A TDT Amplifier Module J. S. Pezaris Computation and Neural Systems California Institute of Technology, Pasadena, CA 91125, U.S.A. Abstract The design of an amplifier module for use with Tucker-Davis Technologies equipment is presented. This four-channel adjustable gain module is used in neural recordings to amplifiy signals proir to visualization and A/D conversion. The amplifier is low-noise, includes low and high pass filtering, and has settable gains from 1--1000 in factor steps of 1, 2, 5. Fetch PDF of paper John Pezaris, Caltech, Mail Code 216-76, Pasadena, CA 91125, pz (at) vis (dot) caltech (dot) edu, 15 Feburary 2000.