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: 449
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: 579
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: 5694
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: 9194
Hi guys i need a timer relay for my car.
I already browse the forum but still confused.
I need a 555 based power-on and power-off time delay relay(separated circuit).
The time must be adjustable and i need a regulated power supply for the circuit.
I also need to know how to calculate the timing of 555. (...)
Analog Circuit Design :: 07-30-2009 00:57 :: lanz :: Replies: 1 :: Views: 1874
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: 2148
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: 1649
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: 2580