Thread: Chronographs, what's the story

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 time between charges is set by the current run through the LEDs as the chrony circuit itself doesn't draw much.

On the question of brightness I'm currently running 10mA through each LED and I have 20 in a row to get that light-bar effect, all in parallel, so 200mA through the LEDs - the front & back strips are then run in series. 8-10 hour run time. The LEDs came from Jaycar Electronics as some sort of pre-made strip lighting that can be cut to length off a reel. I had 2-3 metres of it and that gave me 60-80 LEDs. The tricky bit is that these then need to be removed and rearranged side-by-side on your own bit of circuit board with their own series resistor each to make a pair of 55mm wide solid strips. They are Surface mount style so this will test your soldering skills. Once done it does work really well and doesn't miss a beat. Less forgiving than the plastic screen if it took a hit though.