This serene little pocket amp circuit was submitted by MAKE Flickr pool member Abie Ringman.
The Mint-Tin/CMoy headphone amplifier costs around $20 to make and therefore is a very attractive alternative to similar commercial amps which can run upwards of $100. Get more info on this popular project in MAKE Volume 4.

Pocket amp circuit on Flickr – Link

From the pages of MAKE:
Mint-Tin Amp
Mint-Tin Amp MAKE 04 – page 141. Subscribers–read this article now in your digital edition or get MAKE 04 @ the Maker store.

RC4560 based headphone amp
RC4560-based headphone amplifier – Link