Which trafo option for LM3875?

maurycy · 27th March 2010, 12:18 AM

This would be for stereo LM3875:

Option 1: two PSU boards powered by two 21V-0-21V 80VA toroids (one per PSU).

Option 2: one PSU board powered by one 2x21.5V 2.7A

Which option is better? I am leaning toward option #2 as the space in the case is pretty tight. Option #1 would work but it would require major thinking when it comes to part placing and wiring.

Also, am I correct in my math that the two options are only 0.5A different (converting VA to A)?

Thanks.

AndrewT · 27th March 2010, 09:54 AM

can you afford the cost of two transformers and two chassis?

maurycy · 27th March 2010, 12:01 PM

Quote:

Originally Posted by AndrewT

can you afford the cost of two transformers and two chassis?

I have the aluminum case all cleaned and I do not want to get more trafos. I want to stick to what I already have. Wife already thinks I am crazy collecting all the electronic parts :-)

AndrewT · 27th March 2010, 01:07 PM

I think you are saying you have two 80VA transformers, two PSUs, two amplifiers, one chassis.

You are one chassis away from dual monoblock amplifiers.
I expect monoblock to perform better than option 1 and option .

maurycy · 27th March 2010, 02:57 PM

What about just staying with the listed options? Which one would work better?

27th March 2010, 01:07 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I think you are saying you have two 80VA transformers, two PSUs, two amplifiers, one chassis. You are one chassis away from dual monoblock amplifiers. I expect monoblock to perform better than option 1 and option . __________________ regards Andrew T.

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27th March 2010, 12:18 AM	#1
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	Which trafo option for LM3875? This would be for stereo LM3875: Option 1: two PSU boards powered by two 21V-0-21V 80VA toroids (one per PSU). Option 2: one PSU board powered by one 2x21.5V 2.7A Which option is better? I am leaning toward option #2 as the space in the case is pretty tight. Option #1 would work but it would require major thinking when it comes to part placing and wiring. Also, am I correct in my math that the two options are only 0.5A different (converting VA to A)? Thanks.

27th March 2010, 09:54 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	can you afford the cost of two transformers and two chassis? __________________ regards Andrew T.

27th March 2010, 02:57 PM	#5
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	What about just staying with the listed options? Which one would work better?

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