Some of the more frequently asked (FAQ) display-related questions we receive from first-time users of digital panel meters go something like: “exactly what is a half-digit, anyway?” or, “what’s the ...

While many products can be improved by the incorporation of a digital panel meter, the price of the device often precludes its inclusion. The circuit shown offers a low-cost solution (see the figure).

The input-voltage range for a typical voltmeter IC is usually ±200mV, with precision of 3½ or 4½ digits. A sigma-delta panel-meter IC from Maxim (MAX1499) is no exception, but you can easily double ...