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How to supply power to self made speakers?

I am experienced with playing with earphones once attached 2 pair of ear phone together'
i saw a speaker thought of connecting it to comp.and did so by simply soldering it with jack but realised that energy coming is too low as compared to power of speaker so I want to add a power source but dont know where to how to connect it help me Extra power may be supplied from usb or any battry in future planning to add some more speakers

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ANDY!3 years ago
You can get a mini amp for about $10-15 on eBay.
http://www.ebay.ca/sch/i.html?_trksid=p2050601.m570.l1313.TR0.TRC0.Xmini+amp&_nkw=mini+amp&_sacat=0&_from=R4
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They've worked pretty well for a few of the boomboxes I have built and they're easy to take apart and modify.
iceng3 years ago
When I was a teen, very long ago, I had speakers that needed a DC source to set a magnetic
field through which the voice coil would activate the speaker cone.

Those years selenium bridge rectifiers were beyond my means.

Instead I made four pickle jar rectifiers with a carbon electrode from an old vintage battery and
an aluminum strip in a solution of borax which glowed at night while powering my ancient speaker.

A
Vyger3 years ago
Speakers are powered by the signal coming into them. It is the signal that drives the coils. There is no a separate power source. If the speakers are powered it is by an amplifier, like the others have said. Powered speakers have built in amplifiers. Non powered ones depend on having a strong signal from an amplified source. That's why you need to match the speakers to the amplifier. Big speakers and small amplifier will give you little volume. Big amplifier and small speakers will cause them to blow out.
Xixfas3 years ago
YOu need an AMPLIFIER.
+1