Hi, I am currently studying digital circuits and have been wanting to make a digital clock for some time now. I have made a simple 0 - 9999 counter using a pic but I would like to use BCD counters and gates to make a 24 Hour digital clock with 4 7-segment displays eg H H : M M format.
I have a rough idea of how to make it but I'm having trouble with the multiplexing of the displays as I would like this clock to be portable and run on batteries. I was thinking of making this circuit for the 1Hz clock pulse signal as I want it to be fairly accurate: https://en.wikibooks.org/wiki/Practical_Electronics/Plugins/1Hz_Oscillator
or is there a simpler way as I would like to keep the size and cost down of the project.
This is a basic layout of the circuit I will be using:**broken link removed**
also not shown on the picture but 4 x 74ls47 for the displays?
and for the multiplexing I had 2 x 74LS153 in mind. or 1 x any Quad 4 input mutiplexer.
Just need some adicve from people with experience to double check if this solution could work and if I would need more components (maybe use a decoder/dmux ic?)...or maybe even an easier way you might be able to suggest.
By the way this is my first time working with components like these on my own.
Thanks
I have a rough idea of how to make it but I'm having trouble with the multiplexing of the displays as I would like this clock to be portable and run on batteries. I was thinking of making this circuit for the 1Hz clock pulse signal as I want it to be fairly accurate: https://en.wikibooks.org/wiki/Practical_Electronics/Plugins/1Hz_Oscillator
or is there a simpler way as I would like to keep the size and cost down of the project.
This is a basic layout of the circuit I will be using:**broken link removed**
also not shown on the picture but 4 x 74ls47 for the displays?
and for the multiplexing I had 2 x 74LS153 in mind. or 1 x any Quad 4 input mutiplexer.
Just need some adicve from people with experience to double check if this solution could work and if I would need more components (maybe use a decoder/dmux ic?)...or maybe even an easier way you might be able to suggest.
By the way this is my first time working with components like these on my own.
Thanks