Re: Weak Magnetic Field Sensing
- From: Robert Baer <robertbaer@xxxxxxxxxxxxx>
- Date: Sun, 05 Mar 2006 08:06:11 GMT
Christopher wrote:
Hello Everyone,*THANK YOU* very much for disclosing thje file size!!!!!
The mean ones have not chewed me out yet so what exactly am I trying
to accomplish?
Finding the best method using any type of sensor or effect for a
non-tactile, hand controlled volume attenuating circuit. I just need
to know what sensor would work best, I will design the support
circuit.
Ken Smith !!! I do have a "cow magnet" which is chrome and
about the size of my little finger, how did you ever guess that one? I
only learned of these this week.
***********
Weak Magnetic Field Sensing
Before I begin to chase the madness into the evening, I would like to
know if using a magnetic sensor like the Hall Effect would allow me to
convert "a small magnetic rod's distance into resistance. " The few
circuits sensing magnetism I see seem to be more of a window
comparator behavior or 0/1 or a tripped on state.
Ideal: is a strong "hand held" magnet moving 8" to 1" from the sensor,
this would create a resistance change of 10k down to 1k or something
to that effect not necessarily that resistance change.
Question: Is this conversion possible or unreasonable?
************
Explanation:
I am attempting to turn my "hand" into a human potentiometer with at
least an 8" sweep range. I thought holding a magnet could give me a
usable effect or force to do this.
I want to explore a new volume control method of a special musical
instrument called a "Theremin". The normal theremin volume method uses
a antenna and detects the shift in frequency of two perfectly balanced
oscillators. It has very wide physical sensing area of more than one a
foot diameter. Placing my hand out 12" then moving it next to the
control antenna quiets the volume without touching it.
Yes, I can do the above technique, along with an optical method and a
mechanical balance of two magnets opposing one another method which
works but is not responsive enough and is sloppy.
I want to use a different approach that will have a working width in
free space of about a 4" to 6" diameter and have detectable downward
sweep range starting at least 8" to the outside, then have a
controlled measurable output as my hand magnet moves down to the
control sensor pickup.
This will allow me to have more than one (maybe four) sensor/detector
spread out in the original one foot diameter or musical volume control
panel area of which my hand approaches.
Non of the above values or measurements are critical and could be
modified to adapt to the approach.
I have a webpage I show hobbyists/musicians how to build my theremin
design and this volume control method would be a great enhancement.
http://www.oldtemecula.com/theremin/
"The theremin is the only musical instrument played without touching
anything." It has can sound like a musical saw or an angels voice.
This is Clara Rockmore Circa 1940 .mp3 777kb
http://www.oldtemecula.com/theremin/sounds/cr-rachmaninoff_vocalise.mp3
Thank you, your ideas are greatly appreciated.
* * *
Christopher
Temecula CA.USA
http://www.oldtemecula.com
.
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