Norton Airpower DIY - help!

[Frankyc2003]

Hi everyone,

I am contemplating making one of these to power my Heybrook TT2

http://lnantispam.wix.com/norton-technologies#!airpower/c17k4

but due to being quite thick, I am wondering if someone could clarify the ratings necessary for each transformers.

I am looking at farnell Uk and I could go with a few options, so I need to be 100% sure what I am looking for.

Many Thanks in advance to all of you

F

[YNWaN]

One that is 60 Volt and one that is 80 Volt according to the website.

[Frankyc2003]

yes, but (excuse my ignorance) is this value:

- the VA rating or
- the secondary windings output?

[Firebottle]

Hi Francois, the 60 and 80V are the secondary voltages. The VA rating required (used in the kit) is 30VA for each trannie.

:cool: Alan

[Frankyc2003]

Cheers Alan, always on the money!!!

So if I get a 2 x 30V - 30VA and a 2 x 40V - 30VA, I should be OK?

Ta

[Firebottle]

You only need 30VA total for each of the 60 & 80V so you could buy 2x 15VA 30V and 2x 15VA 40V.

You will probably find trannies larger than 15VA are cheaper as it is more difficult to wind smaller toroid trannies.
I don`t suppose you are stuck for space though.

:cool: Alan

[Frankyc2003]

:scratch::scratch:

sorry but now I am a bit confused…

where does the values of 60v and 80v come from then on the schematic if I only have secondaries rated at 15V?

are you saying that I only need to output 30v out of each transformer? Surely that goes against the idea that 2 different voltages make the shift in phase in the motor?

Sorry again for being thick, but Transformer have a tendency to confuse the hell out of me!

[sq225917]

Save yourself the hassle buy this off me.

http://farm9.staticflickr.com/8181/7921124484_c79ea06d2a_z.jpg

http://farm8.staticflickr.com/7200/6823360144_8b3cd6ac42_b.jpg

Comes in Naim shoebox case, yours for £250 inc post.

[Frankyc2003]

Nice work Simon!

But that's basically twice as much as I can spend on a PSU… and that deprives me from the fun of building it as well…

I would rather learn something and have a project to do over the next few weeks.

Thanks though for the offer

[Firebottle]

I`m taking of the power rating when I said 15VA.
The voltages still need to be 60 and 80 volts.

Keep asking questions and I`ll explain each one :)

:cool: Alan

[Frankyc2003]

On farnell website I just can't find the voltages I need in the suggested 15VA...

So options are these 2 TXs.

http://uk.farnell.com/multicomp/mcta250-40/transformer-250va-2-x-40v/dp/9530835

http://uk.farnell.com/multicomp/mcta250-30/transformer-250va-2-x-30v/dp/9530797

Any good?

The other solution I read somewhere else is to find a single transformer with different voltage on each secondary windings... Probably not an easy find though...

[Firebottle]

Yes no problem Francois, sorry I missed this thread before now.

I was only saying that you could use lower power trannies as you are proposing to use two for each voltage. 30VA (1st tx) + 30VA (2nd tx) = 60VA power rating.

Using larger rated trannies is perfectly OK :)

Alan

[karma67]

im trying to work out the same thing so there are 2 thicko's in the class :)
as i understand it i need 2 transformers 1 with a secondary output of 80v and 1 with 60v.
the website states,'The 30VA (2 x 15VA) types in the Mk2/kit version' . so i think this means 1 transformer with a primary of 15va,secondary 80v and 1 15va.secondary 60v.??

also how important is the primary value as the production norton psu uses 1 giant transformer rated at 1000VA

my head hurts!!