mbarazeen
Member
the idea of using high frequency and dividing, is to cut such errors. so i dont beleive the crystal can be the cause. if it differs 4sec its nearly 10% and a crystal never diviate like that.
ok do one thing to check you get right 200Hz at the out put of the 1st 4060, give this signal to your min and hour circuit input. so any of the hour LED should light on after (60x12)/200 = 4.6 sec. so to make it countable you can count 10 times ON of a particular LED and compare the time it takes for it, it has to be 49 sec.
to check the 2nd IC connect LEDs at the out put of the IC (with resistors to limit current) and manually feed it by push botton, then observe how it change it state, you will have to press 12,000 times to get last state and then it will reset. you can observe the LED to change in binary counting when you press..
about the micro switch i will post you later how to wire with RC filter or soem one can post it for you
ok do one thing to check you get right 200Hz at the out put of the 1st 4060, give this signal to your min and hour circuit input. so any of the hour LED should light on after (60x12)/200 = 4.6 sec. so to make it countable you can count 10 times ON of a particular LED and compare the time it takes for it, it has to be 49 sec.
to check the 2nd IC connect LEDs at the out put of the IC (with resistors to limit current) and manually feed it by push botton, then observe how it change it state, you will have to press 12,000 times to get last state and then it will reset. you can observe the LED to change in binary counting when you press..
about the micro switch i will post you later how to wire with RC filter or soem one can post it for you