Three techniques for mounting LEDS on top of buttons.
1
sew buttons with a solderable conductive thread and solder LEDs afterwards to the thread.
2
prepare button with copper tape and solder LED first and then sew to make contact to the copper tape pads.
3
same as 2 but mount LED underneath button facing upwards!
1
>> https://www.flickr.com/photos/plusea/albums/72157711121311008
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