Detection of malfunctioning bulbs in decorative light strings

Details Detection of malfunctioning bulbs in decorative light strings Detection of malfunctioning bulbs in decorative light strings

2007-10-02

2007-10-02

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Electric lamp or discharge device

Electric lamp

C324S530000, C315S18500S

Reexamination Certificate

active

11315718

ABSTRACT:
A system for locating a malfunctioning bulb in a decorative light string uses an antenna that produces an output signal corresponding to the strength of the electric field produced by a portion of the light string near the antenna. An amplifier is coupled to the antenna to receive the antenna output signal and produce an amplified output signal representing the strength of the electric field. The amplifier includes a negative feedback circuit to improve the stability of the amplifier. A detector receives the amplifier output signal and activates an alarm device when the amplifier output signal is above or below a predetermined threshold representing a known operational condition of the light string.

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