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First Amp, where to start?
First Amp, where to start?
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Old 25th June 2012, 01:58 AM   #1
jkjkjij22 is offline jkjkjij22
diyAudio Member
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.
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Old 25th June 2012, 05:23 AM   #2
Tekko is offline Tekko
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
ChicagoJTW is offline ChicagoJTW
diyAudio Member
Join Date: Mar 2011
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
diyAudio Member
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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