Automatic battery powered video light
作者： Peter A. Hochstein
DOI:
关键词: Terminal (electronics) 、 Photodetector 、 Battery (vacuum tube) 、 Electrical engineering 、 Color balance 、 Pulse-width modulation 、 MOSFET 、 Power (physics) 、 Physics 、 Versa
摘要: An automatic battery powered video light (10) is supplied power by a d.c. (16). A (20) connected between first terminal of the (16) and MOSFET switch (46), which to second control circuit (24) controls opening closing (46) supply disconnect from (20). The includes sensor (36) for sensing ambient reflected radiant scene (14) pulse width modulator (40) controlling (46). increases therefore time when senses low levels, vice versa. Also provided dual filament (20') wherein each (52, 54) independently controlled enhance color balance.
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