Questions tagged [eeg]

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How do I connect a female EEG electrode to a breadboard?

Electrode output end: EEG electrode: I'm trying to connect the output of EEG electrodes to a breadboard as input. How do I connect the electrode to the breadboard? Usual jumper wires don't seem to ...
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Reference and bias electrodes required for single ended EEG signal AFE?

I am using ads1299 AFE for EEG signal acquisition. However there is something confusing. Do i need reference and bias electrodes if i need to aquire single ended signal from electrode? My application ...
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23 views

How to compute electric field between constantly changing potentials (LFP data)

I have a set of LFP (local field potential) data, which is basically the voltage of different points in the brain at different times. I would like to calculate the electric field at these points at ...
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92 views

Resistance of JFET when used as a voltage controlled resistor

We have designed a circuit for a bidirectional current limiter using an N-channel JFET as below: This limiter is connected to the end of electrode used for EEG measurement. The requirement for the ...
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1 answer
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Feeding a signal directly to an ADC or amplifying (active) it beforehand? [closed]

I am working on a project, where signals have the following characteristics (skip this if you are familiar with EEG): amplitude in 10's or 100's of microvolts frequency range: 1 to 100 Hz Low SNR ...
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  • 422
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3 answers
45 views

Recording sensory nerve action potentials at the skin surface without electrical stimulus

I studied many nerve conduction studies. In these studies, there is one stimulator that excites the nerve and there are electrodes placed at the skin surface on the path of the nerves to record the ...
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1 vote
1 answer
79 views

What is the simplest EEG detecting circuit possible? [closed]

Suppose I took an Arduino and hooked it up to two electrodes: one to the front part of my head going into A0 and another connecting my earlobe to ground, why wouldn't this system be capable of ...
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1 answer
170 views

How to measure a signal that uses a virtual ground using Arduino

I've created an EEG system that measures the potential difference between: 1) The differential amplification between EEG voltages. 2) a virtual ground between two 9V batteries. I'm trying to measure ...
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88 views

Do you need multiple instrumental amplifiers and filters for multichannel EEG systems?

I've created a 1 channel EEG using the AD620 instrumental amplifier and various active band filters. To add more channels, would I need one instrumental amp and series of filters per channel? or can I ...
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1 answer
54 views

Possible to measure EEG signals with an AM receiver antenna/circuit?

I'm having trouble understanding the importance of placing EEG electrodes directly on the skin. I used to think the reason for this was to pick up voltage differences between points on the skull, the ...
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2 votes
1 answer
205 views

ECG / EEG Amplifier design tricks

First of all, sorry, I missed the links / images where I have found the solutions mentioned below (I hope, if you are familiar with this topic, you know them): I have to design an ECG / EEG analog ...
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2 votes
2 answers
225 views

Will a 2.4GHz WiFI/Bluetooth antenna create noise in my sensitive EEG measurement circuit?

I'm designing a circuit for doing EEG measurements and I want it to be very compact. As a result, the WiFI+Bluetooth antenna (2.4GHz) will be sitting half an inch above the electrode inputs. Will this ...
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1 answer
1k views

Floating input in Op-amp Readout Circuit?

I was analyzing this circuit diagram in a thesis about a capacitive EEG electrode. The author talks about a flaw in the design where there is a "floating analogue input" that is causing the op-amp to ...
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2 votes
1 answer
104 views

Direct signal injection from function generator for EEG BCI calibration

I have seen several topics related to calibration of BCI and most of them use a "head phantom". But I want to know, is it possible to test the openBCI hardware directly using function generator? And I ...
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1 vote
1 answer
264 views

Can ECG electrodes be used for EEG detection?

Im having financial limitation for purchasing EEG monitoring modules or electrodes. But so is not the case for ECG. I am doubtful whether I can use ECG electrodes for EEG since brainwaves are in the ...
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1 vote
2 answers
186 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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1 answer
3k views

Is there any difference between AD620 vs INA128?

I'm trying to make an EMG sensor. I've found some tutorials, for example, DIY muscle sensor/EMG circuit for a microcontroller, but my main question is can I make an EMG sensor using AD620 instead of ...
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2 votes
0 answers
90 views

Whats the effect of a resistor inside the feedback of an active low-pass filter?

I'm working on the bias driver of an EEG system to remove the common mode signals from the channels. The output stage consists in a active inverting low-pass filter (I used an AD8606). Due to ...
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1 vote
1 answer
267 views

Stellate EEG Machine, would like to read the input in real-time, need to jury-rig it [closed]

I don't have an electrical engineering background but a neuroscience one, so apologies in advance for my poor knowledge. Basically I have an EEG machine (Stellate Harmonie) and I would like to be ...
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1 vote
1 answer
228 views

Homemade EEG circuit common mode feedback

I am currently building a DIY EEG circuit using this guide. This guide is for when there are two inputs. How can I modify this so that I can also input two EMG signals too? It is common knowledge that ...
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2 answers
320 views

Can Texas Instrument's INA332 really be used for EEG?

On TI's datasheet, it specifically lists EEG as one of INA332's potential uses. EEGs are microvolt level signals, and the INA332 has input offsets of +/- 2 milliVolts. 73db CMRR is quite low, but ...
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0 answers
152 views

Bang-for-buck in purchasing an instrumentation amplifier for three-electrode EEG recording?

While my forte has been in digital signal processing for most of my life, not-so-recently I've made the mistake of venturing into analog signal processing for a well-endowed client. I've primarily ...
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1 answer
90 views

Common Mode feedback in EEG systems

EEG signals (potential from brain) contain 'noise' due to EMG signals (potential from muscles). I was thinking of using the EMG as a common mode feedback prior to the amplification of the EEG signal. ...
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1 answer
61 views

SPICE - How model body for EMI in a EEG system

I was wondering how can I model the patient body in a EEG system to perform some simulation analisys. I started from this article which explains the coupling between the body and the EMI and the ...
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2 answers
666 views

Simple EEG circuit is not working

My simple EEG circuit is not working. For a simple test I built my EEG circuit on a breadboard and wanted to see if it works before adding filters and moving it to perfboard. I used an AD620AN and a ...
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1 vote
1 answer
202 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: ...
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