12.07.2015 Views

DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC ...

DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC ...

DESIGN AND DEVELOPMENT OF MEDICAL ELECTRONIC ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

CURRENTTOOSCILLOSCOPECHANNEL 2"Y" INPUT FORVOLTAMMETRYJ2SIGNAL GENERATORAPPLIED VOLTAGETOOSCILLOSCOPECHANNEL 1"X" INPUT FORVOLTAMMETRY+15VR310k32+-+15V411-15VIC2ATL084112BWVIN+15V53VOUTIC1BUF6344+ C1R11010uF+15V12BWVIN5VOUTIC3BUF6344+ C410uFV- V+V- V+C60.01uFJ156+-411IC2BTL0847R210kC30.01uFC90.01uF-15VC20.1uF+ C8C70.01uF10C10 10uF0.1uF -9+411IC2CTL0848+15VC50.1uFR410R5C113-15VC130.01uF10050pF-15VC140.01uF-15VC150.1uF+ C1210uFSATURATEDCALOMELREFERENCEELECTRODELARGEPLATINUMCOUNTERELECTRODER6100k"WORKING" ELECTRODE:IRIDIUM ELECTRODE TOBE COATED WITH IROX0.3M Na2HPO4ELECTROLYTEPYREX CONTAINERFigure 7.16 Iridium oxide coatings can be grown on iridium-metal electrodes by electrochemical activation in a Na 2 HPO 4 solution.Electrochemical activation should be done using a standard three-electrode cyclic voltammetry setup. The potentiostat circuit (IC1, IC2A,and IC2B) tries to maintain the voltage applied between the working and reference electrodes with negligible current passing through thereference electrode. IC2C, IC3, R4, and R6 act as a current-to-voltage converter such that the counter electrode acts as a source or sink ofelectrons to balance the redox reaction occurring at the working electrode.330

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!