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Thread: ELECTRONICS QUESTION: Light sensor makes RR clock silent at night

  1. #1
    Join Date
    Nov 2006
    Denver, Colorado, USA

    Default ELECTRONICS QUESTION: Light sensor makes RR clock silent at night

    At a garage sale a railroad-themed quartz clock was given to me.

    Every daylight hour it sounds distorted train sounds: choo-choo, bell, etc. (Now I know why they got rid of it!)

    Also, a mee-mool light (o)T(o) on the face flashes.

    I removed the speaker. Mee-mool light still flashes but not after dark. I want it to flash on every hour.

    If I short the light detector, will that represent daylight and the (o)T(o) flashes?

    Or should that detector lead be opened?

    Thank you.
    Ostentatiously humble.
    My patients' arrhythmias straighten themselves out!!
    Innocent by reason of sanity.

  2. #2
    Join Date
    May 2002
    Cypress (Houston), Texas, USA


    It's hard to tell as they can be made to work either way. try this: attach some test wire across the leads of the sensor and see it that works. If it doesn't, remove the test wire and clip/cut one of the sensor leads. One almost has to work. Let us know.
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