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Old 23rd May 2005, 05:14 PM   #1
Scorper is offline Scorper  Finland
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Default Making a sub chip amp

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?
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Old 23rd May 2005, 06:30 PM   #2
edl is offline edl  Hungary
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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.
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Old 23rd May 2005, 07:39 PM   #3
Scorper is offline Scorper  Finland
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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.
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Old 24th May 2005, 12:15 AM   #4
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scoper, see the datasheet

With the LM3886 you have this schematic:

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

Thanks, mod_evil
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Old 24th May 2005, 12:41 PM   #5
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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

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