Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Gaseous discharge
Patent
1975-01-27
1977-04-12
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Gaseous discharge
324 96, 340324R, G01R 1900, G01R 1916
Patent
active
040177963
ABSTRACT:
Analogue display apparatus comprising a chain of light emitting diodes (LED's) connected in series with a constant current source, there being respective transistor switches connected between one side of each LED and a reference voltage source unique to that LED. If a common analogue voltage which is applied to all the transistors exceeds a particular reference voltage, the associated transistor will turn on and will divert current away from the corresponding LED. The number of LED's that are illuminated is thereby indicative of the magnitude of the analogue voltage. Optionally, the LED's control photo-transistors which operate feedback or alarm systems.
REFERENCES:
patent: 2486890 (1949-11-01), Stanmyre
patent: 3796951 (1974-03-01), Joseph
Karlsen Ernest F.
Rolinec Rudolph V.
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