Originally posted by sucahyo
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use 12 V batt., it wont work with lower volts devices, at least
it wont work unless you change values of components, but i am
content with 12 V as source and these component values, and
if you want you could add 5 more leds running your device with just
18 mAmps instead of cutting off number of leds, but everyone should
make his/her own best choice regarding number of leds....
Originally posted by sucahyo
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And even if it is so, could you explain it a little bit in context of relay story
that we discuss off ?
. How many current a LED need individually without that kind of circuit? maybe with just a 2.2K resistor?


, we are going to see a lot of similar surprises in future, which means we can not learn how to swim if we do not jump in to the water, and we can not be dry and swim in the water in the same time, can we ? 
.
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