Headphone Amp based on American Beauty Buffer

[lineup]

This amplifier is based on American Beauty Buffer https://www.diyaudio.com/community/threads/1w-7-components-american-beauty-buffer.331274/
The clever idea is by @diegomj1973

Suitable for 8-64 Ohm headphones.
Distortion is low THD 0.0001%
The +/-12V supply should be well regulated. Use voltage regulators.

 

[Johnloudb]

Very cool circuit Lineup, haven't seen that circuit topology before. No voltage gain here, though you won't need that with a good source driving it. Have you tried your sim with an impedance in front of the amp, to simulate a volume control?

 

[ra7]

Nice. The concept has the vibes of a White cathode follower and JLH but it is neither. Very elegant and zen, if you ask me. My only concern is operating the first 9610 at 2.8 mA, which is very much in the nonlinear area. But it seems to work. Now someone will have to build and make sure the sim matches reality.

 

[diegomj1973]

https://www.diyaudio.com/community/...ican-beauty-buffer.331274/page-3#post-6337531

Reopened!!!

 

[thirdicomplex]

Looks very similar to Broskie's Triadtron topology

 

[jasonRF]

Interesting. How much does the dc offset drift with temperature?

 

[Johnloudb]

Nice. The concept has the vibes of a White cathode follower and JLH but it is neither. Very elegant and zen, if you ask me. My only concern is operating the first 9610 at 2.8 mA, which is very much in the nonlinear area. But it seems to work. Now someone will have to build and make sure the sim matches reality.

Yes, curious how the real circuit measures. I’ve used the IRF9610 in a folded cascode, as the VAS of an amplifier. I got a THD of 0.0034% at 4 volts RMS, no feedback. That stage had +\- 70V rails though, but it did come very close to the sim. Sometimes they do , sometimes horribly off.