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Old 17th April 2012, 08:02 AM   #1
diyAudio Member
Join Date: Apr 2012
Talking First amp. Need lots of help


antec earthwatts 430w atx psu (12v 360w max)

3x tda2030
dual 7173k on pcb from old car stereo

lots of enclosures, wire, speakers, connectors and not much knowledge but lots of determination haha.

Help me?
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Old 17th April 2012, 09:58 AM   #2
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Join Date: Apr 2012
Preferably around 60w
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Old 17th April 2012, 11:02 AM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
tda2030 uses +-6Vdc to +-22Vdc. It is not suitable for a 12Vdc supply.
12Vdc supply limits the absolute maximum output from a Power Amplifier to ~3Vac.

3Vac into 8r0 is ~ 1.1W
3Vac into 4r0 is ~ 2.2W
3Vac into 2r0 is ~ 4.5W
3Vac into 1r0 is ~ 9W

Which of those chips can drive an 8ohm speaker?
Which of those chips can drive an 4ohm speaker?
Which of those chips can drive an 2ohm speaker?
Which of those chips can drive an 1ohm speaker?

If you bridge a pair of Power Amplifiers then the bridged pair can drive a double value load resistance to double the power.
i.e. use a pair of 30W into 4r0 power amps in bridge mode and you have a 60W into 8r0 power amp. Note that both sets of amplifiers deliver the same total power of 60W. You have not gained any extra power.

Now let's assume one of your selected chipamps can drive a 2ohms speaker. Then in bridged mode it can drive a 4ohms speaker.
The absolute maximum power available from 12Vdc is ~4.5W into 2r0.
The absolute maximum power from a bridged pair will be ~9W into 4r0. i.e. you may have created a 9W into 4ohms amplifier.

You cannot get anywhere near your 60W target with chipamps from a 12Vdc supply.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 17th April 2012, 11:59 AM   #4
diyAudio Member
Join Date: Apr 2012
Damn thanks that was alot to help.

Well It doesnt have to be 60w, what about 40? I think i might still have the transformer that got from the same system I got 2030s from.

Im sure I have a pair of 4ohm speakers somewere around here haha..

Oh and last thing, My psu has a -12v rail but with minimal ratings
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Old 17th April 2012, 05:01 PM   #5
johnr66 is offline johnr66  United States
diyAudio Member
Join Date: Mar 2009
You could get 36 watts max from the TDA2030A if you bridge them and have an adequate power supply. The computer supply will not work. If you want more power, I'd suggest an LM3886 kit if this is your first amp. You could build an 18 watt amp with a single TDA2030A if you want to tackle the component layout yourself. Use a bulb tester so you don't blow anything up.
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