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Offline ocram63_uk  
#1 Posted : 22 September 2023 00:01:12(UTC)
ocram63_uk

United Kingdom   
Joined: 07/01/2015(UTC)
Posts: 704
Location: England, Suffolk
I ordered this LEDs 325745553387 to replace the original light bulbs. This LEDs do not flicker with DCC power. They are a bit too bright though. If I put in series a resistor will it dampen the brightness or not? Thank you
Offline JohnjeanB  
#2 Posted : 22 September 2023 00:12:53(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,209
Location: Paris, France
Hi
I do it all the time (inserting a dimming resistor) because the LEDs become more and more efficient (luminous).
So yes it works, no it does not create flickering (those which include a full wave rectifier - no matter how you connect DC voltage, they will light up.
Cheers
Jean
Offline ocram63_uk  
#3 Posted : 22 September 2023 06:21:20(UTC)
ocram63_uk

United Kingdom   
Joined: 07/01/2015(UTC)
Posts: 704
Location: England, Suffolk
JohnjeanB thank you very much. Which value resistors do you use, start from please? Thank you
Offline JohnjeanB  
#4 Posted : 22 September 2023 09:50:47(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,209
Location: Paris, France
Hi Ocram
It varies depending on the number of LEDs (one dimming resistor per car and their efficiency.
What I did is to order 1/4 W resistors (25 of each value) on ebay with values of 1k, 2,2 K 5.6kOhms for "une bouchée de pain" (costs peanuts)
and so I adapt because I find that too bright a lighting is very unrealistic.
Cheers
Jean
Offline ocram63_uk  
#5 Posted : 22 September 2023 12:24:52(UTC)
ocram63_uk

United Kingdom   
Joined: 07/01/2015(UTC)
Posts: 704
Location: England, Suffolk
Jean, thank you very much.
Marco = Ocram 😊
Offline ocram63_uk  
#6 Posted : 19 November 2023 15:50:18(UTC)
ocram63_uk

United Kingdom   
Joined: 07/01/2015(UTC)
Posts: 704
Location: England, Suffolk
some time has gone by and here I am again. PROBLEM One coach converted to LED lights and a 5.6 K Ohm resistor works nicely.
I have converted another coach, same setting and components but the LEDs with the 5.6 KOhm resistor in series do not light up. As a matter of fact they do not light up with any resistor. Direct power from pickup shoe, they work.
I tested with a multimeter each resistor and they work and show correct values.
Why do you think these ones do not work? Ideas?m
Thank you
Offline kiwiAlan  
#7 Posted : 19 November 2023 17:25:22(UTC)
kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,137
Location: ENGLAND, Didcot
Originally Posted by: ocram63_uk Go to Quoted Post
some time has gone by and here I am again. PROBLEM One coach converted to LED lights and a 5.6 K Ohm resistor works nicely.
I have converted another coach, same setting and components but the LEDs with the 5.6 KOhm resistor in series do not light up. As a matter of fact they do not light up with any resistor. Direct power from pickup shoe, they work.
I tested with a multimeter each resistor and they work and show correct values.
Why do you think these ones do not work? Ideas?m
Thank you


What sort of lights are you using, as in how many LEDs in a string? I suspect that the number of LEDs in the string is too many, or the string has some other means of dropping the voltage, and an additional 5k6 is just too much to get any current to light them.

And how is this string different from the first coach you did?

Offline ocram63_uk  
#8 Posted : 19 November 2023 18:26:47(UTC)
ocram63_uk

United Kingdom   
Joined: 07/01/2015(UTC)
Posts: 704
Location: England, Suffolk
there are 3 LEDs in-line. There isn't anything hidden between them as I re-did the cabling in a more tidy way. By themselves, no resistor, they light up very brightly. These are the LEDs I have bought: 325745553387
The light holders are the vintage Marklin metallic ones made for tin plate coaches, they already were in the coach. Marklin catalogue 7077
Offline JohnjeanB  
#9 Posted : 19 November 2023 18:53:21(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,209
Location: Paris, France
Hi
Not sure here but you must use a full wave rectifier so that any voltage will light the LEDs, otherwise in DC, in one direction the LEDs won't light up and in AC you will have flickering and half the lighting power
Cheers
Jean
Offline ocram63_uk  
#10 Posted : 19 November 2023 19:09:49(UTC)
ocram63_uk

United Kingdom   
Joined: 07/01/2015(UTC)
Posts: 704
Location: England, Suffolk
I'm using DCC. Why one coach works brilliantly and this one doesn't. This is my conundrum 🙄
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