Multivibrators and 555 Timer Questions

• Does the 74123 one shot have an internal timing resistor?
• What does the discharge transistor do in the 555 timer circuit?
• What controls the output pulse width of a one shot?
• The internal circuitry of the 555 timer consists of ________, an R-S flip-flop, a transistor switch, an output buffer amplifier, and a voltage divider.
• What is the duty cycle of the waveform at the output of the circuit given below?
• Design a circuit using a 74121 to convert a 33-kHz, 30% duty cycle waveform to a 33-kHz, 60% duty cycle waveform.
• What is the pulse width of the output of a 74123 if an external 4.7-kΩ resistor and a 0.022-µF capacitor are used?
• A monostable 555 timer has the following number of stable states:
• Pulse stretching, time-delay, and pulse generation are all easily accomplished with which type of multivibrator circuit?
• What is the difference between a retriggerable one shot and a nonretriggerable one shot?
• Which of the following is NOT a characteristic of a retriggerable monostable multivibrator?
• With most monostable multivibrators, what is the Q output when no input trigger has occurred?
• The output of the astable circuit ________.
• When a capacitor charges:
• The pulse width out of a one-shot multivibrator increases when the:
• What is another name for a bistable multivibrator?
• A 0.3-µF capacitor has an initial charge of 2.7 V. If it is discharged through a 10-kΩ resistor for 6.5 ms, how much voltage will be left across the capacitor?
• The bistable multivibrator is an R-C flip-flop.
• A single Schmitt trigger inverter is all that is needed to build a simple astable multivibrator.
• In the 74121, which is nonretriggerable, any triggers that come in before the end of the timing cycle are ignored.