I recommend, that you first build the outer shell and then use the front-plate and the watch-face as guides when building the inner frame, so you get a little lip where these two components can be mounted later in the process. This is, where the foam separators will be placed later. 1, there should be a 250×250 blank space in the center of the case. Glue the wood pieces together like this: Figure 1: The caseĪs you can see in Fig. The inner one acts as a spacer and mounting place for the LED-boards. The complete case is made out of two squares and the inner one should fit perfectly into the outer square. I included a PSD-file so you only have to change the text and the firmware, so that the correct matrix cells are used. You might need to make your own, if you want it in a different language. Now it wraps correctly around 12pm/1am and I also added a night-mode where a different color and intensity can be displayed between a pre-defined period (10pm to 6am). Includes test scripts for testing LED functionality and the firmware itself. If you want to add extra features, you’ll have to change the firmware and build according to your needs. This build is only the bare minimum, it can only display a time that has to be set manually and can’t be changed during operation.
Sand down the surfaces before applying the glue for a better result. I just used some generic all-purpose glue, worked fine You’ll also need some kind of microcontroller, to control the LED strip, I used an Arduino Nano in my clock. I’ve compiled a list with similar LED-strip controllers. You can use any LED-strip you want, as long as the LEDs can be addressed separately or you build your own controller, that switches on the separate segments. LED strip with WS2812B or similar integrated controllerģ30 ohm resistor (or something close to it, just for short-circuit protection) Will be used as a spacer and to make up a grid for the words on the clock, so the light doesn’t bleed through to other letters that are not meant to be illuminated. Yes, a heavily filtered sine wave may work as a word clock, but will introduce a lot of jitter in the process.For the case you’ll need the following items. You should be able to get most of these components in your local hardware store: Name Digitrax, have you actually used this device as a word clock propagator? The reason I am skeptical is because square waves have a lot of harmonics and you need bandwidth much higher than the fundamental frequency in order to keep them square. I'll look up the schematics for you some time today.Įdit: Ok, I just read Digitrax' post. That's why you have to use a VIDEO amp or other high bandwidth amplifier. It is designed for AUDIO signals, and word clock is not audio. Of course this spec doesn't necessarily mean that the device rolls off abruptly above 100kHz, but it might. How are you going to pass 192kHz word clock with this? This device will also probably filter your nice square wave 44.1kHz clock into a weird oblong sine wave. From the data sheet:įrequency Response: 10 Hz to 100 kHz (+/‑ 0.05 dB) Ummm, no, that's not what you're talking about. Also, do you happen to know what the output voltage it churns out is? What specific chip did you use? Maybe I could locate one NOS. It seems that video BNC repeaters are mostly regulated at 1 volt - because this is what has been established as standard in that medium.Īs everyone knows, no universal voltage standard exists for Digital Audio BNC Word Clock. Actually, I was going to ask about jury-rigging a video BNC amplifier for such a purpose. If you aren't really into DIY you'll be better off just buying one of these off the shelf somewhere.Wow - thanks for that info. If you aren't really into DIY you'll be better off just buying one of these off the shelf somewhere.ĭIY is rarely cheaper than buying off the shelf when you calculate in the time value of money and other factors. Unfortunately I can't locate the build pics but it's just a PSU and the heat sinked vid amp chip on a perf board.ĭIY is rarely cheaper than buying off the shelf when you calculate in the time value of money and other factors. I used a terrific (but now unfortunately obsolete) video amplifier chip because it had waaaaaay more bandwidth than needed for this application.
Of course in stating this I am assuming that your power supply has enough current to satisfy demand and all the other obvious technicalities are well cared for. If the amp has enough bandwidth and your connections are terminated properly jitter won't be a problem. This is a very simple device to build, because it is merely a buffer/amplifier.
DIY WORD CLOCK GENERATOR
I made my own word clock distributor a few years ago, when I needed to take the single output of my WC generator and distribute it to about 8 locations throughout the studio. It's not going to take luck, just a little skill.
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