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Post by antigua on Dec 24, 2019 14:56:57 GMT -5
They do not. It's been said on the Internet "don't use soldering guns around guitar pickups", the idea being that if a soldering gun can demagnetize an old CRT monitor, it might also demagnetize a guitar pickup. But I did an test with an old Weller soldering gun with a rather chunky transformer in it. I held the side of the gun to the top of a Strat pickup while it was activated, for about thirty seconds, and found that the pole pieces didn't demagnetize. In practice, the soldering gun would never be this close to the pickups, and it wouldn't be active for that much time. Member yanyan was asking if it was true that a soldering gun could demagnetize a pickup. Of course, this could only apply to AlNiCo magnets, as ceramic magnets have a much higher coercivity. According this this site www.kjmagnetics.com/blog.asp?p=ceramic-remagnetization , it took a field of eight to ten thousand Gauss to magnetize a ceramic magnet, so it would take a similar strength to degauss it as well, which is achievable in between two neodymium magnets that are almost touching together. But even with AlNiCo and it's lower coercivity, a soldering gun doesn't produce a strong enough magnetic force to degauss the magnet. Even though the Gaussmeter shows precision in the 10's, the number bounces around a lot in real time, so the accuracy is more realistically about 5 milliteslas, but that being the case, the magnets appear to have lost no residual flux, even with the soldering gun directly over it, operating for about a total of 30 seconds. I hooked up a Fender Custom 54 neck pickup to an oscilloscope, and measured the voltage of the pickup at difference distances: The voltage output with the coil directly beside the pickup was 16 volts, which is about sixty times greater than the typical output of a Strat pickup.
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Deleted
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Post by Deleted on Dec 24, 2019 16:56:33 GMT -5
degauss
ELECTRONICS remove unwanted magnetism from (a television or monitor) in order to correct colour disturbance.
used to have items for cleaning up Tape Cassettes company i worked for made Tape Deck Recorders mainly for the Churches in the USA and we used them machines to clean up watch makers use a smaller machine too
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yanyan
Meter Reader 1st Class
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Post by yanyan on Dec 25, 2019 12:06:13 GMT -5
Thank you for this antigua, awesome work as always. I am surprised by your findings because i was pretty much expecting the alnico to degauss. On the other hand i am reassured that my ceramics are okay, and that even alnico pickups will be okay after exposure to a soldering gun. If i come across other online posts about degaussing guitar pickups with a soldering gun i'll be sure to link to this thread. Just curious: did you happen to get the gauss of the gun's magnetic field? Please enlighten me: the oscilloscope traces show the voltage generated by coil excitation caused by having the soldering gun near the pickups, right? Thanks again.
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Post by antigua on Dec 26, 2019 16:37:54 GMT -5
Just curious: did you happen to get the gauss of the gun's magnetic field? Please enlighten me: the oscilloscope traces show the voltage generated by coil excitation caused by having the soldering gun near the pickups, right? The magnetic field from the coil rapidly oscillates positive and negative at 60Hz, so the Gaussmeter can't provide a Gauss reading. A DC voltage would produce a standing magnetic field that could be measured. That's why I recorded the voltage the soldering gun produced in the pickup, as a next best alternative. With some complicated math, it might be possible to determine the intensity of the magnetic field using the data points and some estimations, but I'm not strong on that math.
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Post by stratotarts on Dec 26, 2019 19:04:48 GMT -5
Apart from that, I think that there are other reasons for using a different kind of soldering tool. These guns have very poor temperature regulation, tending to run hot. This often creates excessive oxidation on the tip, which makes it difficult to maintain a clean tip, and also contributes to improper flux activation at the target join. The low mass of the tip also allows the temperature to drop rapidly when touching a larger join, which can only be counteracted with more "juice" at the trigger. That makes it harder to control. Altogether, it means that it's not really well suited to finer electronics work.
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