this idea is swap input transistor of traditional diamond buffer with jfet
Diamond jfet/bjt headphone buffer
post #2 of 4
3/2/13 at 2:01pm
post #3 of 4
3/2/13 at 5:17pm
actually that schematic has a number of problems.
This is what you want.
and then you can add a servo around it and drive the current source
to maintain 0 volts dc on the output.
performance about .005% thd, and flat to 20khz.