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-   -   Need advice on <10W amp for computer speakers (http://www.diyaudio.com/forums/solid-state/6257-need-advice-10w-amp-computer-speakers.html)

MtBiker 23rd September 2002 07:28 PM

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

Steve Eddy 23rd September 2002 07:46 PM

Re: Need advice on <10W amp for computer speakers
 
Quote:

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

UrSv 23rd September 2002 07:57 PM

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.

/UrSv

joensd 23rd September 2002 08:10 PM

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.

djdan 23rd September 2002 08:23 PM

You can use " car integrated amplifiers " like TA8210 or similar and supply with +12V direct from computer power supply.

jackinnj 3rd January 2003 02:05 AM

LM1876 Footprint
 
2 Attachment(s)
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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