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Portable speaker project? Answered

Hello I am looking to build a portable speaker with some old speakers I found around my house, powered with batteries.
I want to know how much voltage my speakers need to work, on the speakers casing it says 5 watts and 4 ohms. Is there an equation I can use to find out what the voltage is of my speakers based on the watts and ohms level? 

Based on my research it looks like I will need an audio amplifier, can you suggest a cheap and cost effective audio amplifier and leave the weblink on the comments. 
Please keep the reply basic as in not a tech wizard lol

thank you. 

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-max-
-max-

6 years ago

I would just get a real basic audio amp in a DIP package, for starting out. The LM386 is a good option, it is the first chip I ever used. I think MAKE had a good video showing how to make a small Altoids tin, or something like that. I think Kipkay did something simalar, too.

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-max-
-max-

6 years ago

YES! There are equations you can use to igure stuff like that out!

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-max-
-max-

Answer 6 years ago

figure* (also, make sure to watch it in 1080p60 :P)

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mpilchfamily
mpilchfamily

6 years ago

First of all you don't supply voltage to the speaker. You need to connect them to an amp which will boost the audio signal coming in to a higher level to send out to the speakers.

In your case you'll want to do a google search for a 5W audio amp. If you want to build it yourself then look up a 5W audio amp schematic. The design of the amp itself will determine the voltage needed.

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iceng
iceng

Answer 6 years ago

+1