Reading about the power supplies for the clock, I found the MK 1.5 power supply (schematic: https://threeneurons.files.wordpress.com/2011/08/mc34063_mk15cm1.gif) and have already built a clock based on it, but the coil seems to be buzzing pretty noticeably, especially when all the tubes turn OFF -> ON or change numbers at the same time, you can hear the buzzing frequency change at those moments. I suppose that changing the inductor could fix it so I'll give it a try. But, on multiple threads I saw people mentioning MK.II version of the power supply but wasn't able to find the schematic for it. So, does anyone have the schematic for it and would be kind to share it or was it never even made publicly available?
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