Optimum placement of inductors in CLC filter

rwagter · 18th November 2002, 10:33 AM

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.

Ralph

rwagter · 18th November 2002, 12:21 PM

This is what I mean

Is this frequency wise a problem??

roddyama · 18th November 2002, 03:47 PM

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

Cambe · 18th November 2002, 08:41 PM

I agree.
Very nice indeed!
Sincerely,
Cambe

Nelson Pass · 18th November 2002, 09:59 PM

Yeah, just keep the front end on the other side of the amp.

18th November 2002, 10:33 AM	#1
rwagter diyAudio Member Join Date: Jul 2002 Location: Netherlands	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. Ralph

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18th November 2002, 03:47 PM	#3
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	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

18th November 2002, 08:41 PM	#4
Cambe diyAudio Member Join Date: Aug 2001 Location: USA,NorthCarolina	I agree. Very nice indeed! Sincerely, Cambe

18th November 2002, 09:59 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	Yeah, just keep the front end on the other side of the amp.

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