Electrical circuit means for use in analogue display and/or cont

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Gaseous discharge

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324 96, 340324R, G01R 1900, G01R 1916

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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

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