Yes, one-shot is the same as monostable.I just bought a 555 timer chip. Is what I described called a Monostable mode of a 555 chip? I am a bit confused by the term one-shot pulse.
Yes, R should have been 160Ω, #12 made an error.I do not understand where some of the numbers came from in the calculation. Why is R 80 when the resister seems to be 160 ohms. What is v0? My DC source is 12 vdc. Should I stick to a resister of 160 ohms and just use a large capacitor? I may have too many questions.
Thanks for you pointed out.There is something very wrong with the circuit in post#13. It has a 5 volt supply and a 12 volt relay coil. It simply won't work unless you reverse the connections. Then adjustment of the resistor values could make it work much like the circuit in post#6. Again, you start out with more voltage than the relay needs and waste some of it to get the delay to work.
The 555 circuit is very much more adjustable with way smaller capacitors. Post your schematic and we'll see if you misplaced something.