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Old 30th March 2007, 04:14 AM   #1
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Default 2-4W Stereo Amp

I need to build a stereo audio amplifier that has an output power of around 2 to 4 Watts per channel for an 8 ohm driver. If anyone has any information on how to build this, what IC to use, the external parts, or a schematic, it would be greatly appreciated. I think I can find a good IC, but I don't have any idea how to design a circuit for it. Thanks.
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Old 30th March 2007, 05:10 AM   #2
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4 watts? BAH HUMBUG! Check out my website's projects section and look at the TDA2030 design. There's a 10watt-er for ya! Hope that helps!
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Old 30th March 2007, 11:58 AM   #3
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Alternately you could try TDA2002, very simple chip and good 8watt output.
simple 5 pin IC.
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Old 30th March 2007, 04:23 PM   #4
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Does it matter if my speakers are only rated for 4W max?
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Old 30th March 2007, 04:29 PM   #5
mr.duck is offline mr.duck  United Kingdom
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It should be possible to reduce the power supply voltage to limit how much power can be delivered to the speakers.
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Old 30th March 2007, 11:33 PM   #6
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Thanks for all the help. That TDA2030 looks good. Could someone tell me exaclty what I need to do get an output voltage of 4W or a little less?
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Old 30th March 2007, 11:33 PM   #7
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If I used the TDA2002 would it be stereo? Can someone show me a schematic for about 4W output power per channel? I am new at this, so please bear with me.
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Old 31st March 2007, 11:54 AM   #8
mr.duck is offline mr.duck  United Kingdom
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Look at the data sheet for TDA2030. It will how a typical schematic that you can just copy.

On page 4 see "output power vs supply voltage". The 1st graph show that with a +/-10v supply, the amp can deliver 4 watt into 8 ohms with 0.5% distortion.

The amp can work from +/- 6v supply if you really want to limit output power. But +/-8v should be fine.
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Old 1st April 2007, 03:21 AM   #9
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Yeah the TDA2030 would work, if it had 2 channels. Is there a way I can make it two channels? I doubt there is, so can anyone refer me to any other IC's with 2 channels?
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Old 2nd April 2007, 08:15 PM   #10
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Seach National Semiconductor for a cheap, easy amp in this power range. The LM4954 comes to mind. It is single channel but just get two of them and make a 2-4W amp using batteries if you want. You can get a battery holder from Radio Shack for some AA bateries and that can be your power supply. This is one of the easiest ways to do it. Will sound OK and work fine. Something you might want to look into.

-SL
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