Olimex Support Forum

Others => Biofeedback - EEG, ECG, EKG => Topic started by: Axel on November 12, 2012, 08:37:14 AM

Title: EEG-SMT: Using 1 Channel only?
Post by: Axel on November 12, 2012, 08:37:14 AM
Hi,

I want to use 1 Channel only. Circuit diagram says, I should connect the unused channel inputs to V_REF. But, it is not easy to do this, is it?

Is it fine to connect to GND (ground, outer pin of plug), instead?

Best regards,
Axel
Title: Re: EEG-SMT: Using 1 Channel only?
Post by: Kris on November 12, 2012, 10:58:54 PM
Hi,

I want to use 1 Channel only. Circuit diagram says, I should connect the unused channel inputs to V_REF. But, it is not easy to do this, is it?

Is it fine to connect to GND (ground, outer pin of plug), instead?

Best regards,
Axel

I think you must connect the channel +/- to the drl, you can use a 3.5 splitter like these

http://www.amazon.com/3-5mm-Stereo-Female-Male-Adaptor/dp/B000I21Z4U/ref=sr_1_5?ie=UTF8&qid=1352753890&sr=8-5&keywords=3.5+splitter (http://www.amazon.com/3-5mm-Stereo-Female-Male-Adaptor/dp/B000I21Z4U/ref=sr_1_5?ie=UTF8&qid=1352753890&sr=8-5&keywords=3.5+splitter)
Title: Re: EEG-SMT: Using 1 Channel only?
Post by: Axel on November 13, 2012, 08:03:29 AM
Hi Kris,

thank you for your advise. The 3.5 splitter is a great idea, I didn't know that such a thing exists!

Axel