A precision voltage reference is useful in the lab for checking your multimeters. This post describes the construction of a poor man’s precision voltage reference. It is great for checking any ...

Digital multimeters are precise and accurate instruments, with some models being very expensive. No matter the cost, one problem pervades every one of these devices: They do a poor job of conveying ...

Electrical problems are both common and difficult to diagnose. Poor earths, broken wires and dodgy batteries can all cause havoc and take hours to trace, even on fairly simple cars. This makes a good ...