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Old 6th September 2008, 02:26 PM   #21
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Quote:
Originally posted by Nuuk
Again, I don't want to go into so much detail it looks like a University degree course. However, it is important to stress that a load must be connected to the bridge when taking the measurements. Hence the following quote from the section on testing!

Yes a capacitor must be on the output but that is not a load. A load will consume a significant % of transformer current capacity, while a capacitor only filters, reduces ripple instead of being a load. Without a load you will only see peak output, though it is still a good thing, still important to know the peak voltage because it can't be allowed to exceed the capacitor, chipamp, or other parts' voltage ratings.

Then by knowing the peak it can be determined to be working and safe to hook up the amp, then with amp outputting to the speakers the actual load on the PSU can the load under which a second PSU voltage measurement is taken.
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Old 6th September 2008, 03:57 PM   #22
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You can see some real life measurements here: http://www.diyaudio.com/forums/showt...40#post1521340

The transformer was 300VA, 2 x 22V AC Plitron.
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Old 7th October 2008, 11:32 PM   #23
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Thanks for the help!
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Old 12th October 2008, 11:27 PM   #24
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i have 2 25-0-25 100W toroidal transformer and i want to use one / channel.

i see a lot of design that use 0-25 transformers (without CT) wich will be the diference?

will be better to use 0-25 instead 25-0-25 ?
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Old 13th October 2008, 12:26 AM   #25
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Hi,
use either a dual secondary 0-25, 0-25Vac
or
a centre tapped secondary 25-0-25Vac.

A single secondary will give a single polarity supply and you then have to redesign your amplifier to operate from a single polarity supply. See the datasheet for details.
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Old 24th October 2008, 03:05 PM   #26
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Quote:
Originally posted by samsagaz
i have 2 25-0-25 100W toroidal transformer and i want to use one / channel.

i see a lot of design that use 0-25 transformers (without CT) wich will be the diference?

will be better to use 0-25 instead 25-0-25 ?
0-25 transformers (without CT) will give you the option to use separate bridges, with CT it's not possible.

Depending on your setup, this may be advantage or not.

http://www.diyaudio.com/forums/showt...ht=#post331061
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Old 2nd November 2008, 10:37 PM   #27
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Using 1 CT for each channel will improve anything? or just will loose my money doing that?

I want to use dual rectifiers, but i dont have 0-25 0-25 Secundary, i just have 2 CT 25-0-25.
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Old 2nd November 2008, 10:40 PM   #28
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Dual mono does bring a definite improvement in my experience. If you already have the transformers, it won't cost you much more.
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Old 3rd November 2008, 01:56 AM   #29
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Quote:
Originally posted by Nuuk
Dual mono does bring a definite improvement in my experience. If you already have the transformers, it won't cost you much more.

wow, nice

btw, how can i measure if the gain and output power of both Mono amps are the same? :S
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Old 3rd November 2008, 02:01 AM   #30
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See the link in Post #22
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