(2) Figure 32A illustrates two complete cycles of the
triangular wave input, Ec (dotted curve), and ER. To illustrate the
effect of varying the time constant of the circuit, the input rise
time, and the ER curve during this time, are enlarged and illustrated
for different values of time constants in Figures 32B, 32C, and 32D.
The time constant of the RC circuit in Figure 32B is equal to 20
times the rise time of the input waveform, and the resistor voltage
very closely follows the input waveform. When RC is equal to the
approximately 63 percent of the maximum applied voltage after 1 time
constant (Figure 32C). In Figure 32D, the time constant is equal to
onefifth of the rise time of the applied voltage, and, therefore, ER
only reaches a value of approximately 20 percent of the maximum
applied voltage.
Figure 32. Varying the time constant with triangular
wave input
63
Previous Page
