I need to make a 7-12 second delay timer, how?!?

For my delay timer, i will need to be able to turn the POWER on/off and activate the timer with a button press. i only dont wanna have to turn the power on/off to reset it. So, i'd have a power switch, and a timer activate/reactivate button. It will activate a reed relay. THANKS!!!!!!!!!!!

sort by: active | newest | oldest
knektek7 years ago
Get a pickaxe 08 or pickaxe 08m ic and program it to when it is turned on, there is a delay. Simples....
absingh knektek4 years ago
I think you are saying right. Picaxa virtual programing software can be useful with picaxa microcontrollers. Good.
huu7 years ago
It seems as though our readers’ interests in cheap lv are nearly unending, so when I saw a few pictures of the brand’s Fall 2010 handbags, I couldn’t wait to share my favorite with you. This lv bag might look like a bit of a throwback, but as long as you don’t pair it with an outfit made entirely of 50s-appropriate garb, there’s no reason that it can’t look sophisticated and modern. From handbags outlet.
xiaopohai7 years ago
Jayefuu7 years ago
In addition to Re-designs comment try adding the term "monostable". If I understand you correctly you want to hit a button then 7-12 seconds later you want a relay activated?

Some questions for you to think about:
How long do you want that relay on for?
Have you considered that you might need 2 555 monostables? 1 to create the delay then 1 to hold the relay on for a set period.
What is it that you're struggling with with the circuits that you've found so far?

(You can hit the reply button in the bottom right of a post so that your comment is inserted under the comment to which you're replying)
sci4me (author)  Jayefuu7 years ago
WAIT!!!!!!!!! i just got a circuit that works!!!!! the only prob is that i have to turn off the power to reset and then it automatically activates but oh well. now how do i thur a constant high into 1 quick pulse??? anyone who knows, TELL ME!!!!! THANKS!!!
sci4me (author)  Jayefuu7 years ago
right, i always forget thats there... lol! anyway, you are correct. and i would need the relay activated for like a second. The circuits i've found so far, well ya see my computer's messed up... my browser... i cant really find many circuits. but from what i have found... well i did find one that was PERFECT except that the output was high at first. so, i hooked up 2 led so i would be sinking and sourcing to the 555 and only the sourcing one lit. when that went out the other did not light. so that didnt work. I did find a simple one on Instructables but i didnt have the right capacitor and i couldn't find one at Radioshack. So thats all my problems with the circuits i've found. Thanks for the help. i'll have to learn a littlt more and maybe ill figure somthing out. THANKS!
sci4me (author) 7 years ago
i have been doing that for a LONG time... sadly it dont work. and since youtube wont seem to work on my computer, im screwed. cant somone give me a good, reliable circuit?!?!?!?!?!?!?!?!?!? THANKS AGAIN
Re-design7 years ago
Google "555 timer". You'll find many circuits. Pick one that will work for you.