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Old 16th February 2017, 06:43 AM   #1
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Default Help in for a 3 channel amp for computer speakers

Hi,

I currently have a Logitech X220 2.1 Channel Computer Speaker System, but the subwoofer is not working anymore. Both satellite speakers are working great. Just no sound from the subwoofer.

I don't know if I can just replace the faulty amp chip for the subwoofer. I would like your help in finding out which is the best way to go about this.

I looked at ebay and found these in case I have to replace the whole amplifier inside the subwoofer box for a 3 channel amp for my computer computer speakers?.

1. The first has the TDA2030A chip TDA2030A 2.1 3-Channel Subwoofer | eBay

2. The second has the TDA7377 chip TDA7377 2.1 3 Channel Subwoofer | eBay

Any ideas will be welcome.
Please note I don't want to spend too much.

Thank you.
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Old 16th February 2017, 07:35 AM   #2
basi is offline basi  Croatia
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This is so cheap and sounding great!!I made 4 sets for my friends.U just need a good power supply that inculude capacitor bank.

TPA3116D2 2x 50W +100W 2.1 Channel Digital Subwoofer Power Amplifier Board | eBay
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Old 16th February 2017, 09:44 AM   #3
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Quote:
Originally Posted by basi View Post
This is so cheap and sounding great!!I made 4 sets for my friends.U just need a good power supply that inculude capacitor bank.

TPA3116D2 2x 50W +100W 2.1 Channel Digital Subwoofer Power Amplifier Board | eBay
That little mighty amp sure looks awesome. Can you recommend a power supply to go with it?

I have the following that I may be able to use.

How to turn an X-Box 360 PSU into a 12v lab PSU http://www.instructables.com/id/How-to-turn-an-X-Box-360-PSU-into-a-12v-lab-PSU/

I picked this PSU up at a used store and was wondering it this would work with the modification mentioned in the link?
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Old 16th February 2017, 09:51 PM   #4
basi is offline basi  Croatia
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Quote:
Originally Posted by james777 View Post
That little mighty amp sure looks awesome. Can you recommend a power supply to go with it?

I have the following that I may be able to use.

How to turn an X-Box 360 PSU into a 12v lab PSU http://www.instructables.com/id/How-to-turn-an-X-Box-360-PSU-into-a-12v-lab-PSU/

I picked this PSU up at a used store and was wondering it this would work with the modification mentioned in the link?
Will work on 12v but the power will be weak,i will say about 18-22v would be ideal...
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Old 17th February 2017, 02:12 AM   #5
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Quote:
Originally Posted by basi View Post
Will work on 12v but the power will be weak,i will say about 18-22v would be ideal...
Do you know how much output power I can get at 12 volts?

Also can you recommend a suitable PSU that is18-22v?

Thank you.
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Old 17th February 2017, 07:43 AM   #6
basi is offline basi  Croatia
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Quote:
Originally Posted by james777 View Post
Do you know how much output power I can get at 12 volts?

Also can you recommend a suitable PSU that is18-22v?

Thank you.
Maybe around 2x15w and sub 30w in 12v...I use transformer around 15vac(21vdc)100va and two 6800 uf caps.That works like a charm.
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Old 17th February 2017, 08:51 PM   #7
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Quote:
Originally Posted by basi View Post
Maybe around 2x15w and sub 30w in 12v...I use transformer around 15vac(21vdc)100va and two 6800 uf caps.That works like a charm.
Thanks for the info. I was wondering how much amps does the power supply need to output?

One other question, can I use a regular psu that puts out 12-24 volts dc, or do I have to get one of those expensive switching supplies?

I went ahead and placed the order for the amp unit on ebay from the link that you have provided. So I'm looking forward to getting that up and running.
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Old 17th February 2017, 08:58 PM   #8
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Quote:
Originally Posted by basi View Post
Maybe around 2x15w and sub 30w in 12v...I use transformer around 15vac(21vdc)100va and two 6800 uf caps.That works like a charm.
That's not too bad for 12v dc.
Can I use a regular dc power supply that supplies 12-24 volts, or do I have to use one of those expensive switching power supplies? Also do you know how much amps the psu must supply?

I went ahead and ordered the amp from the link that you provided, so I'm looking forward to getting that up and running.
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Old 18th February 2017, 08:09 AM   #9
basi is offline basi  Croatia
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Quote:
Originally Posted by james777 View Post
That's not too bad for 12v dc.
Can I use a regular dc power supply that supplies 12-24 volts, or do I have to use one of those expensive switching power supplies? Also do you know how much amps the psu must supply?

I went ahead and ordered the amp from the link that you provided, so I'm looking forward to getting that up and running.
The bigger the better. Around 100va to 200va would be good.As i say in previous post working on 100va transformer like a charm.
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Old 18th February 2017, 09:35 AM   #10
AndrewT is offline AndrewT  Scotland
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the maximum AC output from a 12Vdc supply is ~4Vac when the load is high impedance.
As the load impedance goes down the maximum output voltage drops a bit.

If you bridge two amplifiers you can double that output voltage. But the amps see half the load impedance and so the voltage drops a bit more.

Two bridged amplifiers fed from 12Vdc will give ~ 8W into 8ohms. Pmax = (4Vac+4Vac)^2 / 8ohms
If each of the bridged amplifiers can drive a 2ohms reactive speaker load, then you can get about 13W into 4ohms. Pmax = (3.6Vac+3.6Vac)^2 / 4ohms

When you double the supply voltage you get roughly 4 times the maximum power output. i.e. a bridged pair of 2ohms capable amplifiers fed from 24Vdc will give a maximum output of ~ 50W into 4ohms.
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Last edited by AndrewT; 18th February 2017 at 09:39 AM.
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