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  • #16
    Originally posted by Mike90250 View Post

    The 7 -10 year element life of a CO detector is sad..... Replacements seldom fit the original footprint. I've got a hardwired AC powered system in my house, all 18 (thanks kalifornia) of them interconnected, I'm about to have all the CO's expire and hope I can find models that fit the hardwire connectors !
    [FONT=comic sans ms]You can always get a canary. [/FONT]

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    • #17
      Originally posted by SunEagle View Post

      [FONT=comic sans ms]You can always get a canary. [/FONT]
      18 canaries, 18 cages, 18 kids to feed the canaries ... no, wait, one kid can do all of them.

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      • #18
        Originally posted by Mike90250 View Post

        The 7 -10 year element life of a CO detector is sad..... Replacements seldom fit the original footprint. I've got a hardwired AC powered system in my house, all 18 (thanks kalifornia) of them interconnected, I'm about to have all the CO's expire and hope I can find models that fit the hardwire connectors !
        I think that 7 years is something very conservative just thrown out, they really last much longer. But
        the industry jumped on it as a way to sell a lot more detectors. I measured mine, puts out a short 1
        second beep exactly every 45 seconds. So I figure build a circuit that detects the 1 second pulse,
        waits 44.5 seconds, then triggers a 2 second opening of the beeper circuit. No beep heard, but if
        there is an output, it will start timing for the next 45 seconds. If there is a real alarm, it will not wait
        45 seconds, and will not be blocked.

        Will I be sued for publishing the circuit? May block low battery alarm, except mine gets
        DC from a line source. Bruce Roe

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