Samuel Groner
Well-known member
Hi
In the course of the discussion with a Lab member about another micpreamp design of mine I suggested two new designs specifically designed to be used with the OPA2228. In case there's interest I thought I might share the schematics: [removed]
The second revision skips the interstage coupling capacitor by trimming the residual offset of the first amplifier. The attenuator between the two gain stages may look crude at first but there's in fact not much you can do otherwise if you don't want to resort to excentric external compensation methods (the OPA2228 is not unity gain stable).
[Edit final revision: OPA2228_micpre_r3.pdf]
Samuel
In the course of the discussion with a Lab member about another micpreamp design of mine I suggested two new designs specifically designed to be used with the OPA2228. In case there's interest I thought I might share the schematics: [removed]
The second revision skips the interstage coupling capacitor by trimming the residual offset of the first amplifier. The attenuator between the two gain stages may look crude at first but there's in fact not much you can do otherwise if you don't want to resort to excentric external compensation methods (the OPA2228 is not unity gain stable).
[Edit final revision: OPA2228_micpre_r3.pdf]
Samuel