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Old 16th January 2011, 09:49 PM   #611
Forsman is offline Forsman  Sweden
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Aha, in that case they need to be at least 300 VA or I will not get enough VA in the end. Ill look in to the transformers specs better before I purchase them.

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Old 16th January 2011, 10:04 PM   #612
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exactly
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Old 16th January 2011, 10:04 PM   #613
tinitus is offline tinitus  Europe
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but with paralel secondary, wouldnt Ampere double, and VA remain the same ?
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Old 17th January 2011, 03:37 AM   #614
tinitus is offline tinitus  Europe
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ach, not only voltage but also current will half
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Old 17th January 2011, 06:43 AM   #615
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Hi Frederik,

you may want to make the mounting of this brick flexible in the sense that you can adjust its orientation. These EI-types have quite some stray fields that could make problems (that are often solved by rotating them by 90 degrees or so).
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Old 17th January 2011, 10:09 AM   #616
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If you connect two transformers in parallel or series you may have problems if there are differences in their impedences. This could result in overloading of one of the pair.
If you connect secondaries in parallel you double the current whilst the voltage remains the same.
I don't feel confident enough to play around with mains voltages when it comes to transformers. I can recommend Canterbury Windings in the UK to hand build something to your specs. You can email your requirements and Terry will email you back the price. I'd rather pay the extra on the transformers than medical bills if things go wrong. Medical bills, that is, if you are lucky!
Regards,
Chris
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Old 17th January 2011, 10:12 AM   #617
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On another note now that the new pcb boards have arrived, what do I need to order if I'm building two monoblock BA-2s?
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Chris
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Old 17th January 2011, 11:11 AM   #618
h_a is offline h_a  Europe
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You might want to search for the BOM (bill of materials), I'm sure there's one somewhere in this thread.

Of course, you need quite some stuff in addition that is usually not included in the BOM, like toroid, heatsinks, power supply caps, rectifiers, connectors, cabling

Enjoy, Hannes
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Old 17th January 2011, 03:47 PM   #619
Forsman is offline Forsman  Sweden
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Hi again

Now the transformers are tested to see how they perform in reality.

With 2 transformers with the mains (230 VAC) in series and the secedaries in parallel with pure resistance as a load (not sure on how much) we get the following figures:
  • 20.4 A - 15.7 VAC
  • 15.6 A 16.4 VAC
  • 11.1 A 17.1 VAC
The temperature of the transformers became approximately 40-45 C.

The numbers above are measured on 2 transformers and I have 4 available.

What is your take on this?


Kind regards
/Forsman
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Old 17th January 2011, 06:52 PM   #620
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Forsman View Post
The temperature of the transformers became approximately 40-45 C.
Hi,
what is the temperature inside the transformer?
Do you think the internal temperature rise has any relevance to reliability?
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