On the website http://www.ebastlirna.cz/modules.php?name=Forums&file=viewtopic&t=45799, from which you took this photo, at the end of the discussion the questioner admits that he complied with the advice, mounted 2x4.7uF / 400V and a heat gun it works. Probably 8u / 400V (4.7 + 3.3 can be used).