[EE] Placement of LED resistor

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[EE] Placement of LED resistor

Lindy Mayfield-4
Hello,

In what circumstances does it matter if a current resisting LED resistor is attached between positive source to LED anode or from LED cathode to ground?

Thanks very much!
Kind regards,
Lindy

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Re: [EE] Placement of LED resistor

Isaac Marino Bavaresco-2
It doesn't matter at all. Unless it is for mechanical purposes.
Electrically is doesn't make any difference.

Cheers,

Isaac


Em 26/05/2020 14:24, Lindy Mayfield escreveu:
> Hello,
>
> In what circumstances does it matter if a current resisting LED resistor is attached between positive source to LED anode or from LED cathode to ground?
>
> Thanks very much!
> Kind regards,
> Lindy
>

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Re: [EE] Placement of LED resistor

Denny Esterline-2
In reply to this post by Lindy Mayfield-4
In normal, everyday operation - it does not matter at all.

There are some unusual corner cases where it might matter, but frankly, if
you're asking the question, those corner cases are outside your scope.
I'm thinking things like multiplexed pin functionality, short circuit
planning, etc.


On Tue, May 26, 2020 at 10:25 AM Lindy Mayfield <[hidden email]>
wrote:

> Hello,
>
> In what circumstances does it matter if a current resisting LED resistor
> is attached between positive source to LED anode or from LED cathode to
> ground?
>
> Thanks very much!
> Kind regards,
> Lindy
>
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> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
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RE: [EE] Placement of LED resistor

Lindy Mayfield-4
Thank you.  

Would any sort of LED strip be a corner case?  

/Lindy

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Denny Esterline
Sent: tiistai 26. toukokuuta 2020 20.44
To: Microcontroller discussion list - Public. <[hidden email]>
Subject: Re: [EE] Placement of LED resistor

EXTERNAL

In normal, everyday operation - it does not matter at all.

There are some unusual corner cases where it might matter, but frankly, if you're asking the question, those corner cases are outside your scope.
I'm thinking things like multiplexed pin functionality, short circuit planning, etc.


On Tue, May 26, 2020 at 10:25 AM Lindy Mayfield <[hidden email]>
wrote:

> Hello,
>
> In what circumstances does it matter if a current resisting LED
> resistor is attached between positive source to LED anode or from LED
> cathode to ground?
>
> Thanks very much!
> Kind regards,
> Lindy
>
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Re: [EE] Placement of LED resistor

Denny Esterline-2
Hmmm... I'm thinking the question might be missing a detail.
Every LED strip I've used has had its current limiting resistor(s)
integrated on the strip such that this whole question would be irrelevant.

Is there something more than jut LED strip and a 12v source here?

-Denny


On Tue, May 26, 2020 at 11:00 AM Lindy Mayfield <[hidden email]>
wrote:

> Thank you.
>
> Would any sort of LED strip be a corner case?
>
> /Lindy
>
>
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Re: [EE] Placement of LED resistor

RussellMc
>
> The answers so far are correct PROVIDE THAT there are no other connections
> made to the point between the LED and resistor.


If there is any electrical connection at the midpoint to any other part of
the circuitry then the order will probably matter.

A circuit and/or complete desription would help.


            Russell


>
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