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GB: Round #5; Fo-Felix AC Filter

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Destroyer OS

Destroyer OS

Member
Joined 2005
#1
**We're on round #5!!!**


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 strongly 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...


Fo_Felix_R2_Public_preview2.png


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 (good for 30A)
*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: $13ea ($9 per filter board same as original, $2 per Weco, 2 needed per board)

Shipping: $8 US, priority USPS box
$15 CAD
$16 General international padded envelope
If ordering over 4x boards there may be an additional $10, depending on destination.

Need 32 filter board commitments to order.

C 5x
wealas 6x
Danny23 12x
wmchugh 6x
tommylck 8x
astromo 6x
Dadbeh 4x
mirek84 6x
ravid 2x
Click to expand...
 
Last edited:
#15
Comoco's all have lower amperes because they're a combination differential and common mode noise filter. The smallest 3A one really filters well, the 5A is decent, and the 10A isn't much of an advantage over the Bourns because it's lower common mode noise filtration and not huge on differential. My preference is in general all Comoco 3A and 17A Bourns. But if you have some weird stuff that draws a fair bit of power like a pump for an air bearing maybe, that needs more than 3A, then a 5A Comoco starts to look smart.
 
#17
Connectors arrive today, so I can get all of them out within the week. It's slightly annoying to have to wait on the supply of them since they're non-stocked, but they're available from the manufacturer's own supply, so I'm not going to get too upset! The last one had zero availability so it took even a bit longer because we had to wait on them being made in a cycle of production.

There are boards for anyone who didn't make the initial sign up.
 
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