Designing a digital clock using discrete logic components

24 HOUR DIGITAL CLOCK

Hi guys,

Do you have any idea about designing a digital clock using DISCRETE LOGIC COMPONENTS and using a seven-segment display? please help...

Re: 24 HOUR DIGITAL CLOCK

That's from the good old days when I've used to play with these goodies.
An old fashioned style until microcontrollers bumps into our lifes.

https://www.howstuffworks.com/digital-clock.htm

Scroll all 7 pages by clicking on NEXT at the bottom of each page.

Re: 24 HOUR DIGITAL CLOCK

This is not very difficult. Here are the basic formulas

You need to start out with a crystal reference that you can divide down to 1pps.

Then you need a ÷60 counter for seconds, another ÷60 for minutes followed by an optional ÷12 or ÷24 depending if you want a 12H or 24 hour display.

You should end up with 1ppm after the 1st ÷60 and 1pph after the last ÷60 block.

Then you will need some decoding drivers (CD4511B) for the 7 segments, a way to set the time by pre-loading the counters etc.

The ÷60 counters you will need to split into a ÷10 (for seconds) and ÷6 (for 10's of seconds) and the same for minutes.

You can buy watch crystals ≈32768kHz that you can use with standard CMOS divider chips that will divide easily down to 1pps. The rest is just hunting through a databook to find the chips and displays you want to use.