Headphone Amp

[fkm]

I have built the mxr headphone amp and the noisy cricket, but found some others below. It would be great to add a few to the layout library. thanks!

http://www.paulinthelab.com/search?q=headphone
http://www.paulinthelab.com/2013/12/mp3-headphone-amplifier-tda2822m.html
http://wiringstages.blogspot.jp/2013/12/portable-9v-headphone-amplifier.html