aahhh 270ohm is far too low for 12v.
should be 560ohm (for 20mA) or upto 820ohm/1k for longer lasting.
MM.
Yes, 560+ ohms for 20mA forward current, but the IR LED's used in the Williams pinballs have a max of 100mA forward current, so 270ohm (50mA) should make them last that bit longer, while having their viewing angle close to max for best operation.
