Author Archives: nivagswerdna

About nivagswerdna

Professional Geek

NuTone LD49N Door Chime – Part 1 – A first look

I am very easily side-tracked and for some time I have been interested in adding chimes to my various radio controlled clocks.  Westminster chimes  or variants thereof are often found in vintage mantel clocks and door chimes and also find … Continue reading

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Solar Eclipse August 21st 2017 – Calculations 1 – Greatest Eclipse

If you haven’t been living in a cave then you should know that in August this year, 2017, something awesome is planned for North America and if you have been living in a cave then you will be very surprised … Continue reading

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PIC Delay routines done wrong

During my recent reverse engineering of a PIC12F675 learning board on EBAY I came across the following piece of code… L7: MOVWF 0x20 CLRF 0x22 L6: CLRF 0x21 L5: MOVF 0x20,W SUBWF 0x21,W BTFSC STATUS,C GOTO L4 INCF 0x21,F GOTO … Continue reading

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PIC12F675 Development Board Reversing

So here I am, frittering away a Sunday afternoon, all because I was lured into  Julien Illett’s Youtube Walk down PIC memory lane.  The development board which is useful to play along with these dabblings is an EBAY special which … Continue reading

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Electronic channels on YouTube and getting distracted

I have always had an interest in electronics from a young age, first simply charging capacitors from scrap valve-based TVs and watching the discharge curves and finding something interesting in the mathematics, the same sort of math that can be … Continue reading

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What was happening with MSF60 at 23:59:60?

Something a little bit special happened at the end of 2016.  Most people won’t really care about this sort of thing, but to as a contributor to an OpenSource library for decoding broadcast time standards, this sort of thing slightly plays … Continue reading

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Pragotron Slave Clock – Part 4 – Odd’s and Ends

Given that my clock driver is complete and seems to work quite nicely I think I will move on to other projects however if anyone else is considering building their own variant to drive a vintage clock then I’ll leave … Continue reading

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