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Does the inductor magnetic field effect the nearby components??
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Adhith:
Hello everyone...
I'm using a pi type filter using 470MH inductor and two1000mf caps on both side. However this circuit is placed near an amplifier board within my project enclosure. So my question is, Since the energy in inductor is store in form of magnetic field does this magnetic field has any effect on the near by components in the amplifier board or its totally safe to place the inductor near it??
Adhith:

--- Quote from: blueskull on July 24, 2018, 07:42:35 am ---you can use shielded magnetic cores to reduce leakage, then use shielding cans on your sensitive parts to further attenuate magnetic noise.

--- End quote ---
Thank you very much Sir for your help. I'm using a Small Toroidal inductor for the purpose. The components near to the inductor are some resistors and if I'm planning to shield the inductor then what could the possible material for it?? Do tapes work?? right now I have some insulation tapes, pvc tapes, kepton tapes and also have some thin glass fibre sheets too.
HB9EVI:
you have to use conductive material for shielding, plastic whatsoever won't do the job. there special shielding boxes which are solderable - but just this alone won't do it either; you have to lay out the pcb appropriatelly for good shielding results; just packing a toroid in a shielding box will not do it
FlyingHacker:
The type of inductor will also have an effect on the amount of adjacent component interference. Torroids generally keep their fields more contained. You often want to put the inductors at right angles to each other as well. The ARRL Handbook covers these topics quite a bit, as many radio and amplifiers contain these larger components.

Even adjacent traces can cause mutual inductance.

https://www.electronics-tutorials.ws/inductor/mutual-inductance.html

https://pdfserv.maximintegrated.com/en/an/AN4636.pdf

schmitt trigger:
There are several core forms specifically designed for low field radiation. Pot cores and toroids immediately come to mind.

So by choosing a toroid, you have correctly selected a good core shape.

A simple trick to visualize stray fields is to obtain very fine iron powder. On you inductor under test, apply the rated DC current with the aid of a laboratory supply.
Place the inductor on the iron powder. Any material that sticks to it are because of stray fields.
De energize the core in a separate area, and weigh the amount of iron powder that was attracted to it.

Then compare a different core.

This is only a qualitative test, but can help you visualize the relative amount of stray fields. For EI-cores, it is surprising the amount of material which is attracted to the gap.
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