A new take on the classic continuity tester in several ways. This tests with just 100mV across the probes, so it ignores semiconductor junctions and its low input impedance makes it immune to even ...

The 555 timer IC, introduced in the early 1970s, remains one of the most iconic and widely used analog chips in electronics. Let's explore its enduring appeal through a few simple, fully tested 555 ...

This simple but clever continuity tester sports two LEDs: RED LED = circuit resistance is < approx 10K, GREEN LED = circuit resistance <10Ω. It consumes approx 8mA from a 9V battery. When not ...

A multimeter is a helpful tool for advanced electrical projects. But multimeter symbols and their meanings can be cryptic to ...

A. F. BUBNS, in an article on testing of the crossbar system of telephony (Bell Lab. Rec., 20, No. 9 ; May, 1942), points out that in dialling systems a talking connexion is established through a ...

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 ...