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Old 18th November 2002, 10:33 AM   #1
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Default Optimum placement of inductors in CLC filter

I'm in the process of building the aleph5 and just read that placing inductors next to each other is not a very good idea because they influence each others magnetic field .

Since I want to use a CLC filtered PSU on a reasonable footprint how can I do this.

My PSU looks like this:

cccLccc +
cccLccc -

where c=10.000uF and L=3mH

For 2 channels this means I have 4 aircore inductors (not very small anymore). Is there an other way perhaps CRC (ossilation???) or C-NTC-C (like xa-200) which is more space efficient.

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Old 18th November 2002, 12:21 PM   #2
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This is what I mean

Is this frequency wise a problem??
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Old 18th November 2002, 03:47 PM   #3
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Hi Ralph,

It shouldn’t be a problem. After the first set of caps, your ripple currents will be relatively low anyway. But if you’re still worried about mutual inductance, place the coil axis 90 degrees to the adjacent coil. This will minimize the mutual coupling.

Frequency is not an issue here. You're dealing with noise and 120Hz (100Hz) ripple.

BTW, your 3D rendering looks pretty nice.
Rodd Yamashita
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Old 18th November 2002, 08:41 PM   #4
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I agree.
Very nice indeed!
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Old 18th November 2002, 09:59 PM   #5
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Yeah, just keep the front end on the other side of the amp.

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