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
RC4560-based headphone amplifier – Link