[sdiy] headphone amp

[Ryan Williams]

hi,

I was thinking of adding a headphone amplifier and also an attenuator 
for the main output of my modular. this would be a simple little module. 
Can anyone point me to some deccent headphone amplifier schematics? I've 
found a few that seem quite complicated for such a little thing.

Also, about output impedances, I want this module to have a output that 
will hook straight into my computer sound card (for now). Most of the 
synth schematics I've looked at have a small (few hundred ohm) output 
resistor. Is this neccesarry, or would a 1K that I use for every other 
module be ok? (sound card has max input +2.2dbV and > 10k input impedance)

thanks---Ryan