1445326735900-0

ICs oscillators and filters
voltage divider is dependent on the frequency of the applied
input signal. In particular, there are three clearly distinguishable
sections to this graph, each relating to frequency.
First, above a certain frequency, known as the corner frequency,
the output signal is constant and at its maximum.
Second, at low frequencies (close to 0 Hz) the output is
zero.
Third, between these two sections the output signal varies in
size depending on the applied input signal frequency.
Is this the same for all a.c. voltage dividers of the type shown
in Figure 5.5? Well, let’s repeat the experiment using a different
capacitor for C2, to find out.
Try a 10 nF capacitor and repeat the whole procedure, putting
your results in Table 5.3 and Figure 5.10. Table 5.4 and Figure
5.11 show our results.
Value of C1 Calculated frequency Measured voltage
10 µF 5.8 Hz
1 µF 58 Hz
100 nF 580 Hz
10 nF 5.8 kHz
1 nF 58 kHz
Table 5.3
Results when capacitor C2 is 10 nF
115