The NFB-16 is a portable headphone amp built in DAC. At two years ago some customers advice me design a portable DAC + amp . But consider the amp design can't support low to 5V power supply, and I don't want design by a chip as the amp, so I can't design at that time.
I always like to try to design this amp as a target , after a lot practices, at last year I design the wide power supply ACSS amp, it can working well at +4 to +36V DC, but in NFB-16 have been limit the highest power supply at +18V DC.
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