Voltmeter Clock Looks Great On Display

However, rather than hack around with the internal circuitry, I decide to see if I could keep the meter intact and use the existing voltmeter functionality to display time. The basic idea is to send the meter a voltage corresponding to the time, so e.g. 12:45 becomes 12.45V. The meter has a 20V range which displays a fixed 2 decimal places which suits my purpose just fine. Unfortunately there is a hard limit of 20V on this range so a full 24 hour clock is not possible, but a 12 hour clock is.

Clocks have been my hobby since years. I have built a number of electronic or electromechanical clocks myself, it is an excellent psycho-hygienic activity. Obviously the more obscure, the better. Digital clock with relay logic, one line word-clock, voltmeter clocks, wristwatch with numitron display and discrete logic (no microcontroller),VFD bar dot indicator and discrete transistor logic, nixie tube logic just to name a few. As much as I can, I always try to use the technology from the era the displays/clocks were made. Using a microcontroller would be just boring and pretty much an insult to those beautiful pieces.

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Over the years I have accumulated a decent collection of various models of Elektroas/Pragotron electromechanical slave clocks and flip display clocks. I was always dreaming to obtain one of the master clocks to drive my collection. This feeling intensified after visiting the Clockworks in London. At the end of 2021, after a series of very fortunate events, I have managed to obtain the holy grail: Elektroas HH3 (Hlavn Hodiny 3). The master clock was produced since 1950's till (??), see the leaflet at pragotron.sk. The datasheet says "Accurate master clock HH3 for scientific institutes, observatories, power plants, laboratories, radio, television etc.". Unfortunately, not a lot of information about this model is available on the interwebs.

The clock needed a lot of tender loving care. The cabinet showed traces of bad water infiltration. The top cover plywood was completely disintegrated. Guessing from the marks left, it looks someone had installed a flower pot on top of the clock. Over the years, spills from watering left their marks. Fortunately the clock mechanism was not damaged, though it had suffered of some incorrect care. A lot of grease was stuck all over the gears. The clock needed to be completely disassembled, thoroughly cleaned, oiled and adjusted. This job was taken care of by a small family horlogery in Partiznske. Father Jozef Kollr and the son Michal Kollr M-watch service did an incredible job. Thanks for all the fun I can have now! be457b7860