I have just built my first 8 port 595 on strip board with an indicator LED on each channel. When the channel is turned off, the LED still has a faint glow. I have not got around to adding the TRIACS and looking at what the lights are doing but should I be worried about the LEDS or is this normal?
The actual circuit is being driven/sunk by a ULN2803 through a MOC3021 opto, to the LED, a 240ohm resistor and then the 5V supply.
I am getting my power from the USB port.