LOGO2 Bridge & OPAMP

    ENZYME ASSAYS - MEASURED BY CHANGES IN SOLUTION CONDUCTIVITY

 

Simple, Sensitive, Low Cost (ca. £200) &  Reliable

 

                     EASY TO BUILD

 

                PCB available soon

 

[It takes longer than I expected to design and implement an effective PCB - I am just starting the second design cycle which will require another fabrication etc. It will be worth it in the end!!]

 

 

Can be used for: Blood & Urine Clinical Tests, Industrial,

       College & School projects [see APPLICATIONS]

 

Uses two low cost electrochemical cells (Sample & Reference) in an ac bridge for extra differential sensitivity

 

The simple bridge circuit & the apparatus are shown below

Photo 1 whole setup

SERIOUS ERROR!!! The prerviously presented circuit for the Precision Rectifier showed the feedback resistor for the final amplifier connected to the non-inverting (positive sign) input. This is incorrect it should be connected to the inverting input negative sign. A corrected circuit is now shown. Apologies to anyone who has been troubled by this long-standing error. Of course my own circuit has been connected correctly it was a typographical error!

ULTS

GO TO RESULTS    GO TO INTRO BASIC   GO TO INTRO SPECIFIC

 

 

 

 

 

 

 

 

 

 

 

 

 

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