Timer circuit mayhem!

Status
Not open for further replies.

Thread Starter

nmracer

Joined Sep 11, 2011
1
I am attempting to create a very basic circuit to automatically control the fuel system changeover on a vehicle. Essentially, I am trying to start two timers once the ignition is shut off in order to delay the actual engine shut off. In other words, once ignition is off pump 1 runs for another 2 seconds and pump 3 runs for an additional 60 seconds.

Currently I am attempting to hook up two 555 timers but I am not sure if I am understanding the theory correctly. My idea was to hook up the ignition to pin 6 in order to start the timer once voltage was removed and have the output turn on a relay to the appropriate pump for the duration. However, it has come to my attention that the input signal needs to be shorter duration than the output? Does this mean I am unable to use a 555 for this project?
 

bertus

Joined Apr 5, 2008
20,738
Hello,

I am closing this thread as it violates AAC policy and/or safety issues.

Quote:
6. Restricted topics. The following topics are regularly raised however are considered “off-topic” at all times and will results in Your thread being closed without question:

  • Any kind of over-unity devices and systems
  • Automotive modifications
  • Devices designed to electrocute or shock another person
  • LEDs to mains
  • Phone jammers
  • Rail guns and high-energy projectile devices
  • Transformer-less power supplies
This comes from our Tos:
Terms of Service
There will be enough sites where automotive questions can be discussed :
Member selected automotive forums

Bertus
 
Status
Not open for further replies.
Top