Solid state indicating apparatus

Details Solid state indicating apparatus Solid state indicating apparatus

1978-05-04

1980-04-22

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340782, G06K 1518

Patent

active

041997581

ABSTRACT:
An apparatus for indicating a quantity of electrical information in decimal notation. An input signal having a voltage level proportional to the quantity to be indicated is compared with a plurality of decimally related reference voltage levels to generate a separate decade enable signal for each reference voltage level which is equal to or less than the input signal voltage level. The input signal and the decade enable signals are utilized to generate a units signal having a voltage level proportional to the difference between the input signal voltage level and the voltage level of the largest reference voltage for which a decade enable signal has been generated. The units signal voltage level is compared with the reference voltage levels to generate a separate units enable signal for each of the reference voltage levels which are equal to or less than the units signal voltage level. The decade and units enable signals drive a display which typically includes a plurality of light emitting diodes for indicating the quantity of the electrical information. This display can have the decades indicating LEDs positioned in a semi-circle and the units indicating LEDs positioned in a straight line for improved readability.

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Popular Electronics; Mar. 1976, "An LED Readout Audio Power Meter;" Tim Henry; 4 pp.
Electronics; Mar. 17, 1977, "Analog Meter Has LED Display;" 2 pp.

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