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dave, it’s a fairly simple electronic circuit but it is important to note here that this cannot be done without actually discharging the capacitor a little bit. If you want a small LED blink when the capacitor is charged, it could be done with a small timer and it won’t affect the charged capacitor as much. As you can see the charging circuit of the flash of a camera mentioned in an above post, shows that the LED will be switched on as soon as the voltage divider acquired the required voltage but since there is always a resistance connected across the capacitor, it provides a path for the charges to discharge.
