There are several applications in which pulses longer than the set width are to be detected, ignoring the other short pulses. We are familiar with the missing pulse detector circuit, which detects the ...

Figure 1 shows a way to control a light (or other 120-V ac appliance) with a passive-infrared (PIR) alarm sensor. The original concept was to turn a closet or shop light on whenever someone went into.

Consider an application that needs a series of pulses to indicate position in which the lack of a pulse “indexes” the count. To achieve that goal, the application uses a rotating, 36-tooth sprocket ...