The neon glow lamp tester is a staple in every electronics hobbyist’s lab. Here’s how to build one right in your own home. You may wonder what’s so cool about the “historical” neon glow lamp. For ...

Some kind of continuity beeper has been a standard piece of gear since the dawn of electronics. Sure, you probably have an ohm meter, but sometimes you don’t care about the actual resistance. You just ...

This Design Idea describes a handy continuity tester with two modes of operation: It may sound if it detects continuity between its two probes, or it may sound when it detects no continuity. The ...