Questions tagged [electrode]

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27 views

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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1answer
55 views

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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1answer
73 views

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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0answers
44 views

How to calculate the optimal distance between an anode and cathode?

How to calculate the optimal distance between an anode and cathode? If I am making a fuel cell, how can I determine the best distance for best conductivity between the two electrodes (anode & ...
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1answer
112 views

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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38 views

How does this branched electrode circuit work?

How does this circuit yields the output below? (Source: Guerrero FN, Spinelli EM, Haberman MA. Analysis and Simple Circuit Design of Double Differential EMG Active Electrode. IEEE Trans Biomed ...
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0answers
63 views

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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0answers
32 views

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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1answer
47 views

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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1answer
47 views

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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1answer
69 views

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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3answers
56 views

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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30 views

Measuring the impedance of dry EEG electrodes?

Does anyone have recommendations or good resources on measuring the impedance of active dry EEG electrodes? I'm working on a project to create my own electrodes, and I'm pretty new to the electronics ...
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2answers
220 views

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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1answer
55 views

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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0answers
165 views

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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2answers
424 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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72 views

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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2answers
136 views

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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2answers
192 views

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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0answers
477 views

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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1answer
120 views

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 ...
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2answers
245 views

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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33 views

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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1answer
110 views

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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1answer
30 views

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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1answer
95 views

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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2answers
2k views

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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1answer
101 views

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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0answers
47 views

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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0answers
71 views

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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1answer
181 views

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: ...