Questions tagged [eeg]
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35
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Mystery of the 50Hz artifact generated with a turned off smart plug and a laptop charger
Here some short background: I am a PhD student doing research in Neuroscience and I am using a 50Hz artifact generated by a laptop charger in my research for the synchronization of different ...
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86
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Why is there a shift in cutoff frequencies of filters, and how to fix it?
I am doing a project where I am designing my own EEG circuit. I aim to keep it fairly simple and essentially design my circuit to do two things:
Amplification
Filtering
I want to design the circuit (...
- 15
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111
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The op amp circuit doesn’t seem to work
I’m trying to make a crude EEG using two AD8428 op amps, each with a fixed gain of 2000.
The output doesn’t give me anything. I mean there is noise, but the noise remains even when there’s no power to ...
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How do the input current bias and the driven ground circuits in OpenBCI Ganglion work?
I am trying to understand how the OpenBCI Ganglion board works, but I can't figure out how these two sub-circuits work. I'm sorry I'm not too familiar with op-amps.
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Schematic Review: Interfacing ADS1299 with Seeed XAIO NRF52840 sense?
I need someone to review my schematic and guide me to fix the problems in the schematics.
Need help reviewing the schematics.
Can I power the ADS1299 with Seeed Xaio? If not, then how? I asked this ...
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118
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EEG instrumentation amplifier stage
I am trying to design an amplifier for EEG SIGNAL using INA 126(gain 6.5). I've included for you the attached schematic diagram. The simulation was working but When I tried to implement the circuit ...
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2
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262
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How does this EEG safety circuit work?
I'm trying to understand the following circuit, which I found in this document (on page 5). The purpose of the circuit is to go between a set of EEG electrodes and an EEG signal amplifier, and protect ...
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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 ...
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1
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103
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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 ...
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How does this EEG chip compare to modern EEG (is it still used now)? [closed]
I got from my drawer last night a vintage Brainmaster 2E I bought late 1990s that I used only a few times during that period. It has serial port at back.
My question concerns the gain of the amplifier ...
- 847
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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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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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279
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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 ...
- 91
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101
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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 ...
- 480
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3
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59
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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 ...
