| 摘要 |
<p>The arrangement is for the measurement of the state of charge of a battery used to operate a Voltage converter and storage capacitor circuit for an electronic flash unit, esp. one built into a camera, gives a reliable automatic indication shortly after the circuit is switched on. The time taken for the storage capacitor (7) to charge up to a defined voltage force is compared with a reference time from a clock circuit (2). An electrical indicator (10) is controlled according to the result of the comparison. The time circuit (2) is triggered when the main switch (1) is turned on. After a reference time it triggers a bistable (5) when the latter voltage has been attained. The bistable, a D-type flip-flop, drives the indicator. It can also control the camera shutter release.</p> |
