This is a design circuit to detecting a missing pulse. This circuit is built by NE555 timer IC connected to detect an abnormally long period between two consecutive pulses in a train of pulses, Such as circuits can be used to detect the intermittent firing of the spark plug of an automobile or to monitor the heart beat of a sick patient. This is a figure of the circuit.
Processing work of the circuit is the signal from the pick up transducer is shaped to form a negative going pulse and is applied to pin 2 of the IC which is connected as a mono stable. As long as the spacing between the pulse is less than the timing interval, the timing cycle is continuously reset by the input pulses and the capacitor is discharged via T1.A decrease in pulse frequency or a missing pulse permits completion of time interval which causes a change in the output level. The circuit can be powered from a 9V battery or 9V DC power supply. The IC1 NE555 could be mounted on a holder.
Processing work of the circuit is the signal from the pick up transducer is shaped to form a negative going pulse and is applied to pin 2 of the IC which is connected as a mono stable. As long as the spacing between the pulse is less than the timing interval, the timing cycle is continuously reset by the input pulses and the capacitor is discharged via T1.A decrease in pulse frequency or a missing pulse permits completion of time interval which causes a change in the output level. The circuit can be powered from a 9V battery or 9V DC power supply. The IC1 NE555 could be mounted on a holder.
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