simple but powerful

[sr2002]

hey and can u also tell me how can i add a volume control to this amp?

i want a common volume control for both channels

[sr2002]

hey i have assembled the board,

thing is i am plannin to use +/-30v 5amp trafo.

so do u think it will do it? and i am not using this one to power a sub ok? i just want the amp to play on regular home cinema speakers.

so the thing is i will be building a stereo amp that is total 4 lm3886.

so will 5amp +/-30v be enough? i mean cuz u know the trafos. get real costly once u cross 5amps.

and could u send me a simple regulated power supply schm?

and about the zobel network, i chose the one that carlos has sent.
http://www.diyaudio.com/forums/show...ht=zobel+bridge

so i will need one zobel per chip right so 2 on one bridge ?

i'll send u a pic of wut i mean.

and thats it right no more mods ?

[sr2002]

hey i have assembled the board,

thing is i am plannin to use +/-30v 5amp trafo.

so do u think it will do it? and i am not using this one to power a sub ok? i just want the amp to play on regular home cinema speakers.

so the thing is i will be building a stereo amp that is total 4 lm3886.

so will 5amp +/-30v be enough? i mean cuz u know the trafos. get real costly once u cross 5amps.

and could u send me a simple regulated power supply schm?

and about the zobel network, i chose the one that carlos has sent.
http://www.diyaudio.com/forums/show...ht=zobel+bridge

so i will need one zobel per chip right so 2 on one bridge ?

i'll send u a pic of wut i mean.

and thats it right no more mods ?

[demogorgon]

sr2002, the 5amp 30V trafo will be fine, though if it's 30VAC, your pushing the limits of chip safe suply voltage. i know first hand they blow if being pushed higher than what's on the datasheet.

now, a 5A trafo is probably too low for a subamp. have you considered using two frafo's in paralell if thats cheaper than a 10amp one?

the amp looks fine, thogh the zoble i see drawn looks like two resistors in series to ground, wich is offcource wrong. i presume you mean the zoble as a R-C link?

Now, as for regulation, for a subamp, this is not only unneeded, but indeed introduces it's own new set of problems. so just trouble and more cast will be the resoult in this case i would say.

a simple regulation design can be found on another of carlosfm's threads.
this thread:
LM338 regulated snubberized PSU for audio amplifiers

good luck!
Marius

[sr2002]

hey thanks alot again,

as i told u i am not using this amp to power a sub!!!!!!!!!!!

i am using it to power regular bookshelf speakers.so will i need and noise filters? i was planin to use the filter given in the attached file. what do u think?

i am building a 2-channel amp based on the br100. that is to boards in parallel with the power supply

thats why i asked u whether 5 amp is sufficient? so a total of 4 lm3886 are there in the circuit.

and the power supply that u sent me is looks really complex. do u have anything much simple than that. wut if i use two trafos in series?

and that calosfm has written somethin below "add caps to chips psu pins" what does that mean?

[sr2002]

hey ,

wut do u think of this power supply? and i think i'll use 20v trafos to be on the safer side

hey and wut if i connect the 2 trafos. as u said instead of one, and wut if one trafo. is like is 22v and other is 20v or something like.

i mean wut if the 2 trafos are not exactly of the same voltage and amps.

will that blow up the power supply

[sr2002]

heres the schematic of the psu

[sr2002]

heloo demogorgon,

r u busy please answer my post man.

[demogorgon]

hey, sr2002, I just uppgraded my pc, but my motherboard didn't come with a seriel port, so i cant use my modem no longer.
(abit an8ultra)

so i'm sitting at a friends place right now, but dont have the time to help you right now. I'l try to get on line tomorrow though.

take care
Marius

[demogorgon]

[B]
as i told u i am not using this amp to power a sub!!!!!!!!!!!

ok, correction taken.

noise filters?

what do u think?

i dont use any, and if the amp is buildt good enough, then it's not needed i would say. mine makes no noise.

Originally posted by sr2002
wut do u think of this power supply? and i think i'll use 20v trafos to be on the safer side

This is the first of carlo's snubbed psu's, use the one he links to here instead.
http://www.diyaudio.com/forums/showt...018#post534018

hey and wut if i connect the 2 trafos. as u said instead of one, and wut if one trafo. is like is 22v and other is 20v or something like.

i mean wut if the 2 trafos are not exactly of the same voltage and amps.

will that blow up the power supply

I havn't tried, but i think the resoult would be spectacular.
(so try to use two identical)

hope this helps you out.

-Marius