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Missing Pulse Detetor

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beckhamho

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Hi all,

I am designing a missing pulse detector.
below is the schematic.



The incoming signal is about 950Hz. The pulse width is about 600uS and the pause between pulse is 480uS.

As i know the width of this output pulse is defined by the values of R2 and C1. R2 and C1 must be chosen such that the output pulse width is slightly greater than the time between each incoming pulse.

So for my case, R2 and C1 must be adjusted to be more than 600uS?

anyone can suggest a suitable R1 an C1 for me.

Thanks
 

Hi,
On Time of 555 timer is given by Ton = 1.1R2*C1. Hence selecting values for R2 = 1.2k and C1 = .47uf, gives 620.4uS. Other combinations you may try
R2 = 5.6k, C2 = .1uf gives 616uS
R2 = 2.7k, C2 = .22uf gives 653.4uS.
Hope this helps...
 

Delay the pulse by 1 cycle (shift register) and then AND the input pulse with the delayed pulse. This circuit will work for any clock speed.
 

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