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voltage booster | Details | Hackaday.io
source link: https://hackaday.io/project/176497-vfd-watch/log/187390-voltage-booster
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For Grids and Segments you need to boost voltage up to 30v.
I've used MT3608 dc-dc boost converter IC for this purpose and boost 5v to 28v.
This is the Schematic of the boost circuit you can find in the datasheet :
there's several arrangement of R1 and R2 to achieve desired output voltage. this is my arrangement for maximum output voltage:
finally i choose 100K and 2.2K...
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