. Electronic apparatus for biological research . /so/ Vg-k Vg-k Variable-^ Normal grid Variable-^ grid valve characteristic characteristic Figure Figure input signal is large enough to sweep over an appreciable proportion of this curve, the output of a variable /n stage is distorted. However, if the signal is small enough only a short piece of the curve is used and this may be regarded as being straight. Use of this fact may be made in the Wien bridge oscillator. In Figure , part of the output is tapped off and shunt rectified by the small diode in the second valve to produce
. Electronic apparatus for biological research . /so/ Vg-k Vg-k Variable-^ Normal grid Variable-^ grid valve characteristic characteristic Figure Figure input signal is large enough to sweep over an appreciable proportion of this curve, the output of a variable /n stage is distorted. However, if the signal is small enough only a short piece of the curve is used and this may be regarded as being straight. Use of this fact may be made in the Wien bridge oscillator. In Figure , part of the output is tapped off and shunt rectified by the small diode in the second valve to produce a negative bias which controls the gain of the first valve. The capacitance of C^ has to be sufficiently large for its reactance to be negligible compared with the frequency determining R's and 222
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