Hi Audioguru, Ante ! Thanks for your notes. My project was updated before I have read your advice, so I couldn't mention nessesary of regulator heatsink and the contest have already finished. :( I think it is not frequent occurrance using of digitalis camera with PSU and battery charging simultaneously, but it can occur. Therfore I applied pot and ammeter because I charge not only NiMH batteries but older NiCd bat., too with lower charging current.