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Starting electronics
because the product RC is the time constant, τ. This may be
easier for you to remember.
An a.c. voltage divider can be constructed in a different way,
as shown in Figure 5.12. Here the resistor and capacitor are
transposed. What do you think the result will be? Well, the
output signal size now decreases with increasing frequency
— exactly the opposite effect of the a.c. voltage divider of
Figure 5.12
An a.c. voltage divider with the resistor and capacitor transposed
Figure 5.5! All other aspects are the same, however: there is
a constant section below a corner frequency, and a section
where the output signal is zero, as shown in Figure 5.13. Once
again the corner frequency is given by the expression:
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