C.<p>I just cost myself several very puzzling hours over the course of a few days, because I forgot the first rule of debugging electronic circuits.</p><p>It's the connector.</p><p>It's always the connector.</p><p>I'd been having trouble getting some of my guitar effects modules to work correctly - older ones that I knew worked were giving me issues, and newly-made ones didn't pass any signal back through to the one they were connected to. I spent lots of time tracing through circuits trying to find where the signal was disappearing, and then trying to figure out *why* it was disappearing there. It wasn't until I happened to scope one of the wires in a cable at one end, followed by the other end, and found the signal disappeared somewhere in between...</p><p>It turns out some male-male JST XH cables I made were faulty - but not because of me. I'd bought premade pigtails, and just added another connector to the other end of the wires. Checking these more carefully, I found that 3 of the 6 I had made had one or more wires that weren't connected properly.</p><p>Taking them apart, it became clear why. Whoever set up the crimping machine when making those pigtails didn't do it right. A bunch of the wire crimps had the wire inserted way too far into the contact before it was crimped - so the wings that are supposed to make contact with the stripped portion of the wire were actually just closed on insulation. No contact at all.</p><p>Reminder to future me: check the connectors first!</p><p><a href="https://mindly.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://mindly.social/tags/hobby" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hobby</span></a> <a href="https://mindly.social/tags/oops" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>oops</span></a></p>