| 摘要 |
In the oscillating booster circuit of an electronic flash device for a camera arranged to boost the output of a DC low voltage source by a blocking oscillator circuit and to make it into a DC high voltage through a high voltage rectifier diode before a main capacitor of the flash device is charged therewith, a booster circuit operation display arrangement is operated solely by the spike voltage of the booster circuit to stably display the operating state of the booster circuit.
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