. Electronic apparatus for biological research . Pentode output impedance:/? HT- Figure Figure for a triode {R . rJI(R + rj, where R is typically 30,000 Q. and r„ 10,000 Q, giving an output resistance of 7,500 Q. {Figure ). The cathode follower is the nearest approach in electronics to a constant-voltage generator for signals. Advantage of low output impedance—Many of the resistance-capacitance networks we mentioned in Chapter 4, such as the twin T, were analysed on the basis of their being driven from a constant-voltage generator and feeding a load of infinite resistance. The
. Electronic apparatus for biological research . Pentode output impedance:/? HT- Figure Figure for a triode {R . rJI(R + rj, where R is typically 30,000 Q. and r„ 10,000 Q, giving an output resistance of 7,500 Q. {Figure ). The cathode follower is the nearest approach in electronics to a constant-voltage generator for signals. Advantage of low output impedance—Many of the resistance-capacitance networks we mentioned in Chapter 4, such as the twin T, were analysed on the basis of their being driven from a constant-voltage generator and feeding a load of infinite resistance. The nearest we can get to this state of affairs in practice is to work the device between two cathode followers {Figure ). HT+
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