I think from my previous post that the circuit I need may be a mono stable 555 timer circuit. I have a question regarding the circuit. If my trigger is +12vdc for 1 second or less would my output from the circuit be the +12vdc for 5 seconds?
No. The amplitude of the output of an ordinary 555 is about 1.2V to 2.5V less than the supply, or 0.1V up to 2.5V above ground, depending on its output current.
A Cmos 555 has an output at the supply voltage or at ground if it dosen't have a load.
I think from my previous post that the circuit I need may be a mono stable 555 timer circuit. I have a question regarding the circuit. If my trigger is +12vdc for 1 second or less would my output from the circuit be the +12vdc for 5 seconds?
A 555 monostable needs a negative-going signal on pin 2 and the voltage at pin 2 must return to being high again before the timeout.
Yes, the output will be high (about +10.5V) during the timeout.