Wilky
13-10-06, 04:52 AM
Ivo...IFAIK the Hi-Caps use 500VA toroidals.

Look on the Acoustica Site (Martin Clark's) for some guidance on Naim PSU's + some of Teddy Pardo's thread on PFM.

Here is a link to Martin's site.

http://www.acoustica.org.uk/t/naim/powersupplies.html

Regards Dave.

natzev_i
13-10-06, 07:39 AM
Thanks Dave,
Of course youíre right Ė itís 500VA- my mistake, sorry.
It seems though the power ratings for the toroids are way too high than those for the C-/R-cores for the same purpose. Carl mentions he uses 30VA EI-core from Les with good results Ė itís 17 times weaker than the toroid in the original HiCap!!!
Now I am really confused what to order :confused:

martin clark
13-10-06, 07:50 AM
If you are looking to clone a hi-cap, then using a large transformer remains worthwhile (it is not a lot more expensive than even a small transformer).

But if you are going to be experimenting with gyrators and superregs, then such a large device may no longer be necessary to get equal or better results - although it will still work, obviously!

natzev_i
13-10-06, 08:41 AM
Martin,
I am about to assemble the two PSU kits I bought from White Noise couple of months ago (just before David closed his business). The latest WhiteNoise Regs use the same Walt Jung design as the ALWSuperRegs do.
It seems the toroids are more popular and easy to locate/order.
So, in my case if I go the ďtoriodĒ way do you thing I still need 500VA and up for the SRegs or 200-300VA will do the job with same results?

LesW
13-10-06, 09:04 AM
Ivo, if you're having these kind of supply problems, I'll take the risk by sending you a couple of transformers. If they arrive then you can pay for them - if not, not much lost I suppose. Be with you next week (5-7 days according to Parcel Farce)

natzev_i
13-10-06, 09:25 AM
Thatís great news Les!
If everything goes OK Iíll order the other bits Iíll need (caps, din-plugs, cables Ė you know) but when I get back since Iím leaving at the end of next week for a month.
Do you still have my credit card number? Ė if not Iíll call you next week.
Thanks a lot!
Ivo