PROJECT begins: bass preamp

zafira1981 · 27th July 2006, 10:27 PM

Well I decided to start building the preamp stage of the mesa/boogie bass 400 amp.

schematics:
http://img115.imageshack.us/img115/9294/preampav1.gif

Parts

I dont trust on the small caps. The guy at the shop told me that will suport 500v, but...

I will try to find some others!! what do you think?

The output stage will be a lm3886 gainclone, maybe 2 or 3 with diferent speakers.

http://img291.imageshack.us/img291/7704/dsc09418hv7.jpg

(4x 150VA 12v transformers to make 2x24v 600VA + 8 MUR840 fast diodes + 30000uF each rail

)

Why not a tube output? because I dont have such big output "iron" =(

maybe in the future I will build one with this output tubes

http://img105.imageshack.us/img105/3092/dsc03587vi2.jpg

Any advice for my project is welcome

cpasco · 17th October 2006, 02:59 PM

What´s the power transformer used in these project?

zafira1981 · 17th October 2006, 03:36 PM

Quote:

Originally posted by cpasco
What´s the power transformer used in these project?

Hi!!! I used that transf. because I had it from another project.. maybe I will buy a new one, smaller.

cheers

27th July 2006, 10:27 PM	#1
zafira1981 diyAudio Member Join Date: Jan 2005 Location: Argentina	PROJECT begins: bass preamp Well I decided to start building the preamp stage of the mesa/boogie bass 400 amp. schematics: http://img115.imageshack.us/img115/9294/preampav1.gif Parts I dont trust on the small caps. The guy at the shop told me that will suport 500v, but... I will try to find some others!! what do you think? The output stage will be a lm3886 gainclone, maybe 2 or 3 with diferent speakers. http://img291.imageshack.us/img291/7704/dsc09418hv7.jpg (4x 150VA 12v transformers to make 2x24v 600VA + 8 MUR840 fast diodes + 30000uF each rail ) Why not a tube output? because I dont have such big output "iron" =( maybe in the future I will build one with this output tubes http://img105.imageshack.us/img105/3092/dsc03587vi2.jpg Any advice for my project is welcome

17th October 2006, 02:59 PM	#2
cpasco diyAudio Member Join Date: Sep 2006	Power Transformer What´s the power transformer used in these project?

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