Previous in Forum: UPS   Next in Forum: Light weight induction motor
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
4 comments
Rate Comments: Nested
SAN00
Active Contributor

Join Date: Feb 2008
Posts: 12

Using LEDs with a PNP Proximity Sensor

01/13/2009 10:01 AM

Hello friends,

I want to glow one 24V DC LED on output supply voltage of PNP proximity sensor. i.e. when proxi get switched, LED will glow. I tried by giving o/p of proxi to led & negative of DC;but failed. Help for this problem will be highly apreciated.

Thanks in advance..
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!
caramba
Guru
Engineering Fields - Instrumentation Engineering - New Member Hobbies - Fishing - New Member

Join Date: Jan 2008
Location: Kazakhstan
Posts: 753
Good Answers: 8
#1

Re: Using LEDs with a PNP Proximity Sensor

01/13/2009 10:33 AM

Here's conventional scheme for PNP sensor. I'm supposing you have something like. Are you sure the LED fits to 24V? If you're not, try out ballast resistor (shown as phantom).
Register to Reply
JohnDG
Guru
United Kingdom - Member - Not a New Member Hobbies - Musician - New Member Hobbies - Fishing - New Member

Join Date: May 2006
Location: Reading, Berkshire, UK. Going under cover.
Posts: 9684
Good Answers: 468
#2
In reply to #1

Re: Using LEDs with a PNP Proximity Sensor

01/13/2009 11:28 AM

caramba, I think you'll find your LED is the wrong way round - it must be conducting (forward biased) to light up.

__________________
 "Love justice, you who rule the world" - Dante Alighieri
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
caramba
Guru
Engineering Fields - Instrumentation Engineering - New Member Hobbies - Fishing - New Member

Join Date: Jan 2008
Location: Kazakhstan
Posts: 753
Good Answers: 8
#3
In reply to #2

Re: Using LEDs with a PNP Proximity Sensor

01/13/2009 11:47 AM

Oh Yes, JohnDG. You're absolutely right. I was mistaken with polarity as I used to work only with NPN sensors in my last projects. Thanks you've corrected me.

So hope it's right?
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
SAN00
Active Contributor

Join Date: Feb 2008
Posts: 12
#4
In reply to #1

Re: Using LEDs with a PNP Proximity Sensor

01/14/2009 10:13 AM

yes sir,

These leds are of 24volts; working well with DC supply.
Register to Reply
Register to Reply
Have a Different Question?
4 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:

caramba (2); JohnDG (1); SAN00 (1)

Previous in Forum: UPS   Next in Forum: Light weight induction motor

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 (72 right now)
Show Members
Advertisement