From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2002-02-12 23:04:26
Dear Andreas:
You will likely be unplugging every session so you can put the probes on your head using the bathroom mirror or such.
I found that the RCA shielded connectors to work very well. That opens allsorts of easily available options. You can buy nice molded connector RCA shielded cables that are very durable. If you need more length, you can add a shielded female to female adaptor and on you go. I used four chassis mount RCA connectors coming out of the shielded input box. Radio Shack sells a cable that has 4 separate shielded wires molded together that makes it easy to handle. I cut the connectors off the other end and soldered the center conductor to the EEG probe and two of the shields to my body ground. I worked hard not to have more than 1/4 inch unshielded. I used a headbandand Velcro to hold the probes in place. For testing I built a little shielded box with a resistor attenuator for the calibration source.
> Since my last post, I've found a 9V NiMH battery so now one can use
> normal regulators (7805 and 7905), that are cheaper, easier to use
> and much more quiet (one order of magnitude less noise).
Sound great. The digital power may require a larger battery. We will see.
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: sleeper75se
To: buildcheapeeg_at_yahoogroups.com
Sent: Tuesday, February 12, 2002 4:36 PM
Subject: [buildcheapeeg] Re: Loose ends: Power and Connectors
--- In buildcheapeeg_at_yahoogroups.com, "Jim Meissner" <jpmeissner_at_mindspring.com> wrote:
> Dear Andreas:
>
> I believe your choice is an excellent one. The three batteries is
> a simple, foolproof and fast solution. The KISS principle.
Thanks. I'm after the "fast" aspect, to get this thing of the ground.
Since my last post, I've found a 9V NiMH battery so now one can use
normal regulators (7805 and 7905), that are cheaper, easier to use
and much more quiet (one order of magnitude less noise).
Moving from one thing to another:
What kind of connectors should I use? I'm thinking about a single 9
pin (for 4 bipolar channels) round connector of some sort because my
box is too small for 9 1-pin connectors. The electrodes must be
disconnected every so often and connected to the chloriding unit, so
the connector must be durable. Do you have any suggestions? There
are hundreds of connectors to choose from out there ...
DIN? IDC? XLR? (a bit too big), modular, 3.5mm telephone connectors?
(Could be dangerous :-) Any other
specialty/industrial/military/medical connector?
Regards,
Andreas
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:38 BST