. Electronic apparatus for biological research . Transistor 1 Transistor 2 Figure circuits the position is reversed. The output impedance of a transistor stage is larger than the input impedance of the stage which follows it, and under these conditions the arrangement of Figure gives poor control; a better scheme is shown in Figure , and this is the one usually used. It has another important advantage: the transistor is essentially a current- controlled device. It is the input current, not the input voltage, which is accurately amplified. The input resistance is that of a diod
. Electronic apparatus for biological research . Transistor 1 Transistor 2 Figure circuits the position is reversed. The output impedance of a transistor stage is larger than the input impedance of the stage which follows it, and under these conditions the arrangement of Figure gives poor control; a better scheme is shown in Figure , and this is the one usually used. It has another important advantage: the transistor is essentially a current- controlled device. It is the input current, not the input voltage, which is accurately amplified. The input resistance is that of a diode biased in the forward direction and is highly non-linear. Thus if a transistor be fed from 695
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