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Science Forum Index » Electronics Forum » Mains powered outdoor delay switch...
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| PCPaul... |
 Posted: Wed May 28, 2008 5:54 pm |
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Guest
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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). |
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