Indicator lights
Many years ago I built a box housing switches, indicator LEDs, and a variable speed clocking trigger that I could use to make and test TTL logic circuits for a college class (see last Monday's photo of the breadboard to which this would be connected).
This is a row of indicator lights from that box. The row is approximately 3"/75mm from end-to-end but the width of the photo at the subject (in focus) LED is about half that.
Indicator lights
Many years ago I built a box housing switches, indicator LEDs, and a variable speed clocking trigger that I could use to make and test TTL logic circuits for a college class (see last Monday's photo of the breadboard to which this would be connected).
This is a row of indicator lights from that box. The row is approximately 3"/75mm from end-to-end but the width of the photo at the subject (in focus) LED is about half that.