Hi
I am trying to build an LED clock, that uses four 7 segment displays for hours and minutes, and a ring of LEDs around the clock for seconds.
The LEDs are going to be 20000mcd blue LEDs (these ones
http://www.ebay.co.uk/itm/50x-Ultra...Supplies_ET&hash=item2ebbdbc1e0#ht_500wt_1413)
As on average there will be 30 LEDs on at a time (not counting the 7 segs) does this mean that the AA batteries will only be able to power the device for about a few hours before running out of power, meaning that it will need to be powered by a DC adapter?
Thanks
I am trying to build an LED clock, that uses four 7 segment displays for hours and minutes, and a ring of LEDs around the clock for seconds.
The LEDs are going to be 20000mcd blue LEDs (these ones
http://www.ebay.co.uk/itm/50x-Ultra...Supplies_ET&hash=item2ebbdbc1e0#ht_500wt_1413)
As on average there will be 30 LEDs on at a time (not counting the 7 segs) does this mean that the AA batteries will only be able to power the device for about a few hours before running out of power, meaning that it will need to be powered by a DC adapter?
Thanks