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Old 15th November 2006, 12:34 AM   #11
scottw is offline scottw  United States
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Thanks all for considering and answering my questions. Interesting reading.

As this application is for powering a two channel chipamp, a 700va toriod would have a huge amount of headroom and the more I think and read about it, a 400va toroid might be a better choice. I think a 400va would still be well overrated for the application, eaiser to find with the correct secondary voltages, a little cheaper, and less concerns about startup surges (don't like my fuses emitting photons). I really don't want to have to do a soft-start for this thing.


Thanks,

Scott
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Old 15th November 2006, 08:14 AM   #12
AndrewT is offline AndrewT  Scotland
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Hi,
if you plan about 50W to 60W from your chip amps then 180VA to 250VA will be adequate for very good performance.

BUT, do use a separate rectifier and pair of smoothing caps for EACH chip amp.
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Old 15th November 2006, 09:07 AM   #13
Electrons are yellow and more is better!
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250 VA for 2 x 50 W is BIG

For home use I would say equally (at least) many VA as watts out IF you are planning to play "music" out of the amp. Remember that the VA rating is determined by the average power and the limiting thing is the temperature inside the transformer.

2 x 100 W => 200 VA transformer
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Old 15th November 2006, 12:37 PM   #14
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Default Re: Toroidal transformers

Quote:
Originally posted by scottw

AnTek on ebay sells a variety of toroids(made in China), and through forum searches it seems most people that have used these have been happy with them. Any others wish to comment on these toriods? If it hums I have an expensive paper weight!

These toroids are dual primary, parallel for 115vac or series for 230vac (hope I got that right). So my question, if you had a toriod with dual 40v secondaries, could you series connect the primaries and run 115vac and get 20v from the secondaries? Would the VA rating decrease, would the tx be more prone to mechanical hum or run hotter? What size fuse would it take to light a 700va toriodal wired this way?

Thanks,

Scott
I have bought several transformers from John (AnTek in North Arlington NJ) -- these are rated for continuous CNC servo applications so they are quite sturdily built for Audio applications. they are in the process of setting up a website.
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Old 15th November 2006, 01:04 PM   #15
jmateus is offline jmateus  United States
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I too have bought those toroids, they are excelent, and I have the chance to drive up there and save the shipping costs. John is a nice
guy and very helpful where details on these transformers are needed.
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Old 16th November 2006, 01:11 PM   #16
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Can one of youse guys post John's phone number ov'a dherr at antek in joisey?
Google gives me listings for antek all around the world, but can't find one for arlington in nort joisey.
know what I'm sayin'? what youse gonna do? ahnh? fuggittabottitt.
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Old 16th November 2006, 01:23 PM   #17
Electrons are yellow and more is better!
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Can't you use the Yellow Pages or similar over there? If I'm not mistaken you have several phono books on the net over there.
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Old 16th November 2006, 01:26 PM   #18
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Contact him through EBay -- just use the "Question" Function.
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Old 16th November 2006, 01:40 PM   #19
jmateus is offline jmateus  United States
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Hi Head_spaz
Here's the telephone number for Par-Metal Products, Inc and John
Ngo, general Manager: (201)955-0800.
Web site http://www.par-metal.com
Adress : 29 Ewing Ave, North Arlington, NJ 07031

I hope this is useful
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Old 17th November 2006, 11:09 AM   #20
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Thanks guys.
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