|View single post by David Elvy|
|Posted: Tue Jul 25th, 2017 01:49 am||
|I am not an expert,
but I have never worried about which end of a resistor is the input end,
and I have never had any problems.
I don't see any reason why you shouldn't be able to reuse the resistor,
so long as the output from the decoder doesn't exceed the voltage the LED would normally get from the track.
I am replacing the LEDs with bi-colour ones,
so I have a red at the rear and white at the front.
The LEDs I have purchased come with a resistor,
I will check the rating of the existing and new and advise if they differ.