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DIY Headphone AMP, any ideas???
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rdl:
There is some useful info here:

https://tangentsoft.net/audio/cmoy/
wilfred:
There is this one available as a kit from a Silicon Chip magazine (Apr 2011) project. https://tronixlabs.com.au/kits/audio-kits/amplifier-kits/silicon-chip-headphone-amplifier-kit-australia/

http://archive.siliconchip.com.au/cms/A_112409/article.html
http://archive.siliconchip.com.au/cms/gallery/article.html?a=112409&i=2       (schematic)
RES:
http://sound.whsites.net/project113.htm

Impedance   Power (Direct)   120 Ohm Feed
8 Ohms   1.5 W   35 mW
32 Ohms   2.2 W   99 mW
65 Ohms   1.1 W   136 mW
120 Ohms   595 mW   149 mW
300 Ohms   238 mW   121 mW
600 Ohms   119 mW   82 mW
Doctorandus_P:
LME49600 Headphone Amplifier Evaluation Board User's Guide

AN-1768

David Hess:
There are a couple of ways to use individual operational amplifiers in parallel to raise the output current.  Putting them directly in parallel would not be my first choice.

I have used a variation of the circuit shown below for small audio amplifiers.  The common emitter output allows close to rail-to-rail output voltages.  The current feedback output structure allows the use of slower audio amplifiers in audio applications because the fixed voltage gain of the output stage multiplies the operational amplifier's slew rate and full power bandwidth.  The circuit does require some understanding of the theory to get best results however.
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