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Close up of the small strip of printed circuit board with the LEDs on it.

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Wildman that may be right, it may be possible to have too much light. I vaguely recall that cranking the LEDs up...

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As can be seen the conversion was mainly a mechanical one. Electrically the Chrony circuit has an on-board 5V regulator so either 6 or 8 cells should be fine. Operating...

Rainy day project: improve the F1 maybe? The reliance on natural light for the Chrony and the resulting inconsistency has been quite a problem for me (and the cost of 9V batteries). You could try...