Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [eeg]

29 questions
2
votes
1 answer

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 amplifier with a gain around 1000. Sigma-Delta is…
moravas8051
  • 71
  • 3
2
votes
2 answers

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 cause EMI issues? The raw EEG signals are very…
z470
  • 121
  • 1
2
votes
1 answer

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 am curious about the connection, like where I…
Zahi Azmi
  • 149
  • 1
  • 9
2
votes
0 answers

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 international medical standards it's mandatory apply a…
thoraz
  • 389
  • 2
  • 13
1
vote
1 answer

Symmetric path for analog inputs into an ADC

I am designing a PCB based on the ADS1299 chip from TI, which is essentially an ADC with amps and some other functionalities. I have seen a lot of emphasis on differential inputs into an amplifier to be symmetrical, as in their path being…
NeuroEng
  • 462
  • 2
  • 13
1
vote
1 answer

What is the simplest EEG detecting circuit possible?

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 measuring mV scale EEG signals?
Rishi
  • 183
  • 1
  • 5
1
vote
1 answer

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 order of micro while ECG are much higher . On the…
user183710
  • 94
  • 7
1
vote
2 answers

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
  • 133
  • 7
1
vote
1 answer

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

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 able to read the data in real time. Unfortunately it…
user195672
  • 11
  • 2
1
vote
1 answer

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 EEGs carry weak EMG signals with it. My idea is…
Nathan Le
  • 11
  • 1
1
vote
1 answer

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: Gold and silver cup electrodes* Spider…
Hack-R
  • 133
  • 7
0
votes
0 answers

EEG signals does not give the negative point in microcontroller

I made my own EEG circuit, and have some problems. In the beginning, I did not come across this situation but, suddenly, I started to get these outputs, and I could not find the reason. When I upload my EEG ADC signals to MSP430 it was working like…
Merve Özdaş
  • 1
  • 2
0
votes
0 answers

How to measure skin-electrode impedence of dry eeg electrodes without an impedence analyzer?

I understand how to measure the impedance with an impedance analyzer, but I'm curious if it's possible to create a impedance measurement system on some kind of wearable with eeg electrodes. What's the engineering behind doing something like this?
Roshan
  • 177
  • 6
0
votes
1 answer

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 fit and adding normal wires and soldering them…
Mayur
  • 21
  • 4
0
votes
0 answers

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 all times. So imagine there are multiple points in…
Minu Bahrami
  • 1
1
2