is 24-0-24V 800VA ok?

audioDIYer · 28th April 2006, 12:05 PM

Hi!

I have a 24-0-24V 800VA transformer and I want it to power my Aleph3 boards...

After the caps and without load (boards not connected

) I have 32.5V...
Also, the FETs I use are IRFP048...

Can this be possible to work without burning?!

With 15-0-15V transformer (+/- 21VDC) the heatsink get

...
Now I wonder what can happen with +/- 32.5V...

Any help?!

MikeW · 28th April 2006, 01:07 PM

1. It will get much hotted.
2. The outputs are rated for 55 volts and is close to exceeding that with the 64 volt swing - losses for the rails.
http://www.irf.com/product-info/data...a/irfp048n.pdf
3. I would stick with the 15-0-15 and enjoy the music.
4. It woul be good for an Aleph 5.

jeapel · 28th April 2006, 08:43 PM

hi

for (canada) power house is 120vac

take a normal transfo 250va 24vac 10A (with or without center tap)
wired like a autotransformer to get 100 or 110vac
and in my test i get exactly +-25v with 100vac on my big 750va toroid
for my aleph 3

and 100vac give a more low noise toroid

for europe often power house is 240vac maybe a
48vac 5A do the job

bye

jeapel · 28th April 2006, 08:47 PM

i forget :-)

i get +-25v with 100vac with load connected 4A
(2 channel with just 1 transfo)

28th April 2006, 12:05 PM	#1
audioDIYer diyAudio Member Join Date: Dec 2005 Location: At work	is 24-0-24V 800VA ok? Hi! I have a 24-0-24V 800VA transformer and I want it to power my Aleph3 boards... After the caps and without load (boards not connected ) I have 32.5V... Also, the FETs I use are IRFP048... Can this be possible to work without burning?! With 15-0-15V transformer (+/- 21VDC) the heatsink get ... Now I wonder what can happen with +/- 32.5V... Any help?!

28th April 2006, 01:07 PM	#2
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	1. It will get much hotted. 2. The outputs are rated for 55 volts and is close to exceeding that with the 64 volt swing - losses for the rails. http://www.irf.com/product-info/data...a/irfp048n.pdf 3. I would stick with the 15-0-15 and enjoy the music. 4. It woul be good for an Aleph 5. __________________ MikeW

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28th April 2006, 08:43 PM	#3
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	hi for (canada) power house is 120vac take a normal transfo 250va 24vac 10A (with or without center tap) wired like a autotransformer to get 100 or 110vac and in my test i get exactly +-25v with 100vac on my big 750va toroid for my aleph 3 and 100vac give a more low noise toroid for europe often power house is 240vac maybe a 48vac 5A do the job bye

28th April 2006, 08:47 PM	#4
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	i forget :-) i get +-25v with 100vac with load connected 4A (2 channel with just 1 transfo)

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