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digital clock with an alarm
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Rajan Shah:
I'm building a digital clock as my side project to know how counters and other stuffs work. I've implemented it in pcb for seconds and minutes portion till now. As soon as I give Vcc and ground, the minutes portion starts from 20 instead of 00 and then resets at 40 instead of 60. I've checked the circuit. Everything's okay. I've used 555 timer, 7490 ic and 7447 ic. For the Vcc and ground, I've given parallel connection to all PCBs. Is this problem because of Vcc and ground or is it any other factor?
Chriss:
Hi
Can you please post a schematic about your circuit?

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Rajan Shah:
This is the circuit up to minutes.
Chriss:
Is it every time starting from 20 when you give power to the circuit?

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Rajan Shah:
yes. And sometimes, in second it starts randomly from 98, 99 and so on. I don't understand what's wrong.
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