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Old 2nd December 2012, 05:19 PM   #571
AudioSan is offline AudioSan  Norway
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what's the sec voltage for that 1KVA transformer?
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Old 2nd December 2012, 11:45 PM   #572
anilva is offline anilva  India
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Quote:
Originally Posted by dazed2 View Post
Anivila, great job!
Thank you for the review of your impressions against the F5. What you said is exactly the reason I am about to embark on building the V3

BTW how did you go about tuning harmonics using P3?
I did not tune the harmonics yet. The wiper of 200 ohms preset is set in the middle. I don't have the means to measure distortion nor do I have access to scope. Will attempt one of these days, if I can do it with a borrowed scope.

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Originally Posted by AudioSan View Post
what's the sec voltage for that 1KVA transformer?
The secondary voltage of the toroid is 24v per winding.
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Old 3rd December 2012, 12:02 AM   #573
AudioSan is offline AudioSan  Norway
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2x24V transformer is useless for V3. you vill not get any more power from it, then from V2.
you need about 2x35V transformer to hit the magic 100W class A number at 8ohms.

Last edited by AudioSan; 3rd December 2012 at 12:05 AM.
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Old 3rd December 2012, 12:18 AM   #574
buzzforb is offline buzzforb  United States
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Testing harmonic structure means buying a soundcard and getting free software like ARTA or Visual Audio analyser. Audio San is correct that you would have plenty of available CLass A current, but would be voltage limited.
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Old 3rd December 2012, 12:31 AM   #575
dazed2 is offline dazed2  Canada
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Wow, so at 35V secondaries, are we running 45V rails? would 50V caps be at the limit! starting to get expensive
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Old 3rd December 2012, 12:40 AM   #576
AudioSan is offline AudioSan  Norway
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with 50V caps on 45V rails you have above 10% headroom.
unless you run the PSU unloaded.
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Old 3rd December 2012, 12:50 AM   #577
anilva is offline anilva  India
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Quote:
Originally Posted by AudioSan View Post
2x24V transformer is useless for V3. you vill not get any more power from it, then from V2.
you need about 2x35V transformer to hit the magic 100W class A number at 8ohms.
I completely missed this fact. I agree. I might get higher current capability with more number of output devices but there will be no higher voltage swing. Looks like I need to order a 35V secondary trafo for V3.
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Old 3rd December 2012, 12:51 AM   #578
anilva is offline anilva  India
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Quote:
Originally Posted by buzzforb View Post
Testing harmonic structure means buying a soundcard and getting free software like ARTA or Visual Audio analyser. Audio San is correct that you would have plenty of available CLass A current, but would be voltage limited.
I do have decent sound cards including an external USB M-Audio device. I need to check on the software.
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Old 3rd December 2012, 03:19 AM   #579
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by AudioSan View Post
2x24V transformer is useless for V3. you vill not get any more power from it, then from V2.
you need about 2x35V transformer to hit the magic 100W class A number at 8ohms.
Lol ,

magic 100watt what makes 100 watt @8 ohm magic .....?
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Old 3rd December 2012, 03:52 AM   #580
dazed2 is offline dazed2  Canada
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Just did some quick calculation. Please tell me if I'm wrong.
at 100W into 8 ohm you will need 26.83VDC at the speakers. Since we need to calculate it in ACV then we multiply by root 2 or 1.414 thus giving us about 40V rails.
Using NP's approximation 40V rails would require about 30V secondaries at the transformer.

Is this correct?
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