jasen wrote in
:

On 2006-08-03, Z wrote:
jasen wrote in
:

Oops, the ADC input tolerance is -0.3V, not -0.5. I'll look for
germanium diodes though! -0.2V would work.

The output impedence is somewhere around 500K-1Meg, which is why I'm
using a 10 teraohm input impedenace op-amp. The sensor ground is
simple connected to circuit ground.

could you connect the PH sensor ground to a voltage divider instead ?

Bye.
Jasen


I've considered that, but I don't know enough about batteries to know if
that would damage the sensor or not.