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Old 25th June 2012, 01:58 AM   #1
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Join Date: Jun 2012
Default First Amp, where to start?

this is really my first DIY circuit project.
this is what i was thinking:
a dual speaker amp (so an amp with the two speakers)
i also what the amp to have a switch selecting the power source between battery, or wall.

i've looked at some schematics for simple headphone amps, but there are so many different schematics for stereo amps, i don't know which i need.
i also don't know the dangers. for example, if i make a mistake in the amp, could i damage my mp3 player? is there a like a de-amplifyer lowering the voltage going back to the device.

mainly i don't know what my first/next step should be and what schematics i should be following.

i'm sure this sin't the first thread asking for beginner help, you could point me to one (i* didn't find one here). but also my project is slightly unique (i think), so help here would also be appreciated.
thanks
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Old 25th June 2012, 05:23 AM   #2
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Join Date: Jan 2005
LM3875 and LM3886, these are the simplest you can get.

Start off building chipamps, then when you feel your getting the hang of things, read D Self's and Bob Cordells audio amplifier books to learn how power amplifiers work.
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Old 25th June 2012, 06:02 AM   #3
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Tekko's advice is excellent.

As far as power goes, if you are at all unsure of your understanding of AC mains power, you are probably better off either using a "wall wart" (AC/DC adapter) or buying a commercially made power supply. A small chip amp with a suitably sized wall wart will be adequate for relatively sensitive speakers.
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Old 25th June 2012, 07:01 AM   #4
Tajzmaj is offline Tajzmaj  Slovenia
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Join Date: Mar 2011
Location: Ljubljana
Maybe even buy some kit. Something which works with single rail power supply especially if you need to use it with batteries. Otherwise you will need 2 of them. If you don't need a lot of power than TDA2003 is good start.
Cheers, Taj
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