Thank you Bogdan for your valuable informations.
It is rare to see an amplifier with a flat open loop gain of up to 20 kHz. This prelude to an excellent sound and sound stage of great naturalness and precision, as advocated by John Curl in his various articles. With regard to balanced output, I did not mean a real balanced amplifier with two identical amplifiers per channel but an output with separate grounds (4 pins),which can be obtained with two separate circuits starting from the rectifiers of the power supply. (two amplifiers and two +/- Vcc power supplies) This is preferred by many people to the traditional solution with common ground output due to increased headphone driver control, better low frequency control and separation.
Thank you again and congratulations for the excellent realization.
Semola
It is rare to see an amplifier with a flat open loop gain of up to 20 kHz. This prelude to an excellent sound and sound stage of great naturalness and precision, as advocated by John Curl in his various articles. With regard to balanced output, I did not mean a real balanced amplifier with two identical amplifiers per channel but an output with separate grounds (4 pins),which can be obtained with two separate circuits starting from the rectifiers of the power supply. (two amplifiers and two +/- Vcc power supplies) This is preferred by many people to the traditional solution with common ground output due to increased headphone driver control, better low frequency control and separation.
Thank you again and congratulations for the excellent realization.
Semola
Very good looking measurements and interesting circuit - really promising. Bogdan, thanks for publishing it plus releasing the gerber files. Best, Ernst
You won't know exactly until you listen to him. Probably if an audio guru says something, it MUST be exactly ...
I'm not guru oriented, and made the thing with wide ol bandwidth 'cos I don' t like to see raising distortion with frequency in the audio band, that's all. 😉
