Questions tagged [electrode]
44 questions
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What is meant by the term "galvanic contact" in this sentence?
Simply speaking, a switch or circuit breaker are two metallic contacts (electrodes) that are in GALVANIC CONTACT with each other when closed and separated by a certain distance when open.
I don’t really get what galvanic means in this contest. I…
Tommaso Bendinelli
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5
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Does anyone have advice on homemade EKG/ECG leads?
I'm not sure this is where it should be posted, so apologies in advance, but I'm working with an Arduino and Sparkfun's heart rate monitor AD8232 (https://www.sparkfun.com/products/12650) to gather ECG data for heartrate. I want to try to collect…
Asinine
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3
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How to solder stainless steel electrode to PCB pad?
My goal is to solder stainless steel electrodes to a PCB in order to make a device that can measure differential voltage measurements from a surface.
How do I attach stainless steel to a PCB to create a design like the one in this picture? Which…
dinoswords
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How To Connect Silver Wire Electrodes to Transimpendance Amplifier
As the title suggests, I need to connect silver electrode wires that are about 1 inch long and 1mm diameter (sticking rigidly out of a microfluidic cell) to a transimpedance amplifier. The problem is that the current coming from the electrodes will…
Gerald Wilson
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How to derive electrochemical two-electrode test strip op-amp voltage output?
I've been trying to understand the following electrochemical test strip in a simplified self-biased configuration diagram:
It appears to be an inverting op amp filter circuit but then gain = - Rs/0 = infinity!!
Given it appears to be a unity gain…
SeanJ
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Activating a circuit with a change in resistance
I am trying to solve a work related issue. Long story short, I have a circuit that monitors the resistance between two electrodes. When an object passes by these electrodes, the resistance reduces drastically, the circuit then measures this and…
Diesel
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Why an does an offset on the reference electrode create an offset on the measure electrode of a pH probe?
I am making an analog front end for a pH probe. I encountered a design where creating an offset on the reference electrode creates an offset on the measure electrode.
How does that work? Does the charge go through water?
Based on TI application…
Damezumari
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Why Protons travel through the membrance but electrons travel through the wire?
In the case of having two electrodes (anode and cathode). I will always hear that positive ions will jump from one electrode to the other causing the electricity to flow the wire. How come only protons only jump between electrodes and electrons too.…
Anwar Elhadad
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How to control the potential in multiple-electrodes (3 or more) in electrochemical cells?
Usually, in most cell designs, the concept of two-electrode design is the baseline. The two electrodes are anode and cathode where the electron transfer happens between them. However, I have been reading about 3 electrodes and 4 electrodes designs…
Anwar Elhadad
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1
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3 answers
Noise in an unconnected biopotential electrode lead wire
My question stems from a particular statement on page 256 of the textbook Medical Instrumentation - Application and Design, Fourth Edition (by J. Webster):
Relatively high potentials can often be induced in then open wire as a result of electric…
apollo901
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How many / which electrodes should I use as input for an RLD (right leg drive)?
When reading through the datasheet of the ADS1298 (an analog Front-End for Biopotential Measurements) I noticed the schematic on page 42 (see below):
It is possible to select or deselect the positive and negative input of each channel with…
jusaca
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Consistently assigning electrode nodes in random resistor networks
In the context of random resistor networks, the general question of interest is often "what is the effective resistance between two arbitrarily chosen nodes?"
But more specifically about the nodes we choose to assign as electrodes, along which we…
user929304
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Which electrode is anode and which cathode in a plasma reactor with high-voltage DC power supply?
Which electrode is anode and which cathode in a set-up like this (plasma reactor)? Or, what is high-voltage sharp electrode - anode or cathode?
Anne
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Are electrodes mostly homogeneous or are there variations by usage, such as EEG vs EKG/ECG?
Are electrodes mostly homogeneous or are there variations by usage? My main usage is EEG. I have some interests in other areas and see similar electrodes sold for less money when marketed for different purposes.
I imagine there are differences in…
Hack-R
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Where exactly in the environment does the 60Hz power line noise be picked up from?
I am measuring EMG signals using ADS1299, and I have problems removing/eliminating the 60Hz noise in my measurements. I measured the EMG signal in differential mode, and I also incorporated a driven right-leg circuit to eliminate the 60Hz noise, but…
Natalie
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