Oldtimer
After several years of use (maybe about 6 hours a week for most weeks I have started to have failures among my DCC Concepts panel mount LED's. So far only the green ones and at this point in time 6 out of 40. As I have many other items on my plate to be completed and these LED's are not at the top of my list, yet. However I am curious, has any body had a similar problem? They have been connected to the Cobalt Digital point motors in accordance with the DCC Concepts connection drawing and fitted with the correct resistor shown there on. I am not looking forward to removing the dead ones and installing new ones (which I have in my repair store) if there is a fault with them.

Why always (so far) only the green ones?

Thanks,
Keith
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m.bryan
What is powering your LEDs?
DCC or DC?

There are a couple of ways to contact LEDs to a Digital - can you point us in the direction of the particular connection diagram you used
Mick
DCCConcepts Tech/Customer support
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AHJAY
*** There will not be any form of fault with the LEDs. it will be the actual real-world supply voltage, the resistor value chosen OR perhaps something related to the power supplies power delivery (ie an unusually spiky DCC system if the power is DCC-supplied)

Once Micks questions are answered, it will be simple for him to diagnose.... and prevent future failures

regards, Ahjay
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Oldtimer
Mick,

The LEDs are powered from the track bus and switched by the IP Digital point motor wired in accordance with the circuitry provided on the DCC concepts site at the time. I'll have to ferret around in my filing system to lay my hands on the actual circuit. So I'll have to get back with the required details.

Thanks and regards,

Keith
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Oldtimer
Finally ferreted around and found the circuit used and also found that my scanner no longer functions!

So I'll try to verbalize what I have based on the IP Digital Owners manual and other notes.
Thus:  DCC to Terminal 1 - to LED
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Oldtimer
Try again Oldtimer!

DCC to Terminal 1 - LED
DCC to Terminal 2 - LED
Frog to Terminal 3 - LED via 2kohm resistor
Push button to Terminal 7
Push button to Terminal 9
Based on the note on the Page 5 of the Cobalt Digital introduction stating that diode are not strictly needed I have not installed these.

Hope the above is clear.

Mnay thanks, Keith
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AHJAY
Hi Keith.

It will depend on the DCC brand but some DCC systems will give quite high spikes at every boot up/short on the layout or even when hitting the reverse button. Irrespective of controller brand, if you are getting failures which are never welcome of course, you have some simple choices.

* Increase the resistor value to say 3 to 5k. this will not give a significant brightness change but will add protection
* Add protection diodes for the LEDS.
* Do both

Personally, given you have some LED failures, I would at least add the diode to protect the LEDS a little more.

regards
Ahjay
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Oldtimer
G'day Ahjay,

Many thanks for the advice. Sounds like I have some many hours of interesting soldering coming up with 80 diodes 40 resistors and sundry other connections over 6 control panels! Oh well one never gets bored with model trains.

regards,

Keith
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