Some secrets of ne5534.
https://s-audio.systems/blog/ne5534/?lang=en
https://s-audio.systems/blog/ne5534/?lang=en
For low current noise OPA1642 is much better than OPA1656. Also lower 1/f voltage noise.Opa1612 has very high current noise, opa2210 has the same current noise as 5534a but less voltage noise. With low impedance source 2210 and 5534a are nearly similar knowing that my 10k input resistance dominates the voltage noise
This one : https://www.waynekirkwood.com/image...gh_Performance_Siliconix_AN81-3_July_1983.pdf ?Siliconix has an application note of 5534. Any one knows where to find?