A battery–capacitor flash (BC flash) is a flash photography system used with flashbulbs. Instead of relying directly on the current pulse ability of a battery to directly fire a flashbulb, a battery was used to charge a capacitor that would then discharge through the flashbulb. BC flash units used either 15V or 22½V batteries.
The advantage was that even with an aging battery, the flashbulb would still get a high current pulse and thus reliably fire, although the recycle time between flashes would increase as the battery aged.
- Electronics for Photographers, by Marshall Lincoln, Copyright 1966 by Chilton Books, pp 43–54.
- Capacitors & Batteries, Boston University Physics Department
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