. Electronic apparatus for biological research . «1 [(ignore) R\n for TRl Signal source Figure capacitors may be used in this position. The value of the input capacitor Ci may be worked out in similar fashion, from the diagram in Figure Transformer coupling—The total power gain for the amplifier is 29 + 34 = 63 dB's. The low figure obtained from the first stage is attributable to the low value of load presented to the first stage by the second. Matters can be greatly improved by using a transformer to match the stages together, though it should be observed that three R-C coupled

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. Electronic apparatus for biological research . «1 [(ignore) R\n for TRl Signal source Figure capacitors may be used in this position. The value of the input capacitor Ci may be worked out in similar fashion, from the diagram in Figure Transformer coupling—The total power gain for the amplifier is 29 + 34 = 63 dB's. The low figure obtained from the first stage is attributable to the low value of load presented to the first stage by the second. Matters can be greatly improved by using a transformer to match the stages together, though it should be observed that three R-C coupled transistor stages may have the same performance as, but be lighter, smaller and cheaper than, two transformer-coupled stages. The output resistance for TR^ is given by ^0 + ^ReRc R, + Re + R a and lies between R^ (when the source resistance Rq is 00) ^ReRc and /?. + ^6 + Re 687 (when Rq = 0)

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