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US 3,944,854 AGranted
Light-emitting diode connected to a coil
AssigneeITT Industries, Inc.
InventorHans Keller
Life of this patent
Estimating the term…
Abstract
This relates to a light emitting diode circuit wherein a coil is connected to a voltage source, the voltage of which is lower than the threshold voltage of the forward diode characteristic. The light emitting diode is connected in series via the coil to the voltage source, and a transistor operating as a switch is connected in parallel to said light emitting diode.
Claims9
A light-emitting diode circuit comprising:
- means for applying a supply voltage having first and second poles;
- a coil having first and second terminals, said first terminal coupled to said first pole;
- a first transistor operated as a switch having a base, emitter and collector, said emitter coupled to said second pole and said collector coupled to said second terminal;
- and
- at least one light-emitting diode coupled in parallel across the collector-emitter path of said first transistor, said diode having a forward threshold voltage higher than said supply voltage.
2 more elements
Dependencies are inferred from the claim text.