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AC Responsive led pilot light circuitry

  • US 3,869,641 A
  • Filed: 10/24/1973
  • Issued: 03/04/1975
  • Est. Priority Date: 06/21/1972
  • Status: Expired due to Term
First Claim
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1. An LED pilot light operable from a source of AC line voltage, comprising a pair of light-emitting diodes, said diodes being connected in parallel with opposite polarity, each of said diodes generating light when properly forward biased, an enclosure having a light transmissive portion, means for supporting both of said diodes in said enclosure such that light emitted by said diodes radiates from said enclosure through said light transmissive portion in a single direction, and a capacitor having one side interconnected with said pair of diodes at one junction common to said diodes, a first circuit input terminal interconnected with the other side of said capacitor, a second circuit input terminal interconnected with the other junction common to said diodes, the capacitor voltage following AC line voltage applied to said input terminals and limiting the voltage drop across said diodes as said diodes alternately conduct on respective half cycles of said AC line voltage.

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