Making a sub chip amp

[Scorper]

I'd need an amplifier for a subwoofer and I was thinking about making two sets of three parallel chips, bridged (LM3886 or LM3875).

I was just wanting to ask, is there any difficulties doing this, and do I need anything special than pots for offset adjustment?

I was thinking for an signal OP amp to invert the signal for the other side.

And what kind of supply voltages should I/could I use for this arrangement?

 

[edl]

Hi!

How many power do you want?
How many power can your sub handle?
What is the coil impedance of the woofer?

A bridged TDA7294 will give you approx. 150W-RMS on 8ohm. Let's see datasheet.

 

[Scorper]

Well this would be for a 10" Peerless XLS, so 150W is in the "low end" but I think it might do the trick. The element has a 4ohm coil (is this going to be a problem?) and it's rated for 250/500W.

 

[mod_evil]

scoper, see the datasheet

http://www.alldatasheet.com/datasheet-pdf/view/STMICROELECTRONICS/TDA7294.html

With the LM3886 you have this schematic: http://www.shine7.com/audio/pa100.htm

Do you want 250w to 500w... why do you not use a Solid Stage amp?

Thanks, mod_evil

 

[tlmadsen]

Hi Scorper

Have a look at the disc at:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=19157&perpage=10&pagenumber=1

but in shoort you can get up to about 200W/8ohm and 350W/4ohm if you have the cooling and PSU for it.

Have Fun

Thomas