Tuesday 24 December 2019

Help to build a circuit to trigger event only after input signal changes from "1" to "0"


I'd like to build a kind of logic as shown in the picture ,but I can't do it and I really appreciate if someone can help on that. Basically what I'd like to achieve is that when the input signal changes from 1 to 0 it must trigger a switch at last 2-3 seconds and after everything released. The input signal is not synchronous which means that it might last undefined time. Thanks !



signal logic


Thanks to comments and based on the link HandyHowie provided at paragraph "8. More about triggering" as shown in the picture above it looks it might be the right solution ,but I'm not 100% sure. Please let me know if this might do the job.


enter image description here



Answer



Sounds like a job for a 555 timer configured as a monostable, see for example - http://www.doctronics.co.uk/555.htm#monostable


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