. Electronic apparatus for biological research . /2Ry >Ri( long tail, R^, as before; and the anti-phase gain—if both outputs be used—is gm^L- As Rj' is increased, cathode follower-like action becomes possible and the anti-phase gain falls. It is clear from the symmetry of the system that the mid-point of Ry must remain at a fixed potential and therefore as far as potential changes are concerned the equivalent circuit of each half is as that shown in Figure We have total gain = j-^-^ 187

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