Electronics > Beginners
A one time timer
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Zero999:
Why use a 555?

Real engineers use a discrete monostable. ;D If the trigger pulse is always shorter than the delay, then R4 and C2 are not needed: R4 should be open and C2 shorted.



EDIT:
I omitted R5, which is required to limit the base current through Q1, when C1 charges. Without it, nearly the full load current will pass through the base, potentially destroying it!
alsetalokin4017:
Real Engineers may use a discrete monostable, but many ordinary people just use what they have available in their junqueboxes.

Brumby:
I have no qualms about using any solution when it is capable of doing the job.  If a 555 can do it - then why not?

Besides ... the 555 has a very well deserved place in history and getting to implement one in a circuit can certainly be considered a right of passage.
james_s:
The 555 is a great part, but that doesn't mean it's the right tool for every job. When talking of delays of several minutes or more, there are better choices.
Brumby:
There may be "better" - but better how?  Are they going to be better for the criteria:

--- Quote from: iamashwin99 on May 29, 2018, 03:09:09 pm ---I dont need it to be precise, anything from 5-8min is acceptable.

--- End quote ---

The thing is - not to get too wound up with the latest and greatest or even some super-duper chip when an entirely satisfactory solution can be had with a 555.

JMHO
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