7 Threads found on edaboard.com: 555 Delay Circuits
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
Electronic Elementary Questions :: 10-30-2012 00:06 :: newb12 :: Replies: 7 :: Views: 447
See LM555 Timer circuits the "2 stage time delay circuit" for the basis of a timer I would use in your application, where you need to set an accurate delay time for catching water drops.
Hobby Circuits and Small Projects Problems :: 02-14-2012 01:43 :: jbike :: Replies: 4 :: Views: 2234
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 is fre
Analog Circuit Design :: 05-14-2011 09:23 :: Syncopator :: Replies: 7 :: Views: 7259
Check for "555-circuits" or 555 timer/555 monostabil multivibrators & even general: triggered timer circuits...., we have such at EdaBoard too...
Simplest solution is for you: per switch loaded serial RC element of 1uF & ca2.7MOhm to basis of a transistor, their Collector/Emitter has your relay...
Electronic Elementary Questions :: 01-17-2010 06:53 :: karesz :: Replies: 3 :: Views: 2773
You may want to describe the intended circuit operation more clearly. To my opinion it's hard to understand either from the circuits or your description.
Generally, introducing a delay in the said range involves capacitors of about 1000 uF. It can be implemented more easily with active parts, either timer circuits with (...)
Hobby Circuits and Small Projects Problems :: 04-25-2009 07:32 :: FvM :: Replies: 6 :: Views: 3144
Single capacitors quite often don't work well as delay circuits ..
Maybe you should consider the very popular 555 timer .. something similar to this:
Hobby Circuits and Small Projects Problems :: 08-13-2006 00:55 :: IanP :: Replies: 8 :: Views: 3406
I need a circuit that shows how to trigger a 555 from a CMOS-level logic source. The 555 must have a 1-hour delay and then a 1-minute alarm. Does anyone have anything like this? Thank you.
Hobby Circuits and Small Projects Problems :: 10-06-2003 20:35 :: captainkirksdog :: Replies: 3 :: Views: 1718