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FSCV Headstage Amplifier
NOTE: A working electrode driven systems means the waveform is applied to the working electrode, which is then later software subtracted. Such a design is consistent with the general FSCV research community.
This Headstage Amplifier is designed for use with the Pine Research WaveNeuro Fast-Scan Cyclic Voltammetry Potentiostat System. Installation is as simple as "clicking" the adapter onto the headstage cable. This 200 nA/V (5 MΩ), working driven headstage amplifier is wrapped in blue-colored shrink tubing to differentiate it from our other headstage gains. This particular adapter is for general purpose FSCV experiments, where typical microelectrodes (~100 μm long cylinder) are used.
Pine Research currently offers working driven headstage amplifiers. In a working driven system, the reference electrode is grounded. The FSCV potential waveform (ramp) is connected to the non-inverting input of the operational amplifier, while the working electrode is connected to the inverting input. In this arrangement, the voltage at the microelectrode will follow the ramp applied to the inverting input.1
In this two-electrode configuration, current arising from electron-transfer reactions, such as the oxidation of dopamine, passes between reference and working electrodes. The measured current passes through the headstage amplifer, where it is converted to voltage, and sums with the the ramp voltage at the inverting input. Mathematically,
where is the output voltage, is input current, is feedback resistor (gain), and is the CV ramp voltage. By rearrangement, the signal voltage (proportional to the current across the feedback resistor in the headstage) is then
HDCV software, which supports the WaveNeuro FSCV Potentiostat system, performs software subtraction of the ramp according to this relationship, resulting in only the true differential current measurement.1
(1) Takmakov, P.; McKinney, C. J.; Carelli, R. M.; Wightman, R. M. Instrumentation for Fast-Scan Cyclic Voltammetry Combined with Electrophysiology for Behavioral Experiments in Freely Moving Animals. Rev. Sci. Instrum. 2011, 82, 74302.
R.M. Wightman et. al. have reported on this topic in depth If, after reviewing this document, you have any questions about our neuroelectrochemical research products, please do not hesitate to contact us.