(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

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