well my board has arrived today so I will be starting my build as soon as my parts arrive. I will be substituting a few of components for better quality items.
All the ceramic capacitors will be changed for silver mica or box film types. The tolerances for ceramics are pretty poor and they are quite noisy.
Instead of the TL072 I will be using RC4558. The noise level of this chip is half of the TL072. Out of all the alternatives that are listed on another post that can be used, The RC4558 has the lowest noise level of them all. RC4558 8nV/Hz, tl072 18nV//Hz. The TL062 listed has terrible noise levels. tl062 42nV/Hz, steer clear of this.
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