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GB: Round #12; Fo-Felix AC Filter

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Destroyer OS

Destroyer OS

Member
Joined 2005
#1
Back due to demand! Again!

Please note that it can take a few months to get everything. Supply chain issues have made it take longer. Some have wanted different parts for that reason but the popular opinion still remains on preferring the very nice quality ones originally included.


5x20mm fuse option added for Euro buyers

So over the years people have asked about the old version, made by someone else.

It's probably time for an updated one. This one is a bit different. You may notice it does not have following capacitors after the choke. I have tried both ways, and my preference is without the following X2 capacitors. Also the capacitors prior to the choke are not varied in size because overall capacitance is more important - and they won't randomly resonate with each other.

The other major change is the addition of bypass resistors for the chokes. These don't ruin the filtration, but they do a good job of quieting the chokes that can get excited by different combinations of things on the mains.
Click to expand...

View attachment 1043981

Gen1 w/comoco's
IMG_1974_1_22.jpg


Here's how it is different in settling time from the original.
Fo_felix_vs_felix.png


Here's a comparison between resonances.
Fo_felix_vs_felix_resonance.png


*2oz copper PCB (1oz is standard)
*Weco 983ZD terminals, copper alloy and can accept 2 wires for daisy chain. These are also safer, particularly if you use solid core wire that otherwise likes to make cold solder joints you can't see.
*X2 rated capacitors for safety, 4x 0.47uf. They are alternated for CFC (capacitor field cancellation).
*Discharge resistor for X2 capacitors
Coilcraft Comoco choke w/fuse or Bourns 8120/8121-RC choke w/o fuse & 15/16A/20A() max sockets
*Fuse clips are beryllium copper 3AG & 5x20mm options
*120/230v operation (parts & pcb)
*Mounting holes are sized to work nicely with M3 screws and standoff kits
*Size: 2.25x4.25in
Click to expand...

The Weco 983ZD are preferred terminals, but not always available as individual sale. For this reason I'm going to include them in the price of PCB, so that I can meet min order requirements for them and save everyone the shipping.

Price: $14ea ($10 per filter board, $2 per Weco, 2 needed per board)

Shipping: $11 US, priority USPS box
$20 CAD
$22 General international padded envelope (prices may vary due to a crazy world)

If ordering over 4x boards there may be an additional $10, depending on destination.

Need 32 filter board commitments to order.

sebbtp 12
birdbox 6
danbmellow 4
MtlJazz 6
skunark 4
jedibones 6
clsidxxl 4
jam econo 4
ElliotA 12
utownsquash 6
ItsAllInMyHead 6
rickmcinnis 6
Click to expand...

​

 
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#4
I've always used an Isotek plus individual Belling Lee filters, but presumably starting with a bigger choke would improve things. Has anyone compared the Fo-Felix with smaller commercial options? (12 rounds is a lot to plough through: Thanks.)
 
#13
I'd have to open it up and look. Someone suggested in the power forum that it would be ok with sources and preamps as the current draw is low. With higher current draw it "may" be counterproductive. I guess I'll have to smoke it and see so to speak
 
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