Could be that it needs a minimum of 100ms@6volt, and only 20ms@18volt.
With that calculator I get ~220mF with an end-of life 9volt battery (7volt), 1volt drop (to 6volt), and 100ms.
That's 220000uF, or 0.22F.
Leo..
Could be that it needs a minimum of 100ms@6volt, and only 20ms@18volt.
With that calculator I get ~220mF with an end-of life 9volt battery (7volt), 1volt drop (to 6volt), and 100ms.
That's 220000uF, or 0.22F.
Leo..