https://stream.echo6.co/videos/watch/39d3a902-bcc6-48fe-a5de-8ef0e838f705 This was just a quick fun project that I used to test whether a UV nail varnish hardener could be used to expose UV sensitive PCB laminate. (It worked fine.) It's basically a small PCB designed to push into a standard USB socket with two pads where the +5V and 0V connections are. It uses the 5V supply to power three parallel LEDs via a 100 ohm resistor. (Just 20mA shared between them.) The only issue I had with the design was that the standard 1.6mm thick laminate is just a bit too thin and needed some layers of tape applied and then carefully trimmed to make it a snug fit against the electrical connections. Wed, 15 Apr 2026 09:22:50 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/39d3a902-bcc6-48fe-a5de-8ef0e838f705 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.