I took apart a flickering LED candle. The circuit oscillates at 1 Hz verified with multimeter and oscilloscope.

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Can anyone explain how the circuit works? It looks like the emitter is grounded in a PNP.

  • 4
    \$\begingroup\$ What are the odds of a schematic error? \$\endgroup\$ Commented Jan 3, 2021 at 13:55
  • \$\begingroup\$ Your schematic wrongly shows a white LED burning out because it is directly connected to a 6V battery. The datasheet for the BSS65 transistor shows a maximum allowed reverse biased emitter-base is only 4V so with the 6V it has avalanche breakdown and conducts, maybe making intermittent noises. \$\endgroup\$
    – Audioguru
    Commented Jan 14, 2023 at 18:34

1 Answer 1


Possibly works similar to one of the "negative resistance" flashing circuits:



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