Re: Conductivity sensors


mooseo wrote:

I can't quite figure out what parts of the cirtuits are interacting
with each other.

All should have one common probe, like a ground.

Hi Homer, thanks...
I'm not quite sure what you mean by this... all the circuits are on a
single power supply, so they share a ground. The probes themselves are
connected between pins 3 and 6 on the 555. Are you suggesting that I
ought to link these circuits in some other way?

When you multiplexed the powers, did you isolate the grounds as well.
Did you have filters isolations for the power supply? Did you isolate
the probes? Treat this as a very noise sensiitive circuit.

.

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