This project is 7400 series logic ICs based clock. It keeps time solely based on discrete logic ICs and a stable clock source.Designed by Electronics Corner in United States of America
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Features 12 Hour Time Format Modular 1Hz clock source Hour and Minute Time Set All through hole components What is it? This is a clock based off the 7400 Series logic family of ICs. It keeps time i…Read More…
This is a clock based off the 7400 Series logic family of ICs. It keeps time in a 12 hour format using an external 1 Hz source. The 1 Hz source comes from a 4 pin header, and allows to be changed out in the future.
I wanted a clock for my home office that stood out and thought why not make one that doesn't need a microcontroller or an FPGA? From that thought came this project. Originally I was not planning on making a kit, but as I was designing it and doing the layout, I realized it could be a great kit to learn soldering. The kit uses all through hole components to keep the soldering at a beginner level.
I think it's a pretty simple design. It uses a total of 13 discrete logic ICs from the 7400 Series logic family. Time is kept via a 1 Hz source that plugs into a 4 pin header. This allows for future upgrades to improve the overall time keeping accuracy. It displays the time in a 12 hour format. The hours, minutes, and seconds are displayed. There are two config buttons that allow setting the hours or minutes.
The whole board is powered using 5V that can be provided from the DC barrel jack. I also separated out the voltage that powers the display. Right now, a jumper is provided to allow 5V to go the display. However, if you are up to the challenge, you can add your own dimmer circuit to adjust the brightness of the voltage.
William | May 26, 2021
Whitney | April 20, 2021
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