PSN-L Email List Message

Subject: Hello Chris
From: "Geoffrey" gmvoeth@...........
Date: Sat, 27 Feb 2010 07:01:56 -0700

Hello Chris,

two hours to Hawaii tsunami time (HTT).

I have Always Heard that semiconductors
are current devices where vacuum tubes are
voltage devices.

If this is true wouldn't one large conductor
like a bar of copper be better in
a magnetic field creating a flow
of current than many turns of
small high resistance wires ?

I have seen an aluminum bar stopped
dead in its tracks from a fall of
maybe two feet by a very strong
magnetic field.

There must have been many amps of current
induced in the rod to stop that momentum.


----- Original Message ----- 
Sent: Monday, February 22, 2010 6:18 AM
Subject: Re: Velocity Sensor Designed Specifiically for diff input - Wire

> In a message dated 22/02/2010, gmvoeth@........... writes:
> Would it  be possible to use a
> single massive (ideal) wire like 1/4 inch
> in  diameter with a magnet then
> increase the voltage to be sensed
> simply  narrow the wire gradually
> to like 30 AWG wire in a current loop
> to act  as a concentrator to boost the voltage ?
> Sort of like water through a  pipe
> which narrows suddenly ?
> Is this silly  ?
> Hi Geoff,
>    Sorry, but this won't work. The analogy is not  correct. You need a lot 
> of turns N to generate a larger voltage = N x the flux  change.
>    Regards,
>    Chris Chapman

Mail Returned: ????
Received: from ( [])
by (Internet Inbound) with ESMTP id 7F7A3380000A8
for ; Sat, 27 Feb 2010 08:55:09 -0500 (EST)
Received: from BLU0-SMTP74 ([]) by with Microsoft SMTPSVC(6.0.3790.3959);
Sat, 27 Feb 2010 05:55:09 -0800
X-Originating-IP: []
X-Originating-Email: [gmvoeth@............
Received: from USA ([]) by over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959);
Sat, 27 Feb 2010 05:55:08 -0800
Reply-To: "Geoffrey" 
From: "Geoffrey" 
References: <34b2.1a3a416f.38b3de36@.......>
In-Reply-To: <34b2.1a3a416f.38b3de36@.......>
Subject: Re: Velocity Sensor Designed Specifiically for diff input - Wire
Date: Sat, 27 Feb 2010 06:54:26 -0700
MIME-Version: 1.0
Content-Type: text/plain;
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Windows Mail 6.0.6002.18005
X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18005
X-OriginalArrivalTime: 27 Feb 2010 13:55:08.0946 (UTC) FILETIME=[793C1F20:01CAB7B4]
x-aol-global-disposition: G
X-AOL-SCOLL-SCORE: 0:2:463578400:93952408  
x-aol-sid: 3039ac1d400a4b89243d18fa


Public Seismic Network Mailing List (PSN-L)

[ Top ] [ Back ] [ Home Page ]