Making a sub chip amp

Scorper · 23rd May 2005, 05:14 PM

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 · 23rd May 2005, 06:30 PM

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 · 23rd May 2005, 07:39 PM

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 · 24th May 2005, 12:15 AM

scoper, see the datasheet

http://www.alldatasheet.com/datashee...S/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 · 24th May 2005, 12:41 PM

Hi Scorper

Have a look at the disc at:
200 watts Gäjnklon (Gainclone) - BPA200

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

24th May 2005, 12:15 AM	#4
mod_evil diyAudio Member Join Date: Dec 2004 Location: Rio	scoper, see the datasheet http://www.alldatasheet.com/datashee...S/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 __________________ Brazilian Tube Amp Builder.

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23rd May 2005, 06:30 PM	#2
edl diyAudio Member Join Date: Oct 2004	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.

23rd May 2005, 07:39 PM	#3
Scorper diyAudio Member Join Date: Jun 2003 Location: Finland	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.

24th May 2005, 12:41 PM	#5
tlmadsen diyAudio Member Join Date: Aug 2003 Location: Roskilde - The vikingships	Hi Scorper Have a look at the disc at: 200 watts Gäjnklon (Gainclone) - BPA200 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

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