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GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom
GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom
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Old 19th May 2018, 07:29 PM   #1
Destroyer OS is offline Destroyer OS  United States
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GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom
Default GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom

The first round was gone almost in the snap of the fingers.

Quote:
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.
Round #2 won't need nylon washers on the top and bottom of the PCB (screws were violating the clearance too easily on R1).

Click the image to open in full size.

Gen1 w/comoco's
Click the image to open in full size.

Here's how it is different in settling time from the original.
Click the image to open in full size.

Here's a comparison between resonances.
Click the image to open in full size.

Quote:
*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
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.

**** For anyone with the originals that was not satisfied with having to use nylon washers (that I refunded $1 per board for to buy them) just tell me and I'll make a note to reserve them out of the printed lot, no need to commit to buying more****

Quote:
1MOR 5
pcgab 2
paulab 3
hkknudsen 3
tripped 2
Paul Hirst 6
Dhsettim 4
vanofmonks 2
AmpUtator 2
Audiogurujax 10
passive420 4
GhostMM 3

Last edited by Destroyer OS; 12th June 2018 at 10:37 PM.
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Old 21st May 2018, 11:50 PM   #2
AmpUtator is offline AmpUtator  United States
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Quote.

*Coilcraft Comoco choke w/fuse or Bourns 8120/8121-RC choke w/o fuse & 15/16A max sockets
In-Quote.


Destroyer OS:
I was just getting ready to order 15 or 17amp fuses for the Bourns 8120-RC coils. Why no fuses if using the Bourns?

Are you saying to jump the fuse on the boards if Bourns are being used?

What do you mean by 15/16A sockets?

Sorry, just want to make sure I understand correctly.

Last edited by AmpUtator; 21st May 2018 at 11:51 PM. Reason: Remove spaces
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Old 22nd May 2018, 01:38 AM   #3
pcgab is offline pcgab  United States
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GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom
Count me in for at least 2.
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Old 22nd May 2018, 02:35 AM   #4
Destroyer OS is offline Destroyer OS  United States
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GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom
Quote:
Originally Posted by AmpUtator View Post
Quote.

*Coilcraft Comoco choke w/fuse or Bourns 8120/8121-RC choke w/o fuse & 15/16A max sockets
In-Quote.


Destroyer OS:
I was just getting ready to order 15 or 17amp fuses for the Bourns 8120-RC coils. Why no fuses if using the Bourns?

Are you saying to jump the fuse on the boards if Bourns are being used?

What do you mean by 15/16A sockets?

Sorry, just want to make sure I understand correctly.
Because the Bourns are rated for the full capacity of the socket that feeds them. The Comoco's are fused because they'll melt if they are drawing too much current, and it's possible to do so without triggering the breaker. These decisions are based on people using them in "power strip" type situations, not within say an amplifier where you may choose to have a fuse that is accessible on the back (in which case it's your option if you have the understanding to modify your fo-felix, if you're using a different fuse holder)

All sockets with blades like this are 15A, and in the EU they go up to 16A (13A is common)

Click the image to open in full size.

Some people with custom romex lines may want to use the 8121 at 20A if they're using a 20A socket.

Last edited by Destroyer OS; 22nd May 2018 at 02:40 AM.
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Old 23rd May 2018, 01:49 PM   #5
AmpUtator is offline AmpUtator  United States
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Ha understood. Play on words, socket = outlet, same difference .
Check your PP.


Thanks.
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Old 23rd May 2018, 02:28 PM   #6
hkknudsen is offline hkknudsen
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Is anything gained from putting them in series, for example 8121 and the smallest one (well, several of them)? Or can the 8121 just as well be omitted then?
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Old 23rd May 2018, 05:01 PM   #7
Destroyer OS is offline Destroyer OS  United States
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GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom
Quote:
Originally Posted by hkknudsen View Post
Is anything gained from putting them in series, for example 8121 and the smallest one (well, several of them)? Or can the 8121 just as well be omitted then?
I suggest subjective testing on that. I've seen people put two in a row before. I believe one is a manufacturer. You're adding more inductance and more attenuating capacitance, but there may be some consequences to the complexity of the AC that might be audible but maybe not. You have to decide if it's simply "better".

You can do it technically, for sure.

Last edited by Destroyer OS; 23rd May 2018 at 05:14 PM.
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Old 23rd May 2018, 08:14 PM   #8
hkknudsen is offline hkknudsen
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Thanks, I will try and let know if I find out.... anything ;-)
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Old 24th May 2018, 12:57 PM   #9
tripped is offline tripped  United States
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@Destroyer OS sign me up for two boards please.
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Old 25th May 2018, 05:07 PM   #10
Paul Hirst is offline Paul Hirst  Canada
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Put me down for two please.

Paul
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