"Don Kelly" wrote in message
news:P9rQe.32966$Hk.5738@pd7tw1no...
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"Don Kelly" wrote in message
news:t9vPe.306958$5V4.277776@pd7tw3no...
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Hi all,

I'm trying to create a little experiment where I can take well water
that's heavy in minerals to bridge two wires. This works with AC,
however, I was hoping to use a DC source to make it portable. My
original test was to modify a flash light at the back end and put the
back end with small points on that outside that would bridge once
submersed in the water. If I take a piece of wire between the two
point the light comes on, however, putting it in the heavily mineraled
water does not.

Thanks,
Ken


probably too much resistance, at the low voltage of a flashlight, to
allow enough current to flow to actually make the bulb glow. Try it with
a LED flashlight or use a transistor power stage in between.

--

Don Kelly @shawcross.ca
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----------------------------



Thanks. You wouldn't happen to know of some sites that show examples of
a transistor power stage?

Thanks,
Ken


I am not familiar with any sites but there are lots of books at all kinds
of levels which can give you information. There are also many lurking on
this site who could give you better advice with regard to this than I can.

--

Don Kelly @shawcross.ca
remove the X to answer
----------------------------



You might want to read the thread in sci.electronics.basic "
Designing a low-voltage Moisture Sensor Grid or Pad?"