Delay

[_mario]

Hi,
First of all, what i wanna do is to activate a relay for 1 hour but with a 30 sec delay before it.
To activate it for 1h I will use a simple timer, (timer2), i have a + pulse, and need help to build a delay (timer1) that would receive this pulse, wait 30 secs and then repeat the + pulse that would trigger timer2.
I'm novice, so i would like to ask for detailed info, and the time values 30s and 1h are not critical.
Thanks,
Mário

 

[bogdanfirst]

how about using 2 timers. like 555.
the first one gets activated by a pulse and stays on for 30 seconds. then use a transistor, a PNP, to trigger the second timer when the first goes to LOW. think this is simple enough?