Questions tagged [eeg]

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1answer
35 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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1answer
73 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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2answers
95 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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1answer
151 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 ...
2
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1answer
63 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 ...
1
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1answer
117 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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2answers
107 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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1answer
1k 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 ...
2
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0answers
80 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 ...
1
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1answer
183 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 ...
0
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1answer
119 views

Homemade EEG Circuit Common mode feedback

https://sites.google.com/site/chipstein/home-page/eeg-with-an-arduino/assembling-the-arduino-eeg-circult Hi, I am currently building a DIY EEG circuit using the guide above. This guide is for when ...
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2answers
229 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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0answers
102 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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1answer
70 views

University Project - Common Mode feedback in EEG systems

Basically 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 ...
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1answer
48 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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2answers
490 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 ...
1
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1answer
155 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: ...