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Old 23rd September 2002, 07:28 PM   #1
MtBiker is offline MtBiker  United States
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Default Need advice on <10W amp for computer speakers

I need some advice on how to go about building a very small low power amp for some actively crossed computer speakers. So opamp V gain and ? I gain. Go discrete? Use TO220 buffers? Looking to get 1-10W of power. Remember, this is 4 channels so size is important.

TIA
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Old 23rd September 2002, 07:46 PM   #2
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Default Re: Need advice on <10W amp for computer speakers

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Originally posted by MtBiker
I need some advice on how to go about building a very small low power amp for some actively crossed computer speakers. So opamp V gain and ? I gain. Go discrete? Use TO220 buffers? Looking to get 1-10W of power. Remember, this is 4 channels so size is important.
If size is important, then I think the natural choice would be a power opamp such as the National LM3875 (the device used in the 47 Lab Gaincard).

se
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Old 23rd September 2002, 07:57 PM   #3
UrSv is offline UrSv  Sweden
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If you need 4 channels and it is for a computer speaker (usually associated with something else than single-ended class A or large budgets) I would try any of the TDA200X amplifiers like TDA2003V. They are reasonably cheep and they give that kind of output. You should be able to build 4 channels on a 100mm * 75 mm board if you think first.

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Old 23rd September 2002, 08:10 PM   #4
joensd is offline joensd  Germany
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hi,
for your power requirements itīd sufficient to use something like a TDA1519w (2*6W amp), TDA1521 (2*12W amp).
With a TDA 1554Q you even have all 4 channels in one chip.(4*11W)
for simple computer speakers thatīs ok.
if you want better sound try "Overture Series": LM1876 (2*20W) or even ,like steve suggested, LM3875,LM3886.
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Old 23rd September 2002, 08:23 PM   #5
djdan is offline djdan  Romania
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You can use " car integrated amplifiers " like TA8210 or similar and supply with +12V direct from computer power supply.
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Old 3rd January 2003, 02:05 AM   #6
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Default LM1876 Footprint

For those making computer speaker amplifiers, the LM1876 is just the right chip -- 2 of these with a couple opamps used as high and low pass filters make an excellent device for powering a couple audax drivers.,<p>This lil bugger has a lot of feet (15), however. I used the same pad size as for the LM3875 which makes them close, but it shouldn't represent a problem. Just clip the image to MSPaint.
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