Burning Amplifier BA-1 - Page 23

Tea-Bag · 16th June 2011, 01:13 AM

Quote:

Originally Posted by toufu

Does the front end need it's own power supply or can I just use one for everything? Thanks.

You can use one Power supply.

generg · 16th June 2011, 03:19 AM

One power supply for all...

toufu · 17th June 2011, 07:03 PM

Cool... thanks guys.

Alettagla · 10th July 2011, 04:31 PM

Help needed,

When using only the powerstage Like is suggested in the ba1 article. which parts can be removed and which other ajustments have to be made.

Thanks in advance for any help.

Nelson Pass · 10th July 2011, 04:42 PM

Here's what the output stage looks like with the front end removed. It
contains the components to bias it.

Alettagla · 10th July 2011, 06:26 PM

Thank you so much,

I'm just in te process of designing the layout for two hard wired monoblocks.
Each monoblock will consist of two aluminium profiles mounted to the left and richt side heathsink of a mono chassis. One side will carry the upper halve of the gain stage and the other side will cary the down halve of the gain stage.
This construction will provide me an easy way of trying different desings. or circuit boards.

power supply 1000 va and 300.000 mf per channel.

Hope there will be enough voltage delivered by my Wadia 830..

Thanks you so much again.
René

h_a · 13th July 2011, 06:13 AM

Quote:

power supply 1000 va and 300.000 mf per channel.

With that power, just be sure you put inrush current limiting in front to avoid poping fuses

But I guess you know that already

Hannes

Alettagla · 13th July 2011, 04:39 PM

You are probably not to good at guessing. :-)
To be honest I did not think about this yet.
Never worked with amps consuming these high currents.
But since you mention I do remember this might become an issue.
Do you know of any simple solution for this?

h_a · 14th July 2011, 06:00 AM

Simplest way is to try the big CL-60 thermistors in series with the primaries.

There are also more complicated ways with soft-start circuits that e.g. bypass a series resistor after a certain time. I like the simple solutions, usually very effective!

Hannes

digits · 14th July 2011, 06:30 AM

I am glad I SPENT THe few extra bucks to get the transformer with dual 115V primaries now. Do I use the same CL60 thermistor for that? it is a 225VA 12V jobbie for the mini A???

16th June 2011, 03:19 AM	#222
generg diyAudio Member Join Date: Jul 2009 Location: Near Frankfurt	One power supply for all... __________________ and the First Wtt is......a really First Class PSS Idea !

14th July 2011, 06:00 AM	#229
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Simplest way is to try the big CL-60 thermistors in series with the primaries. There are also more complicated ways with soft-start circuits that e.g. bypass a series resistor after a certain time. I like the simple solutions, usually very effective! Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2 transistor kits

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17th June 2011, 07:03 PM	#223
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	Cool... thanks guys.

10th July 2011, 04:31 PM	#224
Alettagla diyAudio Member Join Date: Oct 2008	Help needed, When using only the powerstage Like is suggested in the ba1 article. which parts can be removed and which other ajustments have to be made. Thanks in advance for any help.

10th July 2011, 06:26 PM	#226
Alettagla diyAudio Member Join Date: Oct 2008	Thank you so much, I'm just in te process of designing the layout for two hard wired monoblocks. Each monoblock will consist of two aluminium profiles mounted to the left and richt side heathsink of a mono chassis. One side will carry the upper halve of the gain stage and the other side will cary the down halve of the gain stage. This construction will provide me an easy way of trying different desings. or circuit boards. power supply 1000 va and 300.000 mf per channel. Hope there will be enough voltage delivered by my Wadia 830.. Thanks you so much again. René

13th July 2011, 04:39 PM	#228
Alettagla diyAudio Member Join Date: Oct 2008	You are probably not to good at guessing. :-) To be honest I did not think about this yet. Never worked with amps consuming these high currents. But since you mention I do remember this might become an issue. Do you know of any simple solution for this?

14th July 2011, 06:30 AM	#230
digits diyAudio Member Join Date: Apr 2011	I am glad I SPENT THe few extra bucks to get the transformer with dual 115V primaries now. Do I use the same CL60 thermistor for that? it is a 225VA 12V jobbie for the mini A???