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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A retriggerableOS can be used as a pulse-frequency detector that detects when the frequency of a pulse input is below a predetermined value. A simple example of this application is shown in Figure 5-85. The operation begins by momentarily closing switch SW1.
(a) Describe how the circuit responds to input frequencies above 1 kHz.
(b) Describe how the circuit responds to input frequencies below 1 kHz.
(c) How would you modify the circuit to detect when the input frequency drops below 50 kHz?

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