From bigclivedotcom.

I love this clock. It’s very accurate and serviceable. The circuitry is purely logic chips with no microcontroller. If you use turned pin sockets for the LED displays it lets you change the colour as desired or just swap in new displays if the old ones fade over time.

The clock requires a power supply capable of 5V at about 150mA.

There’s also scope to drive much bigger displays with the circuitry, as CMOS logic chips can operate up to about 15V, although it might require tweaking of the oscillator components if a higher voltage is used. You’d also need to make sure the electrolytic capacitor was suited to the higher voltage.

The digital displays are standard 0.56" common cathode displays. The strips I used to make them pluggable are classic 40 way turned pin socket strips.

This kit came from AliExpress (not a sponsor) :-
(This is the black PCB version, as I can’t find the green version.)
https://www.aliexpress.com/item/1005006053545226.html

They also do versions with laser cut plastic panels to make a case.

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