For one of my 'fun' project I needed a display for which 7 segment displays are sufficient... but it needs 'a lot of' them in a tight space... and that's where the Bubble Displays come in: Retro, small red LED segments behind a lens to make them readable.
Surfing for supplies I found individuals, bars of 4, 8, and 12... The most affordable - and convenient to use ones - are the PCB carrier bonded ones - see attached photo.
To be continued...
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