Subwoofer Help ? How can i make a subwoofer using just TDA2030A IC?

 

A subwoofer usually refers to the speaker or transducer.

What you need are three components:

1) amplifier
2) low-pass filter
3) low frequency loudspeaker

Add to that the power supply.

 

You need a big magnet and some heavy wire to wind the voice coil. Then attach it to some conical shaped stiff cardboard and fix it to an appropriately shaped metal frame. After building and installing it into an enclosure connect the two wires coming from the voice coil to your TDA2030A and there you have it - a submarine (or boat anchor) that goes woof.

 

Do you want to make the actuall subwoofer cabinet? Or just the amplifier using the TDA IC?
If you want to make the cabinet speaker itself then look it up on google , there are many links and tutorials .

I'm guessing you want to make only the amplifier.
Read the TDA2030A datasheet , there will be a suggested circuit configuration .
http://www.st.com/web/en/resource/technical/document/datasheet/CD00000129.pdf
Typical circuit configuration.

At your signal input you should add a low pass filter , look it up on this forum or here http://www.electronics-tutorials.ws/ how to make a low pass filter .
Make the cutoff point at about 150-250 Hz .

And that's about it . You will need to calculate your input signal and Supply voltage to give you the amount of wattage output on the speaker.

 

18W is rather a low output power to drive a subwoofer speaker. Typically they are at least 50W.