https://electronicscheme.net/dark-and-light-activated-relay/?utm_source=rss&utm_medium=rss&utm_campaign=dark-and-light-activated-relay Schematic Diagram & PCB Design Sun, 28 Feb 2016 16:58:52 +0000 hourly 1 https://electronicscheme.net/dark-and-light-activated-relay/#comment-213939 Sun, 28 Feb 2016 16:58:52 +0000 http://electronicscheme.net/?p=371#comment-213939 What if I put a 74123 (dual monostable multivibrator) in between transistor and relay. Is it possible to restrict the relay only for the falling edge, or using a second relay and catching both rising and falling edges?
What I try to realise, is relay activation by start and end of darkness (not just during darkness).

]]> https://electronicscheme.net/dark-and-light-activated-relay/#comment-122097 Fri, 04 Nov 2011 13:02:12 +0000 http://electronicscheme.net/?p=371#comment-122097 Made this one and it works. Modified with a cellfone charger of 5v and works. For 12v car battery use change limiting resistor to 1watt.

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