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Headphone Amplifier Design. Part 2.

Using a 600 ohm headphone as a load                          
1 x 2n3972 current source 2 x 2n4392 input stages & 150 ohm             2 x 2n3972 current source u441 input stages & irf820 as output current sink                                                                              output current sink
                                                                                                   
bias current                      104 mA                                                                   190Ma
midpoint volts                   13.7 v                                                                      12.8 v
level frequency response   14 hz--160 khz                                                         20 hz---80 khz    
p-p v with load                  11 v                                                                         11 v 
audible noise                    none                                                                        none
turn on/turn off thumps  none  but slight dip in output                                          none
during turn on.

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