risp73 said:
Hi, excuse me please for "my english". What I need you can see in attachement.
I do not use LTSpice, attach schematics as .jpg, gif, png, ... please.
Tnx
Hi again!
Don't worry about your English--it's better than what many native speakers use to post on the net. The problem is mostly just that there wasn't enough information to figure out quite what you wanted.
Also, you can safely ignore the .asc files (or you could download LTSpice; it's free from
https://www.linear.com/designtools/software/). The one I posted was the same circuit as what you see in the PNG image that I also posted with it.
As Roff asked, does this need to work only once on power-up, or does it need to work on power-up and then whenever a trigger is received?
Also, what voltage does this need to work on? My circuit is assuming 5V; Roff's uses 12V. However, I think either should work with any voltage from 4.5V to 16V (those are the extreme edges of what a 555 will take)--just make sure that the current-limiting resistors are sized reasonably.
Anyway, here's a circuit that should do either. See the point where S1 goes to the left side of C5? All S1 is, is a normally-open switch to ground, and all it does is pull that point to ground for a brief time to retrigger the circuit. If you only need this to work on power-up, then get rid of C5, R3, R1, and D5, and it should work. (V2 is not a real thing in the real circuit; it just provides a quick voltage spike at 7 seconds to switch S1 to retrigger the circuit in the simulator.)
(Again to the wiser among us: please let risp73 and me know about any mistakes!)
Hope this helps,
Torben