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Old 2nd February 2011, 09:18 AM   #1
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Smile BEGINNER need help on a portable amp

I don't know if I'm posting in the rite place i recently post something on Amp class D and they told me to come here, so here I am...

OK I'm just a beginner and don't know how to read schematic i been searching to build a portable amp that would be power by battery and would be small able to fit inside of a project box if possible i just want something small that i could take everywhere.

I don't know if that's possible, but if any body could help me i would like to build it myself i don't have the tools to make the board by my self, i would be buying the one from radio shack, so if anybody can provide the list of what I'm going to need (the exact name please) and second a step by step tutorial, on how to put everything on a radio shack board, if you guys don't want to do the step by step at least the exact name of the list. So would you guys help me on building a portable amplifier for some small speakers or headphones, or if you guys know of a link of a build amp for the small speaker and is cheap, meaning less than $20.
It would help is we both have the same board and and you guys putting the component one by one and taking picture of if then i could just count the holes and ill go base on that.
Well thank you. hope i get a lot of helpful comments.
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Old 2nd February 2011, 10:57 AM   #2
AndrewT is online now AndrewT  Scotland
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Yes, it's possible to get portable power from batteries.

First, let's stress one most important factor efficiency

Everything must be chosen for efficiency.
The battery: power per weight ratio.
The amplifier: power per watt ratio.
The load: output per watt ratio.
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Old 3rd February 2011, 03:16 AM   #3
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Quote:
Originally Posted by AndrewT View Post
Yes, it's possible to get portable power from batteries.

First, let's stress one most important factor efficiency

Everything must be chosen for efficiency.
The battery: power per weight ratio.
The amplifier: power per watt ratio.
The load: output per watt ratio.
Well I would say some three double A battery if not a 9V battery
On the amplifier a LMsomething not sure witch one
And I have a one small surround speaker.
Or what ever you could come up with as long is small portable and pretty cheap.
Thank you so much.
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Old 3rd February 2011, 09:34 AM   #4
AndrewT is online now AndrewT  Scotland
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No, the National LM series are ClassAB. Pq is too high for good life on batteries. Check the datasheet for min and max quiescent current. Check also for the minimum operational voltage.

You need a specialised battery compatible amplifier, probably some kind of high efficiency switching type.
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Old 3rd February 2011, 04:25 PM   #5
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Quote:
Originally Posted by AndrewT View Post
No, the National LM series are ClassAB. Pq is too high for good life on batteries. Check the datasheet for min and max quiescent current. Check also for the minimum operational voltage.

You need a specialised battery compatible amplifier, probably some kind of high efficiency switching type.
Ok thank you for your comments.
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