Burning Amplifier BA-1 - Page 3

Nelson Pass · 21st April 2009, 08:29 PM

Quote:

Originally posted by Eric Weitzman
25 watts per channel seems low if the amps are dissipating 300 watts per stereo channel and the output stage is drawing 3.5A at 50V. Where are the missing 100 watts?

They are pure heat. This is a Burning Amp.

You will get a lot more efficiency out of BA#2, which is push-pull
instead of single-ended/constant current source.

If you want more efficiency out of the all-N channel output stages,
we will expect to be doubling the efficiency in a later version.

Variac · 22nd April 2009, 12:06 AM

One of the reasons the board area is pretty tight is that the shorter chassis is very congested inside compared to t he longer one. - Mainly due to fitting in 4 supply capacitors...

I'm not sure if there ARE any short chassis with all 240 output devices..

Nelson states that with Elna Silmic 10uF radial caps it sounds great- now those would be easy to fit!! What other radial caps are there that people might consider?, and what are their lead spacing and size?

Variac · 22nd April 2009, 12:12 AM

This would be a great design for those that have gotten irf250 mosfets from Nelson over the years at Burning Amp. You would only need 4 or 6 per channel as each 250 is pretty much two 240's in one can...

eyoung · 22nd April 2009, 02:13 AM

I am waiting with much excitement and anxiety.

That would be a bump, I Think...

keep me in the loop.

Elwood.

CfM · 22nd April 2009, 06:05 AM

Quote:

Originally posted by Variac
What other radial caps are there that people might consider?, and what are their lead spacing and size?

Wima MKP10 - lead spacing 37,5 mm - width 20 mm
... would be my consideration.
But I could also go with axial caps as you proposed if this is the common agreement.

Chris

Variac · 22nd April 2009, 06:23 AM

Clearly cviller intends for it to work with a lot of caps. I think having your suggestion as an option is a good idea.

cviller · 22nd April 2009, 06:25 AM

I'm quite sure I have left space for 37.5 pin distance - if not it's a mistake.

Variac · 22nd April 2009, 06:51 AM

He's worried about the width too..

Variac · 22nd April 2009, 06:53 AM

WE HAVE CORRECTED THE ARTICLE

Now its Rev. 1.0 as suggested

Please check it out........

Thanks for your patience

Eric Weitzman · 22nd April 2009, 05:54 PM

Quote:

Originally posted by Nelson Pass
If you want more efficiency out of the all-N channel output stages,
we will expect to be doubling the efficiency in a later version.

By turning it into an A5?

- Eric

22nd April 2009, 12:06 AM	#22
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	One of the reasons the board area is pretty tight is that the shorter chassis is very congested inside compared to t he longer one. - Mainly due to fitting in 4 supply capacitors... I'm not sure if there ARE any short chassis with all 240 output devices.. Nelson states that with Elna Silmic 10uF radial caps it sounds great- now those would be easy to fit!! What other radial caps are there that people might consider?, and what are their lead spacing and size? __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!

22nd April 2009, 12:12 AM	#23
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	This would be a great design for those that have gotten irf250 mosfets from Nelson over the years at Burning Amp. You would only need 4 or 6 per channel as each 250 is pretty much two 240's in one can... __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!

22nd April 2009, 02:13 AM	#24
eyoung diyAudio Member Join Date: Aug 2007 Location: Sunny SC,USA 15 min south of Charlotte NC	I am waiting with much excitement and anxiety. That would be a bump, I Think... keep me in the loop. Elwood. __________________ "Sometimes obstacles are put in our way to make us slow down so that we can enjoy the journey and appreciate the destination when we eventually get there"

22nd April 2009, 06:23 AM	#26
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	Clearly cviller intends for it to work with a lot of caps. I think having your suggestion as an option is a good idea. __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!

22nd April 2009, 06:51 AM	#28
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	He's worried about the width too.. __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!


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22nd April 2009, 06:25 AM	#27
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	I'm quite sure I have left space for 37.5 pin distance - if not it's a mistake.

22nd April 2009, 06:53 AM	#29
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	WE HAVE CORRECTED THE ARTICLE Now its Rev. 1.0 as suggested Please check it out........ Thanks for your patience __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!

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