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I read the post below on the Honeywell sensors and printed out the PDF file that was linked. I then looked at the pdf from Allegro for their hall effect linear sensors and have a question for the group. The sensitivity for the Allegro A1321 is 5.000 mV/G with a noise floor of 40 mV (ouch!) and the the Honeywell's sensitivity is 3.2 mV/V/gauss with a resoulution of 27 ugauss. What's comfusing me is the differance of sensitivity parameters i.e. mV/G vs mV/V/gauss. Are they saying the same thing?
I realize of course that Hall Effect sensors are notorious for low sensitivity but there is a way to greatly increase the sensitivity by placing the sensor sideways in a slotted/flat soft iron ring with a magnet behind it (see Allegro's "Hall-effect IC Applications Guide"with the text on pg.24 right hand column and fig.53 on pg. 25). It would be nice if using this flat iron ring could bring it up enough to be used to locate the black sand deposits for alluvial gold bearing streams not to mention the cost thru Digi-key of under $2 per sensor.
Randy
I realize of course that Hall Effect sensors are notorious for low sensitivity but there is a way to greatly increase the sensitivity by placing the sensor sideways in a slotted/flat soft iron ring with a magnet behind it (see Allegro's "Hall-effect IC Applications Guide"with the text on pg.24 right hand column and fig.53 on pg. 25). It would be nice if using this flat iron ring could bring it up enough to be used to locate the black sand deposits for alluvial gold bearing streams not to mention the cost thru Digi-key of under $2 per sensor.
Randy