This isn't my strong point by far so please bear with me!
I have some 5mm blue flashing LEDs 4.5v - 6v operating voltage and my power source is a 12v 1A mains adapter (for CCTV camera) over CAT5e. I want to install an LED to an external junction box used for CCTV camera connections for added visual security. I've got 400 Ohm resistance (resistors) and the LED flashes perfectly for several minutes then stops flashing and goes static. Why does this happen and can you suggest a possible fix please?
FYI - I'm using same LEDs with a 6v AA battery pack and 100 ohm resistor and this setup works perfectly.
Any help and advice gratefully received.