Simple headphone amp?

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robinsonb5

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Not directly Amiga related, but maybe one of the many smart people here can give me a hint :)

I have few WaveBlaster cards here, the NEC-branded DB60XG clones, and want to do something useful with them. One I'm going to turn into a "ProjectXG" box, similar to the one I've just sold to Vidchick, once I'm going to install in a Mini-ITX PC, via a USB MIDI interface and internal audio header, and the last one I want to turn into an external MIDI tone module.

The digital side of the electronics is dead easy, I can do that in my sleep, and I can bring the audio from the card to a line-out socket easily enough. What I'd like to do, though, is add a headphone socket. The card can't drive headphones directly, so I'll need some kind of amplifier, and the analogue electronics involved are a bit of a closed book to me!

Can anyone suggest a suitable IC and circuit to use for this purpose? (I seem to remember when I started trying to get my head around op-amps 6 or 7 years back I found the sheer number of different types available quite bewildering - how on earth do you pick one from so many!)

Anyhow, I have +/-12v power rails available, and just want a basic stereo headphone amp with volume control, but using as few supporting components as possible. (I'll be using stripboard, and want to keep the footprint to a minimum.)
 
How about dismantle a pair of cheap pc speakers (one with a headphone jack, of course) and use it?
 
There is something.. "FIIO E3" (google it..) price is around 5-7£ real small
 
a small transistor amp shouldnt be to much work.
here is a simple enough one that should be able to be pretty small



audioa13.gif
This may be better suited though
audioa12.gif

http://www.techlib.com/electronics/audioamps.html
 
or an LM1877 plus some components..
 

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a small transistor amp shouldnt be to much work.
here is a simple enough one that should be able to be pretty small

Thanks for those :) I really need to study that sort of circuit - it annoys me that I have not the foggiest clue *how* that circuit works, or *why* the particular values of resistor and capacitor were chosen!

xc8 said:
or an LM1877 plus some components..

Yeah, I think that's more the kind of thing I had in mind - a very small footprint. Again, though, it annoys me that I have no clue *why* a 1877 rather than any of god knows how many other chips! :))
 
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