All About Circuits Forum  

Go Back   All About Circuits Forum > Electronics Forums > Homework Help

Notices

Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help.

Reply   Post New Thread
 
Thread Tools Display Modes
  #1  
Old 04-18-2012, 04:30 AM
cyxstudio cyxstudio is offline
New Member
 
Join Date: Apr 2012
Posts: 2
Default how to create a delay in circuit

hi i am completely new to Electronics i need to create a motor circuit that will have a 10 sec delay before the motor starts running when the circuit is close.

i tried to do some google on this and it says a 555 IC and RC circuit will do the job , some says 555 is not needed. but im totally new and i dun understand the sample circuit.

is it really as easy as putting a resistor and capacitor on a series circuit ? using the formula T = R * C to calculate the time delay?

If the answer is no , may someone please show me how it is done. thanks a lot
Reply With Quote
  #2  
Old 04-18-2012, 04:50 AM
Felo Felo is offline
Member
 
Join Date: Feb 2012
Location: Santiago, Chile
Posts: 91
Default

Making RC based delay circuits it very straightforward, but in the real world, components have some tolerance, the more the time you are trying to achieve, the more error you get due to component tolerance, anyway, 10 or so secs are very much tolerable with a 555, should you need more presicion, I would recomend going MCU
Reply With Quote
  #3  
Old 04-18-2012, 05:29 AM
whale's Avatar
whale whale is offline
Senior Member
 
Join Date: Dec 2008
Location: chennai,india
Posts: 111
Default

Time delay can be achieved easily by using RC circuits, 555 IC circuits or by using programmable digital electronics. The critical thing in your project is to switch the motor on after the time delay – direct switching by using relay may lead to spark and may spoil your switching circuit due to high inrush current. In case your motor is permanent magnet motor, this may demagnetize your magnet.
Which type of motor you use?.
Reply With Quote
  #4  
Old 04-18-2012, 06:49 AM
panic mode's Avatar
panic mode panic mode is offline
Senior Member
 
Join Date: Oct 2011
Location: Mississauga, Ontario
Posts: 1,095
Default

this site seem to do just that
http://www.eleccircuit.com/power-on-...rcuits-by-555/
Reply With Quote
  #5  
Old 04-18-2012, 09:35 AM
cyxstudio cyxstudio is offline
New Member
 
Join Date: Apr 2012
Posts: 2
Default

Quote:
Originally Posted by whale View Post
Time delay can be achieved easily by using RC circuits, 555 IC circuits or by using programmable digital electronics. The critical thing in your project is to switch the motor on after the time delay direct switching by using relay may lead to spark and may spoil your switching circuit due to high inrush current. In case your motor is permanent magnet motor, this may demagnetize your magnet.
Which type of motor you use?.
yes DC permanent magnet brushed motor.....
Reply With Quote
Reply   Post New Thread

Tags
, ,


Related Site Pages
Section Title
Worksheet AC motor control circuits
Worksheet AC motor theory
Textbook AC commutator motors : Ac Motors
Textbook Tesla polyphase induction motors : Ac Motors
Textbook Brushless DC motor : Ac Motors
Worksheet DC motor control circuits
Worksheet DC motor theory
Worksheet Time constant circuits
Worksheet Intermediate electromagnetism and electromagnetic induction
Textbook Fuses : Physics Of Conductors And Insulators


Similar Threads
Thread Thread Starter Forum Replies Last Post
Easiest way to create circuit boards. tronicsrookie General Electronics Chat 14 08-25-2011 05:10 PM
How do I build a time delay circuit (novice) snipershot General Electronics Chat 15 09-30-2010 12:14 PM
Need help with a time delay circuit pblakeney The Projects Forum 3 08-28-2010 02:41 PM
programmable delay circuit nozfet General Electronics Chat 4 02-03-2010 05:07 PM
Need time delay circuit for flasher DanW8KMX The Projects Forum 9 10-25-2009 04:37 AM

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 05:05 AM.


User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin
Copyright ©2000 - 2014, vBulletin Solutions, Inc.