4-57. In a positive-diode counter that provides
accurate counting, what is the only
variable allowed in the input signal?
1. Pulse width
2. Pulse duration
3. Pulse amplitude
4. Pulse-repetition frequency
Figure 4G.Basic frequency counter.
IN ANSWERING QUESTIONS 4-58
THROUGH 4-60, REFER TO FIGURE 4G.
4-58. An input signal to the counter will cause
(a) what capacitor to charge through R1
and D2 and (b) what capacitor to
discharge through D1?
1. (a) C1
2. (a) C1
3. (a) C2
4. (a) C2
4-59. What components produce the smooth dc
1. C1, D1, and R1
2. C1, D2, and R1
3. C1, C2, and R1
4. C2, C3, and R2
4-60. When the input frequency is increased,
what is the effect on (a) the input
interval, (b) the number of pulses per
given time and (c) the dc output voltage?
1. (a) Longer
2. (a) Longer
(b) more (c) lower
3. (a) Shorter
4. (a) Shorter
(b) more (c) higher
Figure 4H.Step-counter frequency divider.
IN ANSWERING QUESTIONS 4-61 AND
4-62, REFER TO FIGURE 4H.
4-61. An output pulse will occur when the
charge on C2
1. builds a magnetic field in the base
2. drops below the cutoff-bias level of
3. exceeds the bias level of Q1
4. reaches the source potential of the
4-62. What component develops the bias for