![]() Take the wires to a board with the shift registers (see also ).Add resistors to every single LED on the 7 segment display.Solder the 7 segments to a PCB that sticks out underneath so it fits in PVC pipe (see previous picture).In order to make the clock tick solder the following electronic parts (I don’t have a scheme available, will follow up) Saw/grind slots in the PVC pipe in which you can stick the bottom part of the PCB of the 7-segment LEDs (see the next picture).Make them just wide enough for a large pack of cables (see the last picture) drill holes in the PVC pipe so you can run the wires through them.Glue the box together (except for the bottom).Make sure you drill and router the holes for the buttons and adapter-input on the back panel (see the previous picture).It doesn’t matter if the fit is too tight, you can always sand the holes down. Cut the holes in the top part for the glass domes to fit through.Make sure you cut your wooden parts to the right sizes. ![]() DC Power Supply Female Jack Socket 5.5 x 2.1mm Barrel-Typeįor the casing you’ll need to follow these steps:.Potentiometer (for minutes/hour-settings).28x resistors 200 ohm (depending on initial brightness of LEDs).4x 7-segment cathode displays (large ones (4,5cm/1.8inch)).Glass domes (50mm diameter), you can get these at Groene Vingers in Delft.4x inside PVC (plumbers) pipe, to raise LEDs above the top (40mm diameter).1x inside beam, to raise the domes (250mm * 50mm * 50mm).1x bottom, pinewood (250mm * 90mm * 6mm).2x front and back, pinewood (262mm * 80mm * 6mm).But in case you would like to try it out for yourselves, here is what you need: Materials Hardware I am still in the process of refining the design, certainly when it comes to the Arduino code (which I used as the brain for this clock). I added the drawings to this post, you can find them at the bottom. between the glass domes) are visually the most appealing. In theory the inner workings of such a clock aren’t rocket science and I should be able to design one for myself.Įventually I took my own design inside the woodworking-workshop, glued some pinewood together and hand soldered the PCB into the first version of my very own LED Cathode Clock which I gifted to my good friend.Įven though my modelling skills suck, I’ve used to create a 3D drawing in order to get a feeling for the dimensions of the clock and what distances (e.g. Influenced by Nixie tubes its simplicity and design stuck with me for a while and kept floating in-and-out of my mind for a couple of years. I first saw this clock in 2017 in a small design shop in Rotterdam here in the Netherlands. With “Retro” and “Industrial” being the trend when it comes to interior design for quite some time already I loved the looks of the Karlsson Cathode Clock.
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