Previous in Forum: Cheated by the Electric Company?   Next in Forum: Lightning Protection
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
12 comments
Rate Comments: Nested
kaos91
Member

Join Date: Jul 2009
Posts: 6

Where Does the +5V Rail Go?

09/18/2009 5:56 AM

can any1 explain where the +5v rail goes?

i know the 12v goes to pin 9 of the db9 which connects to pin 16 of the j1962

http://www.obddiag.net/allpro.html
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Mitsurati
Commentator

Join Date: Mar 2009
Location: Southern California
Posts: 97
Good Answers: 15
#1

Re: Where Does the +5V Rail Go?

09/19/2009 1:47 AM

Are you asking which DB9 pin the +5V goes to? Doesn't. OBD-II only needs +12V from the vehicle system, so there isn't any need for a +5V line. Or are you asking something else?
Register to Reply
kaos91
Member

Join Date: Jul 2009
Posts: 6
#4
In reply to #1

Re: Where Does the +5V Rail Go?

09/19/2009 5:12 AM

this circuit shows +5v rails go to the website to have a clearer look
Register to Reply
Andy Germany
Guru
Popular Science - Weaponology - New Member Safety - ESD - New Member Hobbies - Fishing - New Member

Join Date: Sep 2006
Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E
Posts: 17996
Good Answers: 200
#2

Re: Where Does the +5V Rail Go?

09/19/2009 4:53 AM

Diagram is (as usual) as good as unreadable on CR4. Do you have the possibility to post it on another page where anyone can look at it? Facebook for example.

__________________
 "What others say about you reveals more about them, than it does you." Anon.
Register to Reply
kaos91
Member

Join Date: Jul 2009
Posts: 6
#3
In reply to #2

Re: Where Does the +5V Rail Go?

09/19/2009 5:07 AM

ive given the website on the bottom
Register to Reply
Andy Germany
Guru
Popular Science - Weaponology - New Member Safety - ESD - New Member Hobbies - Fishing - New Member

Join Date: Sep 2006
Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E
Posts: 17996
Good Answers: 200
#6
In reply to #3

Re: Where Does the +5V Rail Go?

09/19/2009 8:23 AM

I have found the circuit diagram after searching around, it would have been most polite to have supplied the exact link.......

By the way, are you trying to build this without buying a kit? The kit would have the PCB and be correctly laid out for all the voltages used.....

I will assume that the USB cable supplies the 5 volts for all the chips.....this is fairly normal.

It is generally cheaper to buy a complete kit than to buy the individual components. In the kit will be a correctly made PCB too.

__________________
 "What others say about you reveals more about them, than it does you." Anon.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
Sciesis2
Guru
Hobbies - HAM Radio - New Member

Join Date: Oct 2006
Location: Vancouver (not BC) Washington (not DC) US of A
Posts: 1261
Good Answers: 12
#10
In reply to #3

Re: Where Does the +5V Rail Go?

09/23/2009 1:16 AM

The bottom of what?? I have yet to see a web site.
Register to Reply
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#11
In reply to #10

Re: Where Does the +5V Rail Go?

09/23/2009 6:25 AM

The bottom of the original post:-

http://www.obddiag.net/allpro.html

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply Off Topic (Score 5)
Haajee
Guru

Join Date: Feb 2006
Posts: 1758
Good Answers: 6
#5

Re: Where Does the +5V Rail Go?

09/19/2009 6:57 AM

Regards

The device is for 12 /24V systems as shown by the manufacturer so it semms that it is erroneousl marked +5V instead of +12V.
Register to Reply
Electronic Wiz
Power-User

Join Date: Dec 2008
Location: Western Colorado, USA
Posts: 202
Good Answers: 16
#7

Re: Where Does the +5V Rail Go?

09/20/2009 4:22 PM

The +5 volts is being supplied by the USB connector, J1. This is mentioned in the paragraph entitled HARDWARE in the link provided. The 12 volt source is generated onboard from the +5 volt power bus. I think this answers your question.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
Andy Germany
Guru
Popular Science - Weaponology - New Member Safety - ESD - New Member Hobbies - Fishing - New Member

Join Date: Sep 2006
Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E
Posts: 17996
Good Answers: 200
#8
In reply to #7

Re: Where Does the +5V Rail Go?

09/20/2009 4:33 PM

I said the same in my post #6 that the USB supplied the 5 volts......there was no 5 volt regulator on the PCB......was my method of finding that out.

__________________
 "What others say about you reveals more about them, than it does you." Anon.
Register to Reply
Randall
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 5826
Good Answers: 322
#9

Re: Where Does the +5V Rail Go?

09/21/2009 3:12 AM

I don't understand the question. The 5V supply comes from the USB connector shown in red and goes to several places shown in blue.

The 12V used on the board is taken from the vehicles battery via a signal diode connected to the DB9 pin 9.

__________________
 If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
Register to Reply
maveric_manic
Guru
Hobbies - Musician - Tube Amps Only Please!

Join Date: Apr 2009
Location: Los Angeles, California USA
Posts: 553
Good Answers: 1
#12

Re: Where Does the +5V Rail Go?

10/26/2009 11:39 PM

I can't read this thing!

__________________
 Regards, Maveric Manic - 'Knowledge is Power and Wisdom is knowing how to use it'
Register to Reply
Register to Reply
Have a Different Question?
12 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Andy Germany (3); Electronic Wiz (1); Haajee (1); kaos91 (2); maveric_manic (1); Mitsurati (1); Randall (2); Sciesis2 (1)

Previous in Forum: Cheated by the Electric Company?   Next in Forum: Lightning Protection
You might be interested in: Rail Services, Height Gages, PIN Diodes

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (87 right now)
Show Members
Advertisement