. Electronic apparatus for biological research . o Output 0 control Figure Figure Alternatively, positive feedback may be had by coupling back from the second valve cathode to the first. This may be achieved by the delta resis- tance network of Figure , or the equivalent T form {Figure ). A design employing this principle has been published by Beattie and Conn^. ACCEPTOR AMPLIFIER—NEGATIVE FEEDBACK METHOD Whereas in the positive feedback method we include a band-pass filter in the amplifier, in the negative feedback method we include a null-transmission filter—most convenient
. Electronic apparatus for biological research . o Output 0 control Figure Figure Alternatively, positive feedback may be had by coupling back from the second valve cathode to the first. This may be achieved by the delta resis- tance network of Figure , or the equivalent T form {Figure ). A design employing this principle has been published by Beattie and Conn^. ACCEPTOR AMPLIFIER—NEGATIVE FEEDBACK METHOD Whereas in the positive feedback method we include a band-pass filter in the amplifier, in the negative feedback method we include a null-transmission filter—most conveniently a parallel T—in the feedback loop {Figure ). Away from the null-frequency of the parallel 7" there is 100 per cent negative feedback with a consequent overall gain of only 1. At the null-frequency, the feedback disappears and the gain is A. More precisely we have Fout A Vi in 1 -\- AB 200
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