Posted on Nov 15, 2012

The greatest sensitivity is achieved if R1 is approximately equal to the probe resistance. The circuit can be zeroed with R2, while the full-scale voltage is controlled by R5. The correlation between pH and output voltage might not be linear, which would necessitate a shaping circuit.

Click here to download the full size of the above Circuit.

A calibration scheme, using solutions of known pH, might prove adequate and more reliable over a period of time because of probe variance.

Leave Comment

characters left:

New Circuits



Popular Circuits

Guarded input picoammeter circuit
Four-decade variable oscillator
Micropower Voltage Regulator Schematic Diagram
5V Power Supply Circuit Using Overvoltage Protection
PCM2706 High Fidelity USB Soundcard / USB Headphones
Solar panel
LED pulse width modulator
marx generator
metal detector using cs209a
DTMF Decoder Relay Driver
Compact DJ Station
By the driving capacitive loads MAX4223 ~ MAX4228 circuit diagram
There are preamplifier with four inputs