Investigating the right leg, RL, A or GND electrode in ECG, EEG and other biosignal measurements.

[@muratkancaoglu3284]

Biomedical PhD candidate here. Kinda best intro for RL drive. I was wondering it in real application and you did it here. You saved my time. Thank you and subscribed

[@naterodriguez9829]

wooaaa you've been doing a good job nice i'm biomedical engineer and it's nice to see this kind of stuff well done a keep it up and greetings from Colombia.

[@jjkim9233]

I really impressed by your efforts and passion to deliver sophisticated knowledge in a simple and real way! thank you so much!

[@smetanadvorak362]

This is amazing, please keep making these videos!

[@fvgm]

Thank you for your clear explanation! It is really useful

[@erdoganyildiz617]

Hello there, I am kind of confused at the end. Why does "two-electrode" EMG signal has more 50 Hz power line noise in it? Didn't we said that it actually has three electrodes as well since ground and the negative inputs are connected internally? So technically both channel 1 (ECG data) and channel 2 (EMG data) have 3 electrodes right? If so, I don't quite get what is the difference between first channel and second channel that causes one to cancel out the power line noise and other to not. I would be glad if anyone could help. Cheers. :)

[@almorawaka]

This is awesome explanation ! Keep it up ! great work..!

[@dimad5551]

Hey, I have question, if I want to record in lay down position, is it safety?

[@emc2928]

I found my new asmr channel❤️

[@batnibornongrum5845]

I want to know how to calculate heart beat

[@alhassanumar4450]

Thanks for the vid. Pls, are you using a wet or dry electrode? Where can I get some of those components you displayed?

[@BPMbiosignals]

check out biosignals.berndporr.me.uk

[@thilakg]

Can we put ground on other person?

[@jakekieserman1594]

If the grounding electrodes cancel out, why do amplifiers need a ground? Can you explain this?

[@BPMbiosignals]

Amplifiers need to measure against GND. There is no way to do that without it.

[@iliahadzhiev8023]

What about if I use single supply config. Do I connect ref voltage to negative input if i want 2 electrodes configuration.

[@BPMbiosignals]

Single supply config? You mean no negative power supply? ECGs have negative components so won't work. Either way it doesn't matter if you connect one electrode to GND or Ref. It's always a "ref" either to GND or ref voltage. What you get then is a simple non-inverting opamp circuit. GND to right arm. Non-inverting input to left foot. That won't cancel out 50Hz so you'd need a very good 50Hz mains filter. When using a wireless box (like the Attys) without a connection to mains GND that's not too bad when short circuiting GND and the neg input which is done for the 2nd channel in the Attys but needs a good digital notch filter to remove 50Hz. www.attys.tech/how-to/

[@kvmorg9434]

Some segments in the video are stamped not adjacent to each other

[@ytubeleo]

Is it a driven right leg or just neutral?

[@BPMbiosignals]

Neutral

[@ytubeleo]

Would you still be able to connect the two electrodes together if the "right leg" were driven?

[@BPMbiosignals]

@@ytubeleo Yes. The driven right leg is still basically "N" but injecting back a small amount the inverted amplifier output so it will still reduce 50Hz. However, the right leg drive is less and less used as it was an analogue means of reducing 50Hz noise and digital filters offer a cheaper way of doing so.

[@mahmudulhasan2922]

Love you

[@metalguy8117]

I need to marry this woman

[@TheTorito09]

me too