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Mains powered outdoor delay switch

Discussion in 'General Electronics' started by PCPaul, May 28, 2008.

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  1. PCPaul

    PCPaul Guest

    Since pneumatic or mechanical delay switches with outdoor fitting kits
    are extortionately expensive, I was wondering if anyone had a good
    circuit for making my own...

    Ideally a single button press would start a delay timer that activates a
    light for a few minutes (to light the way from the garage to the house).

    I'm happy enough with digital electronics but my analogue is weak.. it
    seems like there should be a way to use mains only for this, with a triac
    or SCR to switch the load (<1000W) and some sort of rectified feed to a
    CR circuit to do the timing. I'm sure there must be a better way...

    The issue of it being outdoors (basically replacing a dead pneumatic
    weatherproof switch) is also a problem, but making a sealed rainproof box
    with a suitably rated momentary switch shouldn't be too difficult.

    Any ideas?

    (I've seen the motorised timers in an earlier thread but they were 110V
    and in the US - I'm in the UK on 240V 50Hz).
  2. neon


    Oct 21, 2006
    replace the switch with a reed switch or optical isolator. so on a rainy day or foggy day you don't kill yourself.
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