2-4W Stereo Amp

BubbaGump · 30th March 2007, 04:14 AM

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.

DJ Exprice · 30th March 2007, 05:10 AM

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!

abid_rehan · 30th March 2007, 11:58 AM

Alternately you could try TDA2002, very simple chip and good 8watt output.
simple 5 pin IC.

BubbaGump · 30th March 2007, 04:23 PM

Does it matter if my speakers are only rated for 4W max?

mr.duck · 30th March 2007, 04:29 PM

It should be possible to reduce the power supply voltage to limit how much power can be delivered to the speakers.

BubbaGump · 30th March 2007, 11:33 PM

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?

BubbaGump · 30th March 2007, 11:33 PM

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.

mr.duck · 31st March 2007, 11:54 AM

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.

BubbaGump · 1st April 2007, 03:21 AM

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?

SpittinLLama · 2nd April 2007, 08:15 PM

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

30th March 2007, 04:14 AM	#1
BubbaGump diyAudio Member Join Date: Mar 2007	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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30th March 2007, 05:10 AM	#2
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	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!

30th March 2007, 11:58 AM	#3
abid_rehan diyAudio Member Join Date: Mar 2007	Alternately you could try TDA2002, very simple chip and good 8watt output. simple 5 pin IC.

30th March 2007, 04:23 PM	#4
BubbaGump diyAudio Member Join Date: Mar 2007	Does it matter if my speakers are only rated for 4W max?

30th March 2007, 04:29 PM	#5
mr.duck diyAudio Member Join Date: Jun 2006	It should be possible to reduce the power supply voltage to limit how much power can be delivered to the speakers.

30th March 2007, 11:33 PM	#6
BubbaGump diyAudio Member Join Date: Mar 2007	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?

31st March 2007, 11:54 AM	#8
mr.duck diyAudio Member Join Date: Jun 2006	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.

1st April 2007, 03:21 AM	#9
BubbaGump diyAudio Member Join Date: Mar 2007	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?

2nd April 2007, 08:15 PM	#10
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	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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