Questions tagged [electrode]

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How to properly connect metallic conductors to graphite electrodes?

I want to prepare graphite electrodes for electrolytic experiments. I am therefore looking for good ideas on how to get very intimate, long term stable and low resistance connection between the ...
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Which electrode configuration should have the highest electric field produced?

I'm currently simulating the the electric field produced by different types of electrodes. The electric field is observed on the insulator that is sandwiched between 2 electrodes, one being 10 kV ...
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Can someone please explain the concept of an electrode being left "floating"?

I am looking at a stimulation system where one contact on an electrode is modeled as a Dirichlet boundary condition (the contact that is active), while the other contacts on the electrode that are ...
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What is most effecient cathode material for fuel cells?

I am a beginner working with fuel cells. In my lab two main cathodes (electrodes) are used : 1- Silver Oxide Ag2O 2- Platinum on Carbon Powder (Air cathode) I would like to upgrade to a better cathode....
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Why are the cylindrical and spherical electrode potential equations different from each other?

There isn't any information about the calculus performed to find these equations but the book says: One dimensional Laplace equation for the cylindrical coordinates depending on the variable "r&...
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How To Connect Electrodes to Transimpedance Amplifier? [duplicate]

I wrote a post earlier last week asking the same question, but I have better information now. I have a microfluidic cell with silver electrodes with 1mm diameter and about an inch long. I need to ...
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1 answer
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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 ...
-1 votes
1 answer
49 views

Is one RLD electrode enough for multichannel ECG acquisition system?

I am trying to design the multichannel ECG measuring device. My device has to acquire 3 signals at the same time. I have to use 6 electrodes to be able to measure those signals. My problem is each ...
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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 = ...
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3 answers
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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 ...
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1 answer
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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 ...
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2 answers
313 views

Are electrode based, water level monitoring systems safe?

I want to install a pump control with water level monitoring system. I've seen all kind of sensors, ultrasonic, infrared, mechanical (Based in pressure switch's / float valves), etc. One of the most ...
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EC probe for hydroponics; physical design considerations

I want to build a simple EC-meter with two electrodes for a hydroponics project. A naive solution would just have the (copper plate) electrodes hanging into the water, but then the active electrode ...
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3-Electrode sensor potentiostatic circuitry

I'm designing a circuit to read out the C2H4-CA10 sensor. Following the typical applications document, I designed the following: To verify the schematic, I created a new TINA simulation: When ...
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1 answer
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sudden current dropping identifying circuit [closed]

Here is my scenario: I have a pair of electrodes in my device and it is submerged in seawater, so there is a current. Once I take it out the current drops and I want to implement a circuit to identify ...
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1 answer
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can you have a system with multiple anodes connected to one cathode (e.g.Battery, generator, biocell, solar cell)?

simulate this circuit – Schematic created using CircuitLab Usually, the anode transfers electrons to the cathode. However, let's say the anode is not releasing enough electrons to create enough ...
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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 ...
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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 ...
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What electrode material can I use for electrical discharge machining? [closed]

Can I use an electrode made of melted soldering wire in electrical discharge machining (EDM) instead of copper or graphite? I think it is very easy for me to make electrode by using melted soldering ...
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1 answer
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FET electrode convention?

Are there any conventions that allow one to tell which electrode is source and which one is drain?
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Does the bias amplifier of the RLD amplifier need to be connected to reference electrode of the measurement sensor?

I am using the MyoWare AT-04-001 muscle sensor and FSR400 force sensing resistor sensors with the ADS1299 amplifier and ADC and I need to improve the CMRR. The datasheet mentions that an RC filter ...
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3 answers
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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 ...
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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 ...
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Lithium Standard Electrode Potential is (-)3 Volt. They why Lithium based batteries have a nominal voltage of 3.8 V? [closed]

The title sums it up, why there is this difference?
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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 ...
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2 answers
730 views

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?
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Voltage and amperage requirements for resistance heating of glass

I am planning to introduce electric heating/boosting in my glass melting furnace. The present temperature of the glass is around 1200 deg C and I need to raise it up to 1300 deg C. I am trying to get ...
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2 answers
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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 ...
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What is the function of the dippers in a slip ring liquid starter?

The liquid starter is one that uses a washing soda solution and water in a tank. From what I've read, the dippers are attached to a shaft controlled by a small motor to lower the dippers into the ...
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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 ...
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Ion-selective electrode: high input impedance to measure the voltage

I read that an ion-selective electrode has an high impedance (\$100 \, M\Omega\$) and that it's necessary a high input impedance to measure the electrode voltage. I'd like to understand the above ...
4 votes
2 answers
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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 ...
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Isolation of circuitry from heat source

I'm building an electrolysis unit which will comprise a refractory crucible, containing the electrolyte and the electrodes. The heat will be generated from a furnace to aid the desired reaction. A ...
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1 answer
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Strange trend for ECG gold electrodes impedance at DC

I’m trying to characterize two electrodes for ECG which are made as a classic PCB with a rounded shape and with the copper covered by a thin layer of gold (ENIG process). My first attempt was to put ...
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1 answer
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Connectors on pH electrodes

I would like to know why pH electrodes are always with BNC type connectors (or DIN, S7, etc.), but never with "simple" wires. Can we put a BNC adapter to 2 wires and read the tensions with a ...
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Memories' structure

One of the most recent memory architectures is the 3D-Xpoint which has a structure of the type: So, you see that as usual in a memory device we have wordlines and bitlines. Now suposse I want to ...
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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 ...
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What is the relationship between the current produced fuel cell, the electrodes and the voltage of a fuel cell?

I read somewhere that the bigger the surface area for the redox reductions to take place, and ultimately, the more redox reactions that take place, the more electrons that flow through an external ...
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Understanding what Electrode Impedance values mean on Spec sheet

I want to understand what the electrode impedance values given on spec sheet mean. Just looking to gain a general understanding and what voltages/ currents I can or cannot use. The electrodes are used ...
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Measurement of station grounding resistance and test electrodes

This is a pure electrical engineering question. I have seen a request for embedding test electrodes and connect them by "disconnectable" joints to a few earthing bars inside a station building, in ...
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1 vote
1 answer
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Do certain types of electrodes work better than others in an area with hair?

In selecting components for an EEG development kit, I'm wondering if certain types of electrodes capture signals better in the presence of (a small amount of) head hair? For instance options include: ...
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