. Electronic apparatus for biological research . Triode output impedance W 2C R-^ra -A/Wât &â ' Figure Figure The input to the first cathode follower can then be derived from some circuit having rather indifferent properties for constant-voltage generation. Similarly the output of the second may be passed on to something having quite a low resistance. Again in Figure , suppose device A is feeding device B via a rather long piece of screened cable having a capacitance between 174

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