[pabbi1]

Sorry to have been overly aggressive getting after folks to build. Take your time, as it really will be worth the effort. Enough are running to have determined any serious flaws by now.

But, some guys (Nate, Marc) are further along and are just shy.

 

[mideel]

Quote:

Originally Posted by runeight /img/forum/go_quote.gif No, 440VCT will not work. Sorry. If you have a SS amp the triads will work very well. Can you not get these? Or their equivalent?

It's not a matter of get its the postage, import fees and VAT hassle I'm more concerned about.

So 460VCT is the bare minimium (since that is what the two triads are rated for 4x 115 = 460VCT), for an SS build. So I can replace Triad VPS230-110 for a Triad VPT230-110 (same ratings but its a torroid) or another equivalent?
The reason I asked about the 230V (primary) 2x110V (secondary) rated transformer, was because it is being listed and sold as a 2x115V and I went over to the shop and asked about it in person and I was told it was 2x115V

 

[runeight]

Well, there is a bit of trickery involved here using the Triads.

These transformers have really bad regulation. In your case the 1:1 ratio would normally generate 460VCT with two transformers in series. However, the 110mA rating is about twice as high as needed. This means that the partially loaded transformers will actually generate more than 460VCT in operation. And this is why they will work.

But if your transformer, when loaded, only generates 460VCT then it will not work and you'll have find one that legimiately makes 500VCT.

Part of the original goal with this amp was no special transformers and so this little trick was used so that cheap triads could power the sand amp.

You can run a simple test. Wire up one of the transformers and measure the secondary voltage without any load. If it is way higher than 230VAC you're probably ok.

 

[mideel]

Thank you for the clarification, that made alot more sense. The VPS230-110 regulation is: "25% TYP @ full load to no load", so typically it will generate 125%*230V~288V with no load and since the eXStata is only drawing ~50% of the rated current you get alot more than the rated 230V.
I think it would be good to state this on the eXStata site or in the BOM, so that people in the future won't go "Oh, the triad is out of stock, but its rated 230V so I can replace it with another 230V transformer" (like I did

).

 

[runeight]

Good idea. I'll try to do that soon.

I hope that you've got enough accurate information now to find a transformer. It only took about 5 or 6 questions to get here.

 

[mideel]

I placed an order for two triads (hard to beat the price) other parts are already on the way so I will be starting the build in a few days (customs willing

).

 

[bidoux]

I finally did a Mouser order with the help of Beefy's project and Runeight's BOM, both were really hlepful. Now I'm waiting for it, anyone have a clue how long it will take to arrive in France (using Fedex) ?

I know I have been quite long to get starting, at the time I thought I'd helped completing the order but now lots of people want to build an ExStata, so I apologize for this.

 

[Sathimas]

shipping time should be under one week, they are really fast.

Btw. I: remove that "sorry for my bad English" from your signature
Your English is far to good to apologize for it.

Btw. II: Still someone here without headphone? My SR303 is still for sale

 

[bidoux]

Thanks for your answer, I hope I will be able to start it during my holydays.
As for my signature, sometimes my speaking is correct, sometimes it gets really awfull so I guess I'll leave it.

 

[mideel]

I placed my latest order on the 7th and reading from the FedEx tracking site:
Apr 8, 2010 20:38 - Left FedEx origin facility - MANSFIELD, TX
Apr 9, 2010 22:42 - At local FedEx facility - PARIS FR

So yeah, Mouser orders seem to ship really fast (although the Estimated delivery date is still Apr 16, 2010).

I still need some 600V hookup wire for this build though, I don't feel comfortable using generic computer 300V PSU wire or CAT6, although I will be using CAT6 for my other builds, its hard to beat something you get for free

Its unbelievable how much perfectly usable CAT6 wire (meaning Ethernet or LAN cable) and old electronics get thrown into the trash bin everyday.

 

[paxeaxe23]

I sent you a PM a fews days ago now about the Headphone. Let me know if it didn't get to you

Quote:

Originally Posted by Sathimas /img/forum/go_quote.gif Btw. II: Still someone here without headphone? My SR303 is still for sale

 

[bidoux]

Quote:

Originally Posted by mideel /img/forum/go_quote.gif I placed my latest order on the 7th and reading from the FedEx tracking site: Apr 8, 2010 20:38 - Left FedEx origin facility - MANSFIELD, TX Apr 9, 2010 22:42 - At local FedEx facility - PARIS FR

Are you a French ExStata builder ?

 

[paxeaxe23]

There seem to be quite a few Europeans here, maybe we should all club together and pay for Alex to come over and drink beer with us sometime!

 

[runeight]

I like this idea.

 

[bidoux]

So I got a mail from Mouser. It seems I will get the P channel mosfets in June 29, 2010, the MPSA42 in JUN 14, 2010 and a red Led in May.

I could have delete the MPSA42 and LED from the order as they are available in the local shop bbut the mos aren't. I guess I will wait until this summer.