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 19:44 :: BradtheRad :: Replies: 3 :: Views: 294
Hi guys. I'm new here so a little back'ground. I'm an automotive mechanic with a background in automotive electronics. that being said I'm working on a project and while I do work on automotive components this goes a little deeper than I ever need to go. I need a component that I can momentarily trigger to energize a relay for 5 seconds. I hav
Elementary Electronic Questions :: 10-30-2012 00:06 :: newb12 :: Replies: 7 :: Views: 474
I'am new to this forum and know a little about electronics. I''m also thirteen.
I searched the forum for a similar project.Before posting here.But? Could not find any thing to what i need.
I build a astable 555 timer for clocking the time period of 10s appox
five secs (On) five secs (off). Just to learn how the (...)
Professional Hardware and Electronics Design :: 10-13-2011 21:02 :: Ebonic :: Replies: 62 :: Views: 4246
You could use a 555 timer i.c. in the monostable mode.
The output would switch a relay with more than one set of contacts. One set, in parallel with the button contacts, would close and maintain the power until the end of the 3 second pulse - at which time the whole thing is automatically switched off.
The other set of of contacts (...)
Analog Circuit Design :: 05-14-2011 09:23 :: Syncopator :: Replies: 7 :: Views: 7579
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 04:51 :: Tahmid :: Replies: 1 :: Views: 1738
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 :: 06-27-2009 23:54 :: IanP :: Replies: 1 :: Views: 1888
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 06:27 :: barrybear :: Replies: 1 :: Views: 1534
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 04:11 :: mikesmixes :: Replies: 1 :: Views: 2427