frankwas Posted September 24, 2006 Report Share Posted September 24, 2006 Hi All!Thanks to all for your input on my previous project's questions. Now I have a new one, very small actually and I'm sure a lot of you will be able to solve it within minutes.Speaking of minutes, I would like to build a digital 7 segment clock, from a kit or whatever, then have it switch on a relay momentarily (for about 1 - 2 seconds) for every minute it advances in time and then carrry on as usual. Is this easy or diff to build?Thanks.Francois. Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 24, 2006 Report Share Posted September 24, 2006 Hi Francois,Pick a clock circuit that doesn't multiplex the display.An electronic clock doesn't have an output that gives a pulse each minute. You would need to take a signal from each segment of the lowest minutes digit and capacitor-couple them to an OR gate. Then make a 2-seconds monostable which is triggered by the gate.Or you could use a divide-by-60 counter that is clocked by the colon that blinks each second. It would trigger the monostable. Quote Link to comment Share on other sites More sharing options...
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