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IV-3A VFD Clock

Playing with IV-4A VFD tubes!

carlotto81carlotto81
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These IV-3As are all the same batch, 1981 vintage.

Coming soon: VFD center dots / colon / dot

Using a Teensy 3.6, and ULN2803 darlington drivers. Also has a processor-controlled boost circuit. I want to swap out the filament voltage with PWM regulated AC (instead of DC and a current limiting resistor) at some point... The boost circuit could probably use a opto-isolator. All the segments are individually driven, so no flicker here! They also seem to have some (accidental?) phosphor contamination on the grids.

(updates)
Added RTC (ds1307) and backup battery, for clock functionality.

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