Temperature...  Corrosion...  Gremlins...

Figuring out how to measure at least one of

the above will further your venture, my guess.

On 9/9/14, Ravi <echip.india@gmail.com> wrote:
> Hi Guys,
>
> I have a 555 based oscillator, AC couple and the probes are in salt
> water of a given concentration.
>
> The probes are in water for about 1 hour from 8 PM to 9 PM and the
> reading is 6500 Hz. I switch off the unit.
>
> The next day at 9 AM in the morning I see that the value has changed to
> 7000 Hz.
>
> What could be causing the drift?
>
> Cheers
>
> Ravi
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