DRL demo

From: Joerg Hansmann (info_at_jhansmann.de)
Date: 2002-02-16 00:48:45

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Hi,

today I have built the DRL circuit into the comEEG prototype
and have done some tests:

EEG electrodes (pure silver) were attached with 10-20 paste
at Cz - Au2(with earclip),
DRL electrode was attached to right leg.

Sampling clock was 100Hz. I have doubled each value to simulate
200Hz sampling clock for the freeware EEG Editor (v1.0)
from www.NovaTechEEG.com . However due to the poor properties
of v1.0 I have decided to cut and paste the 1 second samples with
cooledit2000 and finally display the data with EXCEL.

To challenge the EEG amplifier a little bit, I have stepped
on an isolated 230V 50Hz power line during the recording.

Without DRL (1st second) 50Hz hum is predominant.
With DRL activated the 50Hz hum is apparently absent.

(The raw data of this experiment can be found in "DRL_demo.txt")

Regards,

Joerg

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