Morning Dave,
>> current to just under 1ma, but if you change the value of R1, you should be
able to set the current to what you like (within reason!).
Nice circuit, nice drawing. One question.
Have you checked the brilliance of the LED at that low current? Likely
some of the smaller ones will work fine.
I would like to point out the disadvantages of the constant
current. Using constant current, the LED will not serve as a visual
indicator of current flow which allows the rejection of inferior water.
I realize this is not important to many, but it is to me, because I have
found so much junk distilled water.
Plus I am in the habit of doing it, my eye is trained, but I am not close
minded.
So, the best of both worlds..... build a nice unit with a switch. This
would allow the use of constant current and NON-constant current when needed.
Wayne
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