Apparatus for displaying a band representation of a signal

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy

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Details

324122, 340378R, G01R 3100

Patent

active

040657167

ABSTRACT:
Apparatus for displaying a band representation, e.g. a bar graph or column graph, of a signal comprises a series connected array of light-emission devices such as LED.s and a preferably constant current source connected to one end of the series. Transistorised control means is arranged to bypass the constant current around selected ones of the devices in dependence upon the magnitude of an input signal to be displayed so that the devices remaining lit form a band representation of the signal. A center-zero display is provided by applying an offset voltage to the input signal.

REFERENCES:
patent: 3796951 (1974-03-01), Joseph
patent: 3969672 (1976-07-01), Wallander
patent: 4017796 (1977-04-01), Tobias

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