From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2002-01-14 20:58:43
Dear Michael:
There are two issues about safety. The medical use requires that the equipment have less than 10 micro amp leakage. That means that while you are hooked up with electrodes on you temples and grabbed a live 220 volt wire, the resulting current must be less than 10 micro amps. The medical testing also requires that you pass the 5000 volt HiPot test. The hobby use would not be as stringent, but why not be safe. The opto isolators that I was using with my brain monitor were only good for 3500 volts. By using a separate transmitter and receiver, 5 or 10 KV would not be a problem if you used batteries to power the input module. Joerg may have found a better isolatedDC/DC converter. The old one was only good to 1000 volts.
Does that answer your question?
Juergen P. (Jim) Meissner
Check out my Website at www.MeissnerResearch.com
Read about the benefits of the Brain State Synchronizer sounds for improving your life and health.
----- Original Message -----
From: michalchik_at_aol.com
To: buildcheapeeg_at_yahoogroups.com
Sent: Monday, January 14, 2002 2:48 PM
Subject: Re: [buildcheapeeg] Digest Number 277
In a message dated 1/14/2002 4:03:45 AM Pacific Standard Time, buildcheapeeg_at_yahoogroups.com writes:
Hi,
if you are referring to an IC with a led and a
photo-diode, the answer is yes. But there are safety
issues, so other solutions are also interesting.
I don't understand what safety issues you could have with an optical coupler because no electricity is actually transferred. Also correct me if I amwrong, but aren't you guys planning on using something like an isolation transformer? That would prevent any DC surges from getting through, but verysharp voltage spikes could generate voltage pulses that would get carried to the other side by the magnetic flux.
From:
Michael Michalchik:
Direct Replies to:
Michalchik@ urpantsaol.com
appreciated.
remove urpants to reply
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST