Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1977-02-25
1977-12-27
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
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
Alfred Herbert Limited
Krawczewicz Stanley T.
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