8 Threads found on edaboard.com: 555 Timer Delay Off
A 555 timer IC is an easy and common way to do what you are describing.
Below is a method which is more or less
When the input goes high, the capacitor begins to charge. After a second it reaches about 1.
Analog Circuit Design :: 08-29-2014 23:44 :: BradtheRad :: Replies: 3 :: Views: 471
Bit tricky using passive components only! but depending on how accurate you need the 5 seconds a 555 timer should give reasonable results... remember to use an extended temp range part for automotive use...
Follow the design of the mono-stable configuration as shown here... h
Elementary Electronic Questions :: 10-30-2012 04:59 :: thunderdantheman :: Replies: 7 :: Views: 606
Welcome to the Wacky World of Electronics! My first thought is that you might have some problems getting this to work reliably with just a 555 as your time reference. First of all, it's very difficult to get accurate time delays of the length you need (9 hours). Over time everything will drift and your circuit won't know if its Saturday mor
Professional Hardware and Electronics Design :: 10-14-2011 14:40 :: barry :: Replies: 62 :: Views: 6061
use monostable circuit!
u can learn more about the 555 timer on thousands of sites on the internet ! and even use/download the program by which u can automatically calculate component values for your required timeout
check this :
Analog Circuit Design :: 05-17-2011 08:34 :: sherazi :: Replies: 7 :: Views: 9666
In the net, you can search the 555 timer tutorial of Tony van Roon. It is clearly mentioned there and you can be clear about 555 timer.
Analog Circuit Design :: 08-09-2009 08:51 :: Tahmid :: Replies: 1 :: Views: 1890
When the compressor stops you have the falling edge of 12V signal that operates the compressor ..
You can use it (through a capacitive coupling) to trig the 555 timer (simple negative edge one-shot) to generate a 2-minute delay ..
Then, you can connect the output of the 555 and the voltage that operates the compressor (...)
Elementary Electronic Questions :: 06-28-2009 03:54 :: IanP :: Replies: 1 :: Views: 2177
Read up on the 555 timer chip. This will give you the delay you need for a small LED to remain alight for say 30 seconds after you close the door. You will have to take a trigger from the courtisey light to activate the 555 timer
Hobby Circuits and Small Projects Problems :: 12-18-2007 11:27 :: barrybear :: Replies: 1 :: Views: 1670
I need to build a simple delay off timer. When the input is triggered (pulse only) the output must go high and stay high for a period of say 1 hour or 4 hours or selectable. When the input is triggered again, the output timing is restarted.
Any idea's? Would a 555 timer work? Not sure about the long (...)
Professional Hardware and Electronics Design :: 11-20-2006 09:11 :: mikesmixes :: Replies: 1 :: Views: 2607