I have been researching and designing circuits for High quality home Stereo system. My main sources have been THAT Design notes and Douglas Self books

[Slinger]

HI everyone.
I have spent some time designing my system and have now almost completed the preamp design. I am at the moment looking into a headphone output, and hence looking at various circuits around the bazaars. I came across a simple circuity using THAT 1646 balanced driver amps that looked promising but I am confused as to why the input is connected to the amp sense terminals rather than pin 4 of the amp. Hoping someone can explain why this has been done. I have attached the circuit here for reference

 

[Cal Weldon]

Welcome.

 

[cowanaudio]

G'day, have you seen this: https://www.diyaudio.com/community/threads/simple-class-a-headphone-amp-using-that1646.163544/

 

[Slinger]

Hi and thanks Cowanaudio. Some interesting reading there. I will have a good read on this and then decide if the circuit is OK for my needs. At the moment it seems a little power hungry, but I may be able to find ways around that. Thanks again for the heads up.