Photoelectric smoke detector — teardown

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Photoelectric Smoke Detector IC with I/O: MC145010P

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Smoke particle sensor box:

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Corroded Piezo speaker:

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3 Responses to Photoelectric smoke detector — teardown

  1. darell tan says:

    Interestingly the optical smoke detection chamber looks similar to what’s inside a optical dust sensor like the Shinyei PPD42NS. Wonder if it might get triggered if you stir up some dust under it.

    • robert says:

      Yes, that sometimes works. For obvious reasons this one was replaced with a new one, which erroneously triggered an alarm a couple of times. It turned out to be accumulated dust inside the test chamber. The error went away after blowing some air into it.

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