Small size low magnetic flux sensor probe - experience or borrow

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Rob Wilcox

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Jun 2, 2025, 8:36:21 PMJun 2

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Hello all,

I have an ocean of magnetic media containing audio to digitize. I have the equipment to do that for 1/4 inch audio and audio cassette, as well as some video formats.

I just bought a small tape head demagnetizer which runs on 120VAC 60Hz, presumably.

It is drawing 30mA. In the past these vibrated, this one does not.

So I would like to measure using a coil probe if it is producing a field.

A little research suggests it should be producing between 500-1000 Gauss. I know I can look up making a coil to sense the probe part which is about 3/8" wide. A number of turns dropped across a resistance measuring the voltage should do that.

Does anyone have a small coil probe with that ~1000 Gauss design point I can borrow, a source for them, or have you undertaken a similar problem?

This is what I'm trying to measure:

https://encrypted-tbn0.gstatic.com/shopping?q=tbn:ANd9GcR6e9DP_4bwykh7_qUOkaDjohfTmeOicR6r-TtVZtg8z1TqJXWDo_MXLKr3wJ1iI2U3bwwuG-EB7LBKwqwhXzuLRvKL-8GCR5wqsoWs9s8mh6t2W9XvGb41&usqp=CAc

This is also a good product:

https://encrypted-tbn2.gstatic.com/shopping?q=tbn:ANd9GcRgIIlWZ12G-T8VG_sRcrsyonrRUNS_jYFWvkNd-xdfC7HWm6DBxcIQQTbm3KWILxR3V75LCbvArFGi_BHcU_c5-begLZ9mNqj8H8Gzbl_qQE0qF79-TtiSYNM&usqp=CAc