Wiring led with dcc???

Model Railroader Layouts and layout building
1

[V] How can know wich side is the cathode of a Led?

If i wire it the wrong way, will i damage the decoder or the led?

thanks for your help guys…

2

Cathode (negative) is shorter
Anode (positive) is longer

3

If you wire the LED backwards it will simply not light up until it is wired correctly, nothing will be damaged.

4

Don’t forget, you will need a current limiting resistor on that LED or you can damage the decoder. A typical LED draws 1.3 Volts at 75mA or less. A typical decoder’s headlight circuitry puts out 12-14 Volts at 100mA. Most decoder documentation recommends a resistor value of 220 to 270 Ohms, to protect the decoder.